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-Structure paper
| タイトル | Structural Basis for the Modulation of Human KCNQ4 by Small-Molecule Drugs. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 81, Issue 1, Page 25-37.e4, Year 2021 |
| 掲載日 | 2021年1月7日 |
著者 | Tian Li / Kun Wu / Zhenlei Yue / Yifei Wang / Fan Zhang / Huaizong Shen / ![]() |
| PubMed 要旨 | Among the five KCNQ channels, also known as the K7 voltage-gated potassium (K) channels, KCNQ2-KCNQ5 control neuronal excitability. Dysfunctions of KCNQ2-KCNQ5 are associated with neurological ...Among the five KCNQ channels, also known as the K7 voltage-gated potassium (K) channels, KCNQ2-KCNQ5 control neuronal excitability. Dysfunctions of KCNQ2-KCNQ5 are associated with neurological disorders such as epilepsy, deafness, and neuropathic pain. Here, we report the cryoelectron microscopy (cryo-EM) structures of human KCNQ4 and its complexes with the opener retigabine or the blocker linopirdine at overall resolutions of 2.5, 3.1, and 3.3 Å, respectively. In all structures, a phosphatidylinositol 4,5-bisphosphate (PIP) molecule inserts its head group into a cavity within each voltage-sensing domain (VSD), revealing an unobserved binding mode for PIP. Retigabine nestles in each fenestration, inducing local shifts. Instead of staying within the central pore, linopirdine resides in a cytosolic cavity underneath the inner gate. Electrophysiological analyses of various mutants corroborated the structural observations. Our studies reveal the molecular basis for the modulatory mechanism of neuronal KCNQ channels and provide a framework for structure-facilitated drug discovery targeting these important channels. |
リンク | Mol Cell / PubMed:33238160 |
| 手法 | EM (単粒子) |
| 解像度 | 2.5 - 3.3 Å |
| 構造データ | EMDB-30244, PDB-7byl: EMDB-30245, PDB-7bym: EMDB-30246, PDB-7byn: |
| 化合物 | ![]() ChemComp-PT5: ![]() ChemComp-K: ![]() ChemComp-HOH: ![]() ChemComp-FBX: ![]() ChemComp-FCC: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / KCNQ / Channel / Calmodulin / PIP2 / retigabine / linopirdine |
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