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-Structure paper
タイトル | Channel opening and gating mechanism in AMPA-subtype glutamate receptors. |
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ジャーナル・号・ページ | Nature, Vol. 549, Issue 7670, Page 60-65, Year 2017 |
掲載日 | 2017年9月7日 |
著者 | Edward C Twomey / Maria V Yelshanskaya / Robert A Grassucci / Joachim Frank / Alexander I Sobolevsky / |
PubMed 要旨 | AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid)-subtype ionotropic glutamate receptors mediate fast excitatory neurotransmission throughout the central nervous system. Gated by the ...AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid)-subtype ionotropic glutamate receptors mediate fast excitatory neurotransmission throughout the central nervous system. Gated by the neurotransmitter glutamate, AMPA receptors are critical for synaptic strength, and dysregulation of AMPA receptor-mediated signalling is linked to numerous neurological diseases. Here we use cryo-electron microscopy to solve the structures of AMPA receptor-auxiliary subunit complexes in the apo, antagonist- and agonist-bound states and determine the iris-like mechanism of ion channel opening. The ion channel selectivity filter is formed by the extended portions of the re-entrant M2 loops, while the helical portions of M2 contribute to extensive hydrophobic interfaces between AMPA receptor subunits in the ion channel. We show how the permeation pathway changes upon channel opening and identify conformational changes throughout the entire AMPA receptor that accompany activation and desensitization. Our findings provide a framework for understanding gating across the family of ionotropic glutamate receptors and the role of AMPA receptors in excitatory neurotransmission. |
リンク | Nature / PubMed:28737760 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.2 - 6.8 Å |
構造データ | EMDB-8819, PDB-5wek: |
化合物 | ChemComp-ZK1: ChemComp-AJP: ChemComp-GLU: |
由来 |
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キーワード | TRANSPORT PROTEIN / Ion channel |