View source for 8sgo


==Human GABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus pregnenolone sulfate==
<StructureSection load='8sgo' size='340' side='right'caption='[[8sgo]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8sgo]] is a 9 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8SGO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8SGO FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.65&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A8W:[(3~{S},8~{S},9~{S},10~{R},13~{S},14~{S},17~{S})-17-ethanoyl-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1~{H}-cyclopenta[a]phenanthren-3-yl]+hydrogen+sulfate'>A8W</scene>, <scene name='pdbligand=ABU:GAMMA-AMINO-BUTANOIC+ACID'>ABU</scene>, <scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PTY:PHOSPHATIDYLETHANOLAMINE'>PTY</scene>, <scene name='pdbligand=Q3G:(2~{R})-2-azanyl-3-[[(2~{S})-2-hexadecanoyloxy-3-octadecanoyloxy-propoxy]-oxidanyl-phosphoryl]oxy-propanoic+acid'>Q3G</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=8sgo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8sgo OCA], [https://pdbe.org/8sgo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8sgo RCSB], [https://www.ebi.ac.uk/pdbsum/8sgo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8sgo ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GBRB2_HUMAN GBRB2_HUMAN] Component of the heteropentameric receptor for GABA, the major inhibitory neurotransmitter in the vertebrate brain. Functions also as histamine receptor and mediates cellular responses to histamine. Functions as receptor for diazepines and various anesthetics, such as pentobarbital; these are bound at a separate allosteric effector binding site. Functions as ligand-gated chloride channel.<ref>PMID:19763268</ref> <ref>PMID:8264558</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
gamma-Aminobutyric acid type A (GABA(A)) receptors mediate fast inhibitory signaling in the brain and are targets of numerous drugs and endogenous neurosteroids. A subset of neurosteroids are GABA(A) receptor positive allosteric modulators; one of these, allopregnanolone, is the only drug approved specifically for treating postpartum depression. There is a consensus emerging from structural, physiological and photolabeling studies as to where positive modulators bind, but how they potentiate GABA activation remains unclear. Other neurosteroids are negative modulators of GABA(A) receptors, but their binding sites remain debated. Here we present structures of a synaptic GABA(A) receptor bound to allopregnanolone and two inhibitory sulfated neurosteroids. Allopregnanolone binds at the receptor-bilayer interface, in the consensus potentiator site. In contrast, inhibitory neurosteroids bind in the pore. MD simulations and electrophysiology support a mechanism by which allopregnanolone potentiates channel activity and suggest the dominant mechanism for sulfated neurosteroid inhibition is through pore block.

Structural insights into opposing actions of neurosteroids on GABA(A) receptors.,Legesse DH, Fan C, Teng J, Zhuang Y, Howard RJ, Noviello CM, Lindahl E, Hibbs RE Nat Commun. 2023 Aug 22;14(1):5091. doi: 10.1038/s41467-023-40800-1. PMID:37607940<ref>PMID:37607940</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8sgo" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Fan C]]
[[Category: Hibbs RE]]
[[Category: Howard RJ]]
[[Category: Legesse DH]]
[[Category: Lindahl E]]
[[Category: Noviello CM]]
[[Category: Teng J]]
[[Category: Zhuang Y]]