Journal: Angew Chem Int Ed Engl / Year: 2021 Title: Structural Basis for Pore Blockade of the Human Cardiac Sodium Channel Na 1.5 by the Antiarrhythmic Drug Quinidine*. Authors: Zhangqiang Li / Xueqin Jin / Tong Wu / Gaoxingyu Huang / Kun Wu / Jianlin Lei / Xiaojing Pan / Nieng Yan / Abstract: 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.
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Jan 13, 2020
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Mar 24, 2021
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Mar 24, 2021
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May 19, 2021
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May 19, 2021
Processing site: PDBj / Status: Released
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