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-Structure paper
| タイトル | Structure of the human K13.1 channel reveals a hydrophilic pore restriction and lipid cofactor site. |
|---|---|
| ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 32, Issue 7, Page 1154-1166, Year 2025 |
| 掲載日 | 2025年2月26日 |
著者 | Shatabdi Roy-Chowdhury / Seil Jang / Fayal Abderemane-Ali / Fiona Naughton / Michael Grabe / Daniel L Minor / ![]() |
| PubMed 要旨 | Polyunsaturated fatty acid (PUFA) lipids modulate the neuronal and microglial leak potassium channel K13.1 (THIK1) and other voltage-gated ion channel (VGIC) superfamily members through poorly ...Polyunsaturated fatty acid (PUFA) lipids modulate the neuronal and microglial leak potassium channel K13.1 (THIK1) and other voltage-gated ion channel (VGIC) superfamily members through poorly understood mechanisms. Here we present cryo-electron microscopy structures of human THIK1 and mutants, revealing a unique two-chamber aqueous inner cavity obstructed by a hydrophilic barrier important for gating, the flow restrictor, and a P1-M4 intersubunit interface lipid at a site, the PUFA site, corresponding to the K small-molecule modulator pocket. This overlap, together with functional studies, indicates that PUFA site lipids are THIK1 cofactors. Comparison with a PUFA-responsive VGIC, K7.1, reveals a shared modulatory role for the pore domain intersubunit interface, providing a framework for understanding PUFA action on the VGIC superfamily. Our findings reveal the distinct THIK1 architecture, highlight the importance of the P1-M4 interface for K control by natural and synthetic ligands and should aid in the development of THIK subfamily modulators for neuroinflammation and autism. |
リンク | Nat Struct Mol Biol / PubMed:40011746 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.36 - 2.95 Å |
| 構造データ | EMDB-44870, PDB-9bsn: EMDB-44978, PDB-9bws: EMDB-45034, PDB-9byi: EMDB-45075, PDB-9c07: EMDB-45077, PDB-9c09: |
| 化合物 | ![]() ChemComp-D12: ![]() ChemComp-D10: ![]() ChemComp-OCT: ![]() ChemComp-EIC: ![]() ChemComp-K: ![]() ChemComp-HEX: ![]() ChemComp-R16: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Potassium channel / K2P / ion channel / k2p channel / membrane protein |
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homo sapiens (ヒト)
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