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-Structure paper
| タイトル | Structural basis of human zinc-activated channel (ZAC) signaling and modulation. |
|---|---|
| ジャーナル・号・ページ | Cell Discov, Vol. 12, Issue 1, Year 2026 |
| 掲載日 | 2026年3月31日 |
著者 | Zixuan Zhou / Yonghui Long / Yulin Chao / Chuanhui Yang / Yi-Quan Tang / Yilai Shu / Hongtao Zhu / Anders A Jensen / Qianhui Qu / ![]() |
| PubMed 要旨 | Zinc (Zn) plays essential roles in a plethora of physiological processes, including key functions as a neuromodulator. The zinc-activated channel (ZAC) belongs to the Cys-loop receptor (CLR) ...Zinc (Zn) plays essential roles in a plethora of physiological processes, including key functions as a neuromodulator. The zinc-activated channel (ZAC) belongs to the Cys-loop receptor (CLR) superfamily of pentameric ligand-gated ion channels, which also comprises receptors for the important neurotransmitters acetylcholine, serotonin, GABA and glycine. In contrast to these classical CLRs, which have been extensively explored over decades, ZAC remains poorly characterized despite its potential significance in mammals. Here, we present several cryo-EM structures of human ZAC, including the ligand-free resting state, the Zn-bound state, and several antagonist-bound states. In the Zn-bound structure, Zn ions bind to the subunit interfaces of the extracellular domain, corresponding to the canonical agonist-binding sites in the classical CLRs, and are primarily coordinated through cation‒π interactions with two aromatic residues. While the antagonist TTFB inhibits ZAC by insertion between the transmembrane M2 helices of adjacent subunits, d-tubocurarine acts in a dual manner by blocking the channel and interfering with agonist binding. Combined with mutagenesis and electrophysiological analysis, these evaluations highlight the distinctive structural and functional features of this atypical CLR. |
リンク | Cell Discov / PubMed:41912481 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.54 - 3.35 Å |
| 構造データ | EMDB-63033, PDB-9let: EMDB-63034, PDB-9leu: EMDB-63035, PDB-9lev: EMDB-63036, PDB-9lex: EMDB-63037, PDB-9ley: EMDB-63038, PDB-9lez: |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-TC9: ![]() PDB-1ekj: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Cys-loop receptor / homopentamer / cation channel / zinc-binding state / d-tubocurarine-binding site / TTFB binding state |
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homo sapiens (ヒト)
enterovirus a71 (エンテロウイルス)
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