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-Structure paper
| タイトル | Secondary structure transitions and dual PIP2 binding define cardiac KCNQ1-KCNE1 channel gating. |
|---|---|
| ジャーナル・号・ページ | Cell Res, Vol. 35, Issue 11, Page 887-899, Year 2025 |
| 掲載日 | 2025年10月2日 |
著者 | Ling Zhong / Xiaoqing Lin / Xinyu Cheng / Shuangyan Wan / Yaoguang Hua / Weiwei Nan / Bin Hu / Xiangjun Peng / Zihan Zhou / Qiansen Zhang / Huaiyu Yang / Frank Noé / Zhenzhen Yan / Dexiang Jiang / Hangyu Zhang / Fengjiao Liu / Chenxin Xiao / Zhuo Zhou / Yimin Mou / Haijie Yu / Lijuan Ma / Chen Huang / Vincent Kam Wai Wong / Sookja Kim Chung / Bing Shen / Zhi-Hong Jiang / Erwin Neher / Wandi Zhu / Jin Zhang / Panpan Hou / ![]() |
| PubMed 要旨 | The KCNQ1 + KCNE1 potassium channel complex produces the slow delayed rectifier current (I) critical for cardiac repolarization. Loss-of-function mutations in KCNQ1 and KCNE1 cause long QT ...The KCNQ1 + KCNE1 potassium channel complex produces the slow delayed rectifier current (I) critical for cardiac repolarization. Loss-of-function mutations in KCNQ1 and KCNE1 cause long QT syndrome (LQTS) types 1 and 5 (LQT1/LQT5), accounting for over one-third of clinical LQTS cases. Despite prior structural work on KCNQ1 and KCNQ1 + KCNE3, the structural basis of KCNQ1 + KCNE1 remains unresolved. Using cryo-electron microscopy and electrophysiology, we determined high-resolution (2.5-3.4 Å) structures of human KCNQ1, and KCNQ1 + KCNE1 in both closed and open states. KCNE1 occupies a pivotal position at the interface of three KCNQ1 subunits, inducing six helix-to-loop transitions in KCNQ1 transmembrane segments. Three of them occur at both ends of the S4-S5 linker, maintaining a loop conformation during I gating, while the other three, in S6 and helix A, undergo dynamic helix-loop transitions during I gating. These structural rearrangements: (1) stabilize the closed pore and the conformation of the intermediate state voltage-sensing domain, thereby determining channel gating, ion permeation, and single-channel conductance; (2) enable a dual-PIP2 modulation mechanism, where one PIP2 occupies the canonical site, while the second PIP2 bridges the S4-S5 linker, KCNE1, and the adjacent S6', stabilizing channel opening; (3) create a fenestration capable of binding compounds specific for KCNQ1 + KCNE1 (e.g., AC-1). Together, these findings reveal a previously unrecognized large-scale secondary structural transition during ion channel gating that fine-tunes I function and provides a foundation for developing targeted LQTS therapy. |
リンク | Cell Res / PubMed:41034624 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.9 - 3.36 Å |
| 構造データ | EMDB-63935, PDB-9u7f: EMDB-64038, PDB-9uc8: |
| 化合物 | ![]() ChemComp-PT5: ![]() ChemComp-K: ![]() ChemComp-CA: ![]() ChemComp-PIO: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Ion channels |
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