The structure of a calsequestrin filament reveals mechanisms of familial arrhythmia.

The structure of a calsequestrin filament reveals mechanisms of familial arrhythmia.
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DOI:
10.1038/s41594-020-0510-9
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发表时间:
2020-12
影响因子:
16.8
通讯作者:
Deo RC
Deo RC
中科院分区:
生物学1区
文献类型:
--
作者:
Titus EW;Deiter FH;Shi C;Wojciak J;Scheinman M;Jura N;Deo RC

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钙结合蛋白Calequestrin的突变导致高度致命的家族性心律失常,儿茶酚胺能多形性室性心动过速(CPVT)。在体内,钙调素多聚体形成细丝,但缺乏钙调素细丝的原子分辨结构。我们报道了一种人类心脏钙调素细丝的晶体结构,并进行了支持突变分析和体外成丝分析。我们鉴定并鉴定了一种新的与疾病相关的钙调蛋白突变S173I,它位于细丝形成界面,并进一步表明先前报道的显性疾病突变K180R映射到同一表面。这两个突变都破坏了细丝形成,这表明疾病的病理是由于多聚体形成的缺陷造成的。Yb衍生结构在成丝界面上精确定位了多个可信的钙位置,解释了在钙存在的情况下钙化胶丝形成的原子基础。因此,我们的研究提供了一个统一的分子机制,即显性作用的钙调素基因突变引发致命性心律失常。
Mutations in the calcium-binding protein calsequestrin cause the highly lethal familial arrhythmia catecholaminergic polymorphic ventricular tachycardia (CPVT). In vivo, calsequestrin multimerizes into filaments, but an atomic-resolution structure of a calsequestrin filament is lacking. We report a crystal structure of a human cardiac calsequestrin filament with supporting mutational analysis and in vitro filamentation assays. We identify and characterize a novel disease-associated calsequestrin mutation, S173I, that is located at the filament-forming interface, and further show that a previously reported dominant disease mutation, K180R, maps to the same surface. Both mutations disrupt filamentation, suggesting that disease pathology is due to defects in multimer formation. An ytterbium-derivatized structure pinpoints multiple credible calcium sites at filament-forming interfaces, explaining the atomic basis of calsequestrin filamentation in the presence of calcium. Our study thus provides a unifying molecular mechanism by which dominant-acting calsequestrin mutations provoke lethal arrhythmias.
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发表时间: 2006-01-01
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