6WIV

Structure of human GABA(B) receptor in an inactive state

6WIV の概要

• エントリーDOI: 10.2210/pdb6wiv/pdb
• EMDBエントリー: 21685
• 分子名称: Gamma-aminobutyric acid type B receptor subunit 1, Gamma-aminobutyric acid type B receptor subunit 2, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (7 entities in total)
• 機能のキーワード: g protein coupled receptor (gpcr), gaba, gaba(b) receptor, class c gpcr, phospholipids, inhibitory neurotransmission., membrane protein
• 由来する生物種: Homo sapiens (Human); 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 191236.30

構造登録者

Park, J.,Fu, Z.,Frangaj, A.,Liu, J.,Mosyak, L.,Shen, T.,Slavkovich, V.N.,Ray, K.M.,Taura, J.,Cao, B.,Geng, Y.,Zuo, H.,Kou, Y.,Grassucci, R.,Chen, S.,Liu, Z.,Lin, X.,Williams, J.P.,Rice, W.J.,Eng, E.T.,Huang, R.K.,Soni, R.K.,Kloss, B.,Yu, Z.,Javitch, J.A.,Hendrickson, W.A.,Slesinger, P.A.,Quick, M.,Graziano, J.,Yu, H.,Fiehn, O.,Clarke, O.B.,Frank, J.,Fan, Q.R. (登録日: 2020-04-10, 公開日: 2020-07-01, 最終更新日: 2024-10-09)

主引用文献

Park, J.,Fu, Z.,Frangaj, A.,Liu, J.,Mosyak, L.,Shen, T.,Slavkovich, V.N.,Ray, K.M.,Taura, J.,Cao, B.,Geng, Y.,Zuo, H.,Kou, Y.,Grassucci, R.,Chen, S.,Liu, Z.,Lin, X.,Williams, J.P.,Rice, W.J.,Eng, E.T.,Huang, R.K.,Soni, R.K.,Kloss, B.,Yu, Z.,Javitch, J.A.,Hendrickson, W.A.,Slesinger, P.A.,Quick, M.,Graziano, J.,Yu, H.,Fiehn, O.,Clarke, O.B.,Frank, J.,Fan, Q.R.
Structure of human GABABreceptor in an inactive state.
Nature, 584:304-309, 2020

PubMed Abstract: The human GABA receptor-a member of the class C family of G-protein-coupled receptors (GPCRs)-mediates inhibitory neurotransmission and has been implicated in epilepsy, pain and addiction. A unique GPCR that is known to require heterodimerization for function, the GABA receptor has two subunits, GABA and GABA, that are structurally homologous but perform distinct and complementary functions. GABA recognizes orthosteric ligands, while GABA couples with G proteins. Each subunit is characterized by an extracellular Venus flytrap (VFT) module, a descending peptide linker, a seven-helix transmembrane domain and a cytoplasmic tail. Although the VFT heterodimer structure has been resolved, the structure of the full-length receptor and its transmembrane signalling mechanism remain unknown. Here we present a near full-length structure of the GABA receptor, captured in an inactive state by cryo-electron microscopy. Our structure reveals several ligands that preassociate with the receptor, including two large endogenous phospholipids that are embedded within the transmembrane domains to maintain receptor integrity and modulate receptor function. We also identify a previously unknown heterodimer interface between transmembrane helices 3 and 5 of both subunits, which serves as a signature of the inactive conformation. A unique 'intersubunit latch' within this transmembrane interface maintains the inactive state, and its disruption leads to constitutive receptor activity.

PubMed: 32581365
DOI: 10.1038/s41586-020-2452-0

実験手法

ELECTRON MICROSCOPY (3.3 Å)