6WIV

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

Summary for 6WIV

• Entry DOI: 10.2210/pdb6wiv/pdb
• EMDB information: 21685
• Descriptor: 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)
• Functional Keywords: g protein coupled receptor (gpcr), gaba, gaba(b) receptor, class c gpcr, phospholipids, inhibitory neurotransmission., membrane protein
• Biological source: Homo sapiens (Human); More
• Total number of polymer chains: 2
• Total formula weight: 191236.30

Authors

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. (deposition date: 2020-04-10, release date: 2020-07-01, Last modification date: 2024-10-09)

Primary citation

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

Experimental method

ELECTRON MICROSCOPY (3.3 Å)