Sandbox Reserved 1100: Difference between revisions
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The organisation of the structure of the Adiponectin receptor 1 is the opposite to [[G protein-coupled receptor]] family. Indeed, the Adiponectin receptor has an internal <scene name='82/829353/N-terminus_domain/2'>N-terminus domain</scene> and an external <scene name='82/829353/C-terminus_domain/3'>C-terminus domain</scene> while the G-protein family has an internal N-terminus domain and an external C-terminus domain. <ref name="doc3"> Takashi Kadowaki and Toshimasa Yamauchi et al. « Adiponectin and adiponectin receptors». 2015 https://www.ncbi.nlm.nih.gov/pubmed/15897298</ref> <ref name="doc1"/> <ref name="doc5"> Parker-Duffen JL, Nakamura K, Silver M, Zuriaga MA, MacLauchlan S, Aprahamian TR, Walsh K et al. «Divergent roles for adiponectin receptor 1 (AdipoR1) and AdipoR2 in mediating revascularization and metabolic dysfunction in vivo.» 17 April 2014 : https://www.ncbi.nlm.nih.gov/pubmed/24742672</ref> | The organisation of the structure of the Adiponectin receptor 1 is the opposite to [[G protein-coupled receptor]] family. Indeed, the Adiponectin receptor has an internal <scene name='82/829353/N-terminus_domain/2'>N-terminus domain</scene> and an external <scene name='82/829353/C-terminus_domain/3'>C-terminus domain</scene> while the G-protein family has an internal N-terminus domain and an external C-terminus domain. <ref name="doc3"> Takashi Kadowaki and Toshimasa Yamauchi et al. « Adiponectin and adiponectin receptors». 2015 https://www.ncbi.nlm.nih.gov/pubmed/15897298</ref> <ref name="doc1"/> <ref name="doc5"> Parker-Duffen JL, Nakamura K, Silver M, Zuriaga MA, MacLauchlan S, Aprahamian TR, Walsh K et al. «Divergent roles for adiponectin receptor 1 (AdipoR1) and AdipoR2 in mediating revascularization and metabolic dysfunction in vivo.» 17 April 2014 : https://www.ncbi.nlm.nih.gov/pubmed/24742672</ref> | ||
The Adiponectin receptor 1 contains <scene name='82/829353/7helices/1'>seven transmembrane helices</scene> linked thanks to three extracellular loops and three intracellular loops. The <scene name='82/829353/Helix1/2'>helix I</scene> is formed by the residues 135 to 157, <scene name='82/829353/Helix2/2'>helix II</scene> by the residues 169 to 192, the <scene name='82/829353/Helix3/2'>helix III</scene> by the residues 198 to 227, the <scene name='82/829353/Helix4/2'>helice IV</scene> by the residues 232 to 252, the <scene name='82/829353/Helice5/2'>helix V</scene> by the residues 264 to 288 <scene name='82/829353/Helix6/2'>heliX VI</scene> by the residues 305 to 319 and the <scene name='82/829353/Helix7/2'>helix VII</scene> by the residues 336 to 364 .Besides, the <scene name='82/829353/Helix3/2'>helix III</scene> and <scene name='82/829353/Helix7/2'>VII</scene> are longer than the other helices. These <scene name='82/829353/7tm/2'>seven transmembrane helices</scene> have a clockwise circular specific organisation (from helix I to helix VII) and form a bundle. | The Adiponectin receptor 1 contains <scene name='82/829353/7helices/1'>seven transmembrane helices</scene> linked thanks to three <scene name='82/829353/3externalloop/1'>extracellular loops</scene> and three <scene name='82/829353/3externalloop/1'>intracellular loops</scene>. The <scene name='82/829353/Helix1/2'>helix I</scene> is formed by the residues 135 to 157, <scene name='82/829353/Helix2/2'>helix II</scene> by the residues 169 to 192, the <scene name='82/829353/Helix3/2'>helix III</scene> by the residues 198 to 227, the <scene name='82/829353/Helix4/2'>helice IV</scene> by the residues 232 to 252, the <scene name='82/829353/Helice5/2'>helix V</scene> by the residues 264 to 288 <scene name='82/829353/Helix6/2'>heliX VI</scene> by the residues 305 to 319 and the <scene name='82/829353/Helix7/2'>helix VII</scene> by the residues 336 to 364 .Besides, the <scene name='82/829353/Helix3/2'>helix III</scene> and <scene name='82/829353/Helix7/2'>VII</scene> are longer than the other helices. These <scene name='82/829353/7tm/2'>seven transmembrane helices</scene> have a clockwise circular specific organisation (from helix I to helix VII) and form a bundle. | ||
Concerning the extracellular faces, the three extracellular loops which connect the transmembrane helices are exposed and it is the same for the <scene name='82/829353/C-terminus_domain/3'>C-terminus domain</scene>. Besides, <scene name='82/829353/Helix3/2'>helix III</scene> and the <scene name='82/829353/Helix7/2'>VII</scene> are longer than the other helices and as a result the <scene name='82/829353/C-terminus_domain/3'>C-terminus domain</scene> two turns of the <scene name='82/829353/Helix7/2'>VII</scene> are exposed too. <ref name="doc1"/> | Concerning the extracellular faces, the three <scene name='82/829353/3externalloop/1'>extracellular loops</scene> which connect the transmembrane helices are exposed and it is the same for the <scene name='82/829353/C-terminus_domain/3'>C-terminus domain</scene>. Besides, <scene name='82/829353/Helix3/2'>helix III</scene> and the <scene name='82/829353/Helix7/2'>VII</scene> are longer than the other helices and as a result the <scene name='82/829353/C-terminus_domain/3'>C-terminus domain</scene> two turns of the <scene name='82/829353/Helix7/2'>VII</scene> are exposed too. <ref name="doc1"/> | ||
In the middle of the seven transmembrane helices there is a large internal cavity where a <scene name='82/829353/Zinc-binding_site/2'>zinc-binding site</scene> can be found. This cavity located from the cytoplasmic surface to the middle of the outer lipid layer of the membrane has small openings between the <scene name='82/829353/Helice5/2'>helix V</scene> and <scene name='82/829353/Helix6/2'>VI</scene>, and between the <scene name='82/829353/Helix4/2'>helice IV</scene> and <scene name='82/829353/Helix6/2'>VI</scene>. It has been assumed that these openings are involved in the entrance and exit of both substrate and product. | In the middle of the seven transmembrane helices there is a large internal cavity where a <scene name='82/829353/Zinc-binding_site/2'>zinc-binding site</scene> can be found. This cavity located from the cytoplasmic surface to the middle of the outer lipid layer of the membrane has small openings between the <scene name='82/829353/Helice5/2'>helix V</scene> and <scene name='82/829353/Helix6/2'>VI</scene>, and between the <scene name='82/829353/Helix4/2'>helice IV</scene> and <scene name='82/829353/Helix6/2'>VI</scene>. It has been assumed that these openings are involved in the entrance and exit of both substrate and product. | ||
In this cavity, there is a zinc ion which is coordinated thanks to three histidine residues. These three histidine residues are <scene name='82/829353/H191/2'>H191</scene> in the helix II, <scene name='82/829353/H337/2'>H337</scene> and <scene name='82/829353/H341/2'>H341</scene> in the <scene name='82/829353/Helix7/2'>helix VII</scene>. As a result, the zinc ion is in the intracellular layer of the membrane, in the neighbourhood of 4° deep from the inner surface of the plasma membrane. Thanks to its tetrahedral coordination, this zinc ion binds the <scene name='82/829353/Helix2/2'>helix II</scene>, <scene name='82/829353/Helix3/2'>III</scene> and <scene name='82/829353/Helix7/2'>VII</scene> together. The adiponectin-stimulated AMPK phosphorylation doesn’t directly require the zinc binding site, nevertheless it has been supposed that the zinc ion allows a stabilizing effect. <ref name="doc1"/> | In this cavity, there is a zinc ion which is coordinated thanks to three histidine residues. These three histidine residues are <scene name='82/829353/H191/2'>H191</scene> in the helix II, <scene name='82/829353/H337/2'>H337</scene> and <scene name='82/829353/H341/2'>H341</scene> in the <scene name='82/829353/Helix7/2'>helix VII</scene>. As a result, the zinc ion is in the intracellular layer of the membrane, in the neighbourhood of 4° deep from the inner surface of the plasma membrane. Thanks to its tetrahedral coordination, this zinc ion binds the <scene name='82/829353/Helix2/2'>helix II</scene>, <scene name='82/829353/Helix3/2'>III</scene> and <scene name='82/829353/Helix7/2'>VII</scene> together. The adiponectin-stimulated AMPK phosphorylation doesn’t directly require the zinc binding site, nevertheless it has been supposed that the zinc ion allows a stabilizing effect. <ref name="doc1"/> | ||
