View source for 6hug


==CryoEM structure of human full-length alpha1beta3gamma2L GABA(A)R in complex with picrotoxin and megabody Mb38.==
<SX load='6hug' size='340' side='right' viewer='molstar' caption='[[6hug]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6hug]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus], [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Lama_glama Lama glama]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6HUG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6HUG 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]] 3.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=PIO:[(2R)-2-OCTANOYLOXY-3-[OXIDANYL-[(1R,2R,3S,4R,5R,6S)-2,3,6-TRIS(OXIDANYL)-4,5-DIPHOSPHONOOXY-CYCLOHEXYL]OXY-PHOSPHORYL]OXY-PROPYL]+OCTANOATE'>PIO</scene>, <scene name='pdbligand=RI5:(1AR,2AR,3S,6R,6AS,8AS,8BR,9R)-2A-HYDROXY-8B-METHYL-9-(PROP-1-EN-2-YL)HEXAHYDRO-3,6-METHANO-1,5,7-TRIOXACYCLOPENTA[IJ]CYCLOPROPA[A]AZULENE-4,8(3H)-DIONE'>RI5</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=6hug FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6hug OCA], [https://pdbe.org/6hug PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6hug RCSB], [https://www.ebi.ac.uk/pdbsum/6hug PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6hug ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GBRA1_BOVIN GBRA1_BOVIN] 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:3037384</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Type-A gamma-aminobutyric (GABAA) receptors are ligand-gated chloride channels with a very rich pharmacology. Some of their modulators, including benzodiazepines and general anaesthetics, are among the most successful drugs in clinical use and are common substances of abuse. Without reliable structural data, the mechanistic basis for the pharmacological modulation of GABAA receptors remains largely unknown. Here we report several high-resolution cryo-electron microscopy structures in which the full-length human alpha1beta3gamma2L GABAA receptor in lipid nanodiscs is bound to the channel-blocker picrotoxin, the competitive antagonist bicuculline, the agonist GABA (gamma-aminobutyric acid), and the classical benzodiazepines alprazolam and diazepam. We describe the binding modes and mechanistic effects of these ligands, the closed and desensitized states of the GABAA receptor gating cycle, and the basis for allosteric coupling between the extracellular, agonist-binding region and the transmembrane, pore-forming region. This work provides a structural framework in which to integrate previous physiology and pharmacology research and a rational basis for the development of GABAA receptor modulators.

GABAA receptor signalling mechanisms revealed by structural pharmacology.,Masiulis S, Desai R, Uchanski T, Serna Martin I, Laverty D, Karia D, Malinauskas T, Zivanov J, Pardon E, Kotecha A, Steyaert J, Miller KW, Aricescu AR Nature. 2019 Jan 2. pii: 10.1038/s41586-018-0832-5. doi:, 10.1038/s41586-018-0832-5. PMID:30602790<ref>PMID:30602790</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6hug" style="background-color:#fffaf0;"></div>

==See Also==
*[[GABA receptor 3D structures|GABA receptor 3D structures]]
== References ==
<references/>
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</SX>
[[Category: Bos taurus]]
[[Category: Homo sapiens]]
[[Category: Lama glama]]
[[Category: Large Structures]]
[[Category: Aricescu AR]]
[[Category: Desai R]]
[[Category: Jasenko Z]]
[[Category: Karia D]]
[[Category: Kotecha A]]
[[Category: Laverty D]]
[[Category: Malinauskas T]]
[[Category: Masiulis S]]
[[Category: Miller KW]]
[[Category: Pardon E]]
[[Category: Serna Martin I]]
[[Category: Steyaert J]]
[[Category: Uchanski T]]