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登録情報 | データベース: PDB / ID: 9h9e | ||||||||||||||||||
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タイトル | Cryo-EM structure of the human GABAA receptor alpha1 subunit in complex with the assembly factor NACHO/TMEM35A | ||||||||||||||||||
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![]() | MEMBRANE PROTEIN / Assembly intermediate / ion channel / chaperone / Neurotransmitter receptor / Membrane protein biogenesis | ||||||||||||||||||
機能・相同性 | ![]() acetylcholine receptor regulator activity / GABA receptor complex / positive regulation of protein localization to cell surface / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / peroxisomal membrane / postsynaptic specialization membrane ...acetylcholine receptor regulator activity / GABA receptor complex / positive regulation of protein localization to cell surface / GABA receptor activation / GABA-A receptor activity / GABA-gated chloride ion channel activity / GABA-A receptor complex / inhibitory synapse assembly / peroxisomal membrane / postsynaptic specialization membrane / synaptic transmission, GABAergic / gamma-aminobutyric acid signaling pathway / Signaling by ERBB4 / chloride channel complex / chaperone-mediated protein complex assembly / dendrite membrane / cytoplasmic vesicle membrane / chloride transmembrane transport / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / GABA-ergic synapse / cytoplasmic vesicle / dendritic spine / postsynapse / endoplasmic reticulum membrane / endoplasmic reticulum / plasma membrane 類似検索 - 分子機能 | ||||||||||||||||||
生物種 | ![]() | ||||||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.6 Å | ||||||||||||||||||
![]() | Hooda, Y. / Sente, A. / Judy, R.M. / Smalinskaite, L. / Peak-Chew, S. / Naydenova, K. / Malinauskas, T. / Hardwick, S.W. / Chirgadze, D.Y. / Aricescu, A.R. / Hegde, R.S. | ||||||||||||||||||
資金援助 | ![]() ![]()
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![]() | ![]() タイトル: Mechanism of NACHO-mediated assembly of pentameric ligand-gated ion channels. 著者: Yogesh Hooda / Andrija Sente / Ryan M Judy / Luka Smalinskaitė / Sew-Yeu Peak-Chew / Katerina Naydenova / Tomas Malinauskas / Steven W Hardwick / Dimitri Y Chirgadze / A Radu Aricescu / Ramanujan S Hegde / ![]() 要旨: Pentameric ligand-gated ion channels (pLGICs) are cell surface receptors of crucial importance for animal physiology. This diverse protein family mediates the ionotropic signals triggered by major ...Pentameric ligand-gated ion channels (pLGICs) are cell surface receptors of crucial importance for animal physiology. This diverse protein family mediates the ionotropic signals triggered by major neurotransmitters and includes γ-aminobutyric acid receptors (GABARs) and acetylcholine receptors (nAChRs). Receptor function is fine-tuned by a myriad of endogenous and pharmacological modulators. A functional pLGIC is built from five homologous, sometimes identical, subunits, each containing a β-scaffold extracellular domain (ECD), a four-helix transmembrane domain (TMD) and intracellular loops of variable length. Although considerable progress has been made in understanding pLGICs in structural and functional terms, the molecular mechanisms that enable their assembly at the endoplasmic reticulum (ER) in a vast range of potential subunit configurations remain unknown. Here, we identified candidate pLGICs assembly factors selectively associated with an unassembled GABAR subunit. Focusing on one of the candidates, we determined the cryo-EM structure of an assembly intermediate containing two α1 subunits of GABAR each bound to an ER-resident membrane protein NACHO. The structure showed how NACHO shields the principal (+) transmembrane interface of α1 subunits containing an immature extracellular conformation. Crosslinking and structure-prediction revealed an adjacent surface on NACHO for β2 subunit interactions to guide stepwise oligimerisation. Mutations of either subunit-interacting surface on NACHO also impaired the formation of homopentameric α7 nAChRs, pointing to a generic framework for pLGIC assembly. Our work provides the foundation for understanding the regulatory principles underlying pLGIC structural diversity. | ||||||||||||||||||
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