Calsequestrin interacts directly with the cardiac ryanodine receptor luminal domain.

Calsequestrin interacts directly with the cardiac ryanodine receptor luminal domain.
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DOI:
10.1242/jcs.191643
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发表时间:
2016-11-01
影响因子:
4
通讯作者:
Zissimopoulos S
Zissimopoulos S
中科院分区:
生物学2区
文献类型:
--
作者:
Handhle A;Ormonde CE;Thomas NL;Bralesford C;Williams AJ;Lai FA;Zissimopoulos S

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心肌收缩需要肌浆网(SR) Ca2+释放,这是由ryanodine受体2 (RyR2)、calsequestrin 2 (CSQ2)、连接蛋白(由ASPH编码)和triadin组成的四元复合物介导的。在这里,我们证明了RyR2和CSQ2之间存在直接的相互作用。拓扑结构上,CSQ2结合发生在RyR2的第一个腔内环。与仅表达RyR2的细胞相比,在缺乏其他四元复合物蛋白的人类细胞系中,RyR2和CSQ2的共表达导致Ca2+释放动力学的改变。这些发现为了解SR腔内Ca2+传感器及其参与心脏生理和疾病提供了新的视角。摘要:钙sequestrin 2与ryanodine受体管腔结构域的直接物理和功能关联是形成肌浆网Ca2+传感器的最低要求,其控制心脏Ca2+稳态和可靠的心跳。
Cardiac muscle contraction requires sarcoplasmic reticulum (SR) Ca2+ release mediated by the quaternary complex comprising the ryanodine receptor 2 (RyR2), calsequestrin 2 (CSQ2), junctin (encoded by ASPH) and triadin. Here, we demonstrate that a direct interaction exists between RyR2 and CSQ2. Topologically, CSQ2 binding occurs at the first luminal loop of RyR2. Co-expression of RyR2 and CSQ2 in a human cell line devoid of the other quaternary complex proteins results in altered Ca2+-release dynamics compared to cells expressing RyR2 only. These findings provide a new perspective for understanding the SR luminal Ca2+ sensor and its involvement in cardiac physiology and disease. Summary: Direct physical and functional calsequestrin 2 association with the ryanodine receptor luminal domain is the minimal requirement to form the sarcoplasmic reticulum Ca2+ sensor, which governs cardiac Ca2+ homeostasis and reliable heartbeat.
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