
<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
	<id>https://proteopedia.org/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=Anders+Lewisesquerre</id>
	<title>Proteopedia - User contributions [en]</title>
	<link rel="self" type="application/atom+xml" href="https://proteopedia.org/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=Anders+Lewisesquerre"/>
	<link rel="alternate" type="text/html" href="https://proteopedia.org/Special:Contributions/Anders_Lewisesquerre"/>
	<updated>2026-09-18T08:27:29Z</updated>
	<subtitle>User contributions</subtitle>
	<generator>MediaWiki 1.43.8</generator>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334852</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334852"/>
		<updated>2025-05-05T13:49:41Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]&lt;br /&gt;
&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
[[Image:AMS-11-26363-g003.jpg]]&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334851</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334851"/>
		<updated>2025-05-05T13:49:21Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]&lt;br /&gt;
&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
[[Image:AMS-11-26363-g003.jpg]]&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;/td&amp;gt;&amp;lt;/tr&amp;gt;&amp;lt;tr id=&#039;method&#039;&amp;gt;&amp;lt;td class=&amp;quot;sblockLbl&amp;quot;&amp;gt;&amp;lt;b&amp;gt;[[Empirical_models|Method:]]&amp;lt;/b&amp;gt;&amp;lt;/td&amp;gt;&amp;lt;td class=&amp;quot;sblockDat&amp;quot; id=&amp;quot;methodDat&amp;quot;&amp;gt;X-ray diffraction, [[Resolution|Resolution]] 2.75&amp;amp;#8491;&amp;lt;/td&amp;gt;&amp;lt;/tr&amp;gt;&lt;br /&gt;
&amp;lt;table&amp;gt;&amp;lt;tr&amp;gt;&amp;lt;td colspan=&#039;2&#039;&amp;gt;[[1b8m]]&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334849</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334849"/>
		<updated>2025-05-05T13:47:51Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]&lt;br /&gt;
&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
[[Image:AMS-11-26363-g003.jpg]]&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;table&amp;gt;&amp;lt;tr&amp;gt;&amp;lt;td colspan=&#039;2&#039;&amp;gt;[[1b8m]]&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334784</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334784"/>
		<updated>2025-05-03T23:21:05Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]&lt;br /&gt;
&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
[[Image:AMS-11-26363-g003.jpg]]&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=File:AMS-11-26363-g003.jpg&amp;diff=4334783</id>
		<title>File:AMS-11-26363-g003.jpg</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=File:AMS-11-26363-g003.jpg&amp;diff=4334783"/>
		<updated>2025-05-03T23:20:12Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334782</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334782"/>
		<updated>2025-05-03T23:19:12Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]&lt;br /&gt;
&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334781</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334781"/>
		<updated>2025-05-03T23:17:10Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334780</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334780"/>
		<updated>2025-05-03T23:15:57Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
[[Image:BDNF_TGN_1.jpg]]BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=1&amp;diff=4334779</id>
		<title>1</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=1&amp;diff=4334779"/>
		<updated>2025-05-03T23:13:45Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: New page: ==Your Heading Here (maybe something like &amp;#039;Structure&amp;#039;)== &amp;lt;StructureSection load=&amp;#039;1stp&amp;#039; size=&amp;#039;340&amp;#039; side=&amp;#039;right&amp;#039; caption=&amp;#039;Caption for this structure&amp;#039; scene=&amp;#039;&amp;#039;&amp;gt; This is a default text for you...&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;==Your Heading Here (maybe something like &#039;Structure&#039;)==&lt;br /&gt;
&amp;lt;StructureSection load=&#039;1stp&#039; size=&#039;340&#039; side=&#039;right&#039; caption=&#039;Caption for this structure&#039; scene=&#039;&#039;&amp;gt;&lt;br /&gt;
This is a default text for your page &#039;&#039;&#039;1&#039;&#039;&#039;. Click above on &#039;&#039;&#039;edit this page&#039;&#039;&#039; to modify. Be careful with the &amp;amp;lt; and &amp;amp;gt; signs.&lt;br /&gt;
You may include any references to papers as in: the use of JSmol in Proteopedia &amp;lt;ref&amp;gt;DOI 10.1002/ijch.201300024&amp;lt;/ref&amp;gt; or to the article describing Jmol &amp;lt;ref&amp;gt;PMID:21638687&amp;lt;/ref&amp;gt; to the rescue.&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
== Relevance ==&lt;br /&gt;
&lt;br /&gt;
== Structural highlights ==&lt;br /&gt;
&lt;br /&gt;
This is a sample scene created with SAT to &amp;lt;scene name=&amp;quot;/12/3456/Sample/1&amp;quot;&amp;gt;color&amp;lt;/scene&amp;gt; by Group, and another to make &amp;lt;scene name=&amp;quot;/12/3456/Sample/2&amp;quot;&amp;gt;a transparent representation&amp;lt;/scene&amp;gt; of the protein. You can make your own scenes on SAT starting from scratch or loading and editing one of these sample scenes.&lt;br /&gt;
&lt;br /&gt;
&amp;lt;/StructureSection&amp;gt;&lt;br /&gt;
== References ==&lt;br /&gt;
&amp;lt;references/&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=File:BDNF_TGN_1.jpg&amp;diff=4334778</id>
		<title>File:BDNF TGN 1.jpg</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=File:BDNF_TGN_1.jpg&amp;diff=4334778"/>
		<updated>2025-05-03T23:13:32Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334777</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4334777"/>
		<updated>2025-05-03T23:13:11Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5].&lt;br /&gt;
BDNF is synthesized in the Endoplasmic reticulum as a 32-35 kDa precursor (pro BDNF). This precursor is processed in the golgi-apparaturs and its terminal domain is cleaved by a convertase, the mature BDNF protein is then passed through the trans-golgi network and secreted by secretory vesicles out of the plasma membrane[[1]]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332442</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332442"/>
		<updated>2025-04-29T14:05:00Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates folding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in Parkinson&#039;s. Huntington&#039;s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Huntington&#039;s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically through increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signaling pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332439</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332439"/>
		<updated>2025-04-29T14:00:02Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5) [https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates flding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332438</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332438"/>
		<updated>2025-04-29T13:59:45Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
[https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates flding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332437</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332437"/>
		<updated>2025-04-29T13:59:32Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) &lt;br /&gt;
 [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates flding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332351</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332351"/>
		<updated>2025-04-29T02:48:07Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_binding_close/1&#039;&amp;gt;interaction&amp;lt;/scene&amp;gt; with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier, as well as flexible regions on the outer regions of neurotrophin-4/5 (although these regions are absent in BDNF. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that creates flding necessary for binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332345</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332345"/>
		<updated>2025-04-29T02:39:29Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct interaction with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The &amp;lt;scene name=&#039;10/1078788/BDNF_consurf/1&#039;&amp;gt;Analysis results&amp;lt;/scene&amp;gt; identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=File:1B8M_consurf_pymol_session.pse&amp;diff=4332341</id>
		<title>File:1B8M consurf pymol session.pse</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=File:1B8M_consurf_pymol_session.pse&amp;diff=4332341"/>
		<updated>2025-04-29T02:36:41Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332338</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332338"/>
		<updated>2025-04-29T02:35:45Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct interaction with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The analysis results identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;br /&gt;
&lt;br /&gt;
== References ==&lt;br /&gt;
&lt;br /&gt;
Bathina, Siresha, and Undurti N Das. “Brain-derived neurotrophic factor and its clinical implications.” Archives of medical science : AMS vol. 11,6 (2015): 1164-78. doi:10.5114/aoms.2015.56342&lt;br /&gt;
&lt;br /&gt;
https://www.uniprot.org/uniprotkb/P23560/entry&lt;br /&gt;
&lt;br /&gt;
https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00363/full&lt;br /&gt;
&lt;br /&gt;
https://onlinelibrary.wiley.com/doi/10.1110/ps.8.12.2589&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Skaper S. D. (2012). The neurotrophin family of neurotrophic factors: an overview. Methods in molecular biology (Clifton, N.J.), 846, 1–12. https://doi.org/10.1007/978-1-61779-536-7_1&lt;br /&gt;
&lt;br /&gt;
Ibrahim, Abdallah Mohammad et al. “Brain-Derived Neurotropic Factor in Neurodegenerative Disorders.” Biomedicines vol. 10,5 1143. 16 May. 2022, doi:10.3390/biomedicines10051143&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332337</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332337"/>
		<updated>2025-04-29T02:33:42Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct interaction with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt; in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The analysis results identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332336</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332336"/>
		<updated>2025-04-29T02:33:20Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct interaction with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable &amp;lt;scene name=&#039;10/1078788/Bdnf_beta_turns_and_disorder/1&#039;&amp;gt;flexible regions&amp;lt;/scene&amp;gt;in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The analysis results identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332322</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332322"/>
		<updated>2025-04-29T02:21:02Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct interaction with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, &amp;lt;scene name=&#039;10/1078788/Bdnf_residues_22-26/1&#039;&amp;gt;single alpha helical turn&amp;lt;/scene&amp;gt; from amino acid residues 22-26. There are also notable flexible regions in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The analysis results identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332316</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332316"/>
		<updated>2025-04-29T02:10:56Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&lt;br /&gt;
== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
----&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [https://www.rcsb.org/structure/6XUO PDB structure], neurotrophin-3 (NT-3) [https://www.rcsb.org/structure/1B8K PDB structure], and neurotrophin-4/5 (NT-4/5)[https://www.rcsb.org/structure/1B98 PDB structure of neurotrophin-4/5]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB). A &amp;lt;scene name=&#039;10/1078788/Nt-45_and_trkb_interaction/1&#039;&amp;gt;complex&amp;lt;/scene&amp;gt; between a closely related neurotrophin (neurotrophin-4/5), was revealed via x-ray diffraction. Analysis of this interaction shows that key regions of the protein involved in direct interaction with the receptor lie within the long, 𝛽-sheet regions of the protein as mentioned earlier. Receptor binding causes autophosphorylation of tyrosine residues and results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, single alpha helical turn from amino acid residues 22-26. There are also notable flexible regions in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The analysis results identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
[https://consurf.tau.ac.il/consurf_index.php ConSurf]&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332301</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332301"/>
		<updated>2025-04-29T01:39:03Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. The protein is composed mostly of 𝛽-sheets, with the exception of the small, single alpha helical turn from amino acid residues 22-26. There are also notable flexible regions in the protein that consist of 𝛽-turns, and intrinsically disordered regions (IDRs). A ConSurf-DB analysis was done on BDNF to identify conserved sequences on the protein. The analysis results identified residues running along the long middle portions of 𝛽-sheets. This may provide insight into regions of BDNF receptor binding, where the less conserved regions may vary from species to species due to the differing physiology of such species. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332290</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332290"/>
		<updated>2025-04-29T00:52:38Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Lower BDNF levels are seen in patients with Multiple Sclerosis (MS), Parkinson&#039;s disease, and Alzheimer&#039;s disease, which highlights the consequence that lower amounts of BDNF contribute to the cognitive decline seen in Alzheimer’s, and dopaminergic neuron degeneration seen in parkinsons. Hungtinton’s disease, which is caused by a mutation in the huntingtin gene, produces a mutated huntingtin protein that disrupts BDNF axonal transport and transcription. Because striatal neurons heavily rely on cortically derived BDNF for survival and function, this disruption leads to the degeneration of striatal neurons, a key pathological feature of Hungtington’s disease. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways. &lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332289</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332289"/>
		<updated>2025-04-29T00:52:02Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Val66Met polymorphism ==&lt;br /&gt;
A single nucleotide polymorphism has gained attention that involves a polymorphism at codon 66 in the BDNF gene that results in a point mutation swapping a valine for a methionine. While the mutation change does not make it into the final processed mature BDNF protein, it is known to induce impacts on the processing, transport, and potentially folding of the protein. Individuals with the met allele, especially homozygotes, have measurable effects on brain function caused by a decrease in the availability of BDNF at synapses as a result of the mutation. Individuals with this mutation may have decreased hippocampal volume and show symptoms of memory impairment.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332269</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332269"/>
		<updated>2025-04-28T23:55:26Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332268</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332268"/>
		<updated>2025-04-28T23:55:04Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;BDNF&amp;lt;/scene&amp;gt;&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332267</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332267"/>
		<updated>2025-04-28T23:54:10Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
BDNF&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332265</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332265"/>
		<updated>2025-04-28T23:52:33Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332263</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332263"/>
		<updated>2025-04-28T23:50:25Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/c-jun N-terminal kinase/1&#039;&amp;gt;c-jun N-terminal kinase&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332261</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332261"/>
		<updated>2025-04-28T23:49:39Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/c-jun N-terminal kinase/1&#039;&amp;gt;JNK&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
The &#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
In the &#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;,&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
The third cascade is the &#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;, where&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332259</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332259"/>
		<updated>2025-04-28T23:47:54Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
Effects of the mammalian neurotrophin family of proteins are accomplished through activation of the tropomyosin-related kinase receptor family (TrkA, TrkB, and TrkC), and the p75 neurotrophin receptor, which is a member of the tumor necrosis factor receptor superfamily. Binding to the p75 neurotrophin receptor leads to neurite outgrowth via Trk modulation, and activation of &amp;lt;scene name=&#039;10/1078788/c-jun N-terminal kinase/1&#039;&amp;gt;JNK&amp;lt;/scene&amp;gt; (JNK), which leads to apoptosis. As a reference, the complex formed upon binding of Nerve growth factor (NGF) – a neurotrophin with close structural homology to BDNF – to the p75 receptor is &amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;, where NGF is shown in lime, and the p75 receptor is shown in fuchsia. BDNF binds to &amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;tropomyosin receptor kinase B&amp;lt;/scene&amp;gt; (TrkB), which results in activation of three different signaling cascades. These signaling pathways cause activation of CREB and CREB-binding protein (CBP), transcription factors which regulate expression of genes involved in neural plasticity, cell survival, and stress resistance.  &lt;br /&gt;
&#039;&#039;&#039;IRS-1/PI3K/AKT pathway&#039;&#039;&#039;&lt;br /&gt;
Involves sequential activation of Insulin receptor substrate 1 (IRS1/2), phosphatidylinositol-3-kinase (PI3K), and protein kinase B (Akt). The pathway activates protein kinase A (Akt) which suppresses apoptosis&lt;br /&gt;
&#039;&#039;&#039;Ras/MAPK/ERK pathway&#039;&#039;&#039;&lt;br /&gt;
Ras activates the Ras/MAPK/ERK pathway, as well as the PIK3, and PLC pathways. MAPK/ERK promotes cell survival by induction of pro survival genes and inhibition of pro-apoptotic proteins&lt;br /&gt;
&#039;&#039;&#039;PLC/DAG/IP3 pathway&#039;&#039;&#039;&lt;br /&gt;
PLC-𝛾 is phosphorylated by BDNF binding to the TrkB receptor, leading to production of IP3 and DAG. IP3 increases intracellular calcium concentrations, and DAG regulates protein kinase C, which is important in the MAPK/ERK pathway.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt; is a 13kDa protein that belongs to the nerve growth factor (NGF) family. In a broader sense, BDNF is part of the cystine-knot cytokine superfamily. A cystine-knot is a structural motif characterized by three intertwined disulfide bonds that form a knot. This &amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;, which has three disulfide bonds and is likely a key structural feature that allows binding to the TrkB receptor. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332178</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332178"/>
		<updated>2025-04-28T19:07:30Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;JNK&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Structure ==&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332177</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332177"/>
		<updated>2025-04-28T19:06:49Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;JNK&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
Implicated in multiple neurodegenerative diseases due to its apparent neuroprotective effects, ability to promote neurogenesis, and improve synaptic plasticity. Diseases include parkinson’s disease, Huntington&#039;s disease, multiple sclerosis, Alzheimer&#039;s disease, dementia, and possibly schizophrenia. BDNF is also associated with type-2 diabetes mellitus by its regulation of energy metabolism, specifically increasing the amount of insulin secreting granules in pancreatic 𝛃 cells through TrkB signal pathways.&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332176</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332176"/>
		<updated>2025-04-28T19:05:55Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is a 13kDa signaling protein belonging to the neurotrophin family of growth factors. This family of growth factors are critical in the development, differentiation, and survival of neurons. Mammalian members of the neurotrophin family of growth factors include Nerve growth factor (NGF) [structure link], neurotrophin-3 (NT-3) [structure link], and neurotrophin-4/5 (NT-4/5)[structure link]. BDNF is primarily expressed in the brain, where it is found in the hippocampus, cortex, amygdala, and striatum, and less so in the hypothalamus. BDNF is also expressed in peripheral tissues, such as the kidneys, retina, prostate, motor neurons, skeletal muscle.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
Brain-derived neurotrophic factor (BDNF) is involved in the growth, differentiation, and survival of neurons in the central, and peripheral nervous systems. It plays a role in neural plasticity, neurogenesis, energy metabolism, inflammation and immunity, neurotransmitter regulation, and potential roles in the cardiovascular system. The role of BDNF in neural plasticity is shown in its ability to regulate NDMA receptor signaling by increasing calcium influx and more BDNF release, which by retrograde signaling, enhances pre-synaptic vesicle cycling, thereby regulating long-term potentiation (LTP), and plasticity.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;JNK&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332104</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332104"/>
		<updated>2025-04-28T17:39:22Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Jnk/1&#039;&amp;gt;JNK&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332091</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332091"/>
		<updated>2025-04-28T17:32:22Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/2&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332088</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332088"/>
		<updated>2025-04-28T17:29:41Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Ngf_and_p75_receptor/1&#039;&amp;gt;shown&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332035</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332035"/>
		<updated>2025-04-28T16:15:28Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Bdnf_disulfide_bonds_2/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt;&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332026</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4332026"/>
		<updated>2025-04-28T16:01:21Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/Trkb_receptor/2&#039;&amp;gt;TrkB receptor&amp;lt;/scene&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/BDNF_cystine_knot_1/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt; &lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331975</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331975"/>
		<updated>2025-04-28T14:56:03Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;AF-W8VY28-F1-model_v4.pdb&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of TrkB&#039; scene=&#039;10/1078788/Trkb_receptor/1&#039; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;scene name=&#039;10/1078788/BDNF_cystine_knot_1/1&#039;&amp;gt;Cystine knot&amp;lt;/scene&amp;gt; &lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331947</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331947"/>
		<updated>2025-04-28T13:57:09Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;AF-W8VY28-F1-model_v4.pdb&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of TrkB&#039; scene=&#039;10/1078788/Trkb_receptor/1&#039; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;BDNF_1.pse&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;BDNF structure highlights&#039; scene=&#039;Insert optional scene name here&#039; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=File:BDNF_1.pse&amp;diff=4331945</id>
		<title>File:BDNF 1.pse</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=File:BDNF_1.pse&amp;diff=4331945"/>
		<updated>2025-04-28T13:53:58Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331467</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331467"/>
		<updated>2025-04-26T18:51:18Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;AF-W8VY28-F1-model_v4.pdb&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of TrkB&#039; scene=&#039;10/1078788/Trkb_receptor/1&#039; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331466</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331466"/>
		<updated>2025-04-26T18:46:18Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;AF-W8VY28-F1-model_v4.pdb&#039; size=&#039;300&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of TrkB&#039; scene=&#039;Insert optional scene name here&#039; /&amp;gt;&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=File:AF-W8VY28-F1-model_v4.pdb&amp;diff=4331465</id>
		<title>File:AF-W8VY28-F1-model v4.pdb</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=File:AF-W8VY28-F1-model_v4.pdb&amp;diff=4331465"/>
		<updated>2025-04-26T18:44:08Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331462</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331462"/>
		<updated>2025-04-26T18:15:30Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Introduction ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Function ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Mechanism ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Structure ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Disease ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Evolution ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
== Additional resources ==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331446</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331446"/>
		<updated>2025-04-26T17:35:54Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&#039;&#039;&#039;Function&#039;&#039;&#039;&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; scene=&#039;10/1078788/Bdnf/1&#039; /&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
	<entry>
		<id>https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331444</id>
		<title>User talk:Anders Lewisesquerre</title>
		<link rel="alternate" type="text/html" href="https://proteopedia.org/index.php?title=User_talk:Anders_Lewisesquerre&amp;diff=4331444"/>
		<updated>2025-04-26T17:33:50Z</updated>

		<summary type="html">&lt;p&gt;Anders Lewisesquerre: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;== Brain-derived neurotrophic factor (BDNF) ==&lt;br /&gt;
&lt;br /&gt;
&#039;&#039;&#039;Function&#039;&#039;&#039;&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&amp;lt;Structure load=&#039;1b8m&#039; size=&#039;350&#039; frame=&#039;true&#039; align=&#039;right&#039; caption=&#039;Structure of BDNF&#039; &amp;lt;scene name=&#039;10/1078788/Bdnf/1&#039;&amp;gt;Text To Be Displayed&amp;lt;/scene&amp;gt;&lt;/div&gt;</summary>
		<author><name>Anders Lewisesquerre</name></author>
	</entry>
</feed>