6X40

Human GABAA receptor alpha1-beta2-gamma2 subtype in complex with GABA plus picrotoxin

6X40 の概要

• エントリーDOI: 10.2210/pdb6x40/pdb
• EMDBエントリー: 22038
• 分子名称: Gamma-aminobutyric acid receptor subunit beta-2, GAMMA-AMINO-BUTANOIC ACID, (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]c yclopropa[a]azulene-4,8(3H)-dione, ... (11 entities in total)
• 機能のキーワード: ion channel, cys-loop receptor, pentametic ligand gated channel, gabaa receptor, membrane protein
• 由来する生物種: Homo sapiens (Human); 詳細
• タンパク質・核酸の鎖数: 9
• 化学式量合計: 364896.17

構造登録者

Kim, J.J.,Gharpure, A.,Teng, J.,Zhuang, Y.,Howard, R.J.,Zhu, S.,Noviello, C.M.,Walsh, R.M.,Lindahl, E.,Hibbs, R.E. (登録日: 2020-05-21, 公開日: 2020-09-09, 最終更新日: 2024-10-30)

主引用文献

Kim, J.J.,Gharpure, A.,Teng, J.,Zhuang, Y.,Howard, R.J.,Zhu, S.,Noviello, C.M.,Walsh Jr., R.M.,Lindahl, E.,Hibbs, R.E.
Shared structural mechanisms of general anaesthetics and benzodiazepines.
Nature, 585:303-308, 2020

PubMed Abstract: Most general anaesthetics and classical benzodiazepine drugs act through positive modulation of γ-aminobutyric acid type A (GABA) receptors to dampen neuronal activity in the brain. However, direct structural information on the mechanisms of general anaesthetics at their physiological receptor sites is lacking. Here we present cryo-electron microscopy structures of GABA receptors bound to intravenous anaesthetics, benzodiazepines and inhibitory modulators. These structures were solved in a lipidic environment and are complemented by electrophysiology and molecular dynamics simulations. Structures of GABA receptors in complex with the anaesthetics phenobarbital, etomidate and propofol reveal both distinct and common transmembrane binding sites, which are shared in part by the benzodiazepine drug diazepam. Structures in which GABA receptors are bound by benzodiazepine-site ligands identify an additional membrane binding site for diazepam and suggest an allosteric mechanism for anaesthetic reversal by flumazenil. This study provides a foundation for understanding how pharmacologically diverse and clinically essential drugs act through overlapping and distinct mechanisms to potentiate inhibitory signalling in the brain.

PubMed: 32879488
DOI: 10.1038/s41586-020-2654-5

実験手法

ELECTRON MICROSCOPY (2.86 Å)