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-Structure paper
タイトル | Structural Basis for Pore Blockade of the Human Cardiac Sodium Channel Na 1.5 by the Antiarrhythmic Drug Quinidine*. |
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ジャーナル・号・ページ | Angew Chem Int Ed Engl, Vol. 60, Issue 20, Page 11474-11480, Year 2021 |
掲載日 | 2021年5月10日 |
著者 | Zhangqiang Li / Xueqin Jin / Tong Wu / Gaoxingyu Huang / Kun Wu / Jianlin Lei / Xiaojing Pan / Nieng Yan / |
PubMed 要旨 | Na 1.5, the primary voltage-gated Na (Na ) channel in heart, is a major target for class I antiarrhythmic agents. Here we present the cryo-EM structure of full-length human Na 1.5 bound to quinidine, ...Na 1.5, the primary voltage-gated Na (Na ) channel in heart, is a major target for class I antiarrhythmic agents. Here we present the cryo-EM structure of full-length human Na 1.5 bound to quinidine, a class Ia antiarrhythmic drug, at 3.3 Å resolution. Quinidine is positioned right beneath the selectivity filter in the pore domain and coordinated by residues from repeats I, III, and IV. Pore blockade by quinidine is achieved through both direct obstruction of the ion permeation path and induced rotation of an invariant Tyr residue that tightens the intracellular gate. Structural comparison with a truncated rat Na 1.5 in the presence of flecainide, a class Ic agent, reveals distinct binding poses for the two antiarrhythmics within the pore domain. Our work reported here, along with previous studies, reveals the molecular basis for the mechanism of action of class I antiarrhythmic drugs. |
リンク | Angew Chem Int Ed Engl / PubMed:33684260 |
手法 | EM (単粒子) |
解像度 | 3.3 Å |
構造データ | |
化合物 | ChemComp-NAG: ChemComp-QDN: |
由来 |
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キーワード | TRANSPORT PROTEIN / membrane protein / Voltage-gated sodium channel |