哺乳动物赖诺丁受体的结构
Ran Zalk1, Oliver B Clarke2, Amédée des Georges2
1Department of Physiology and Cellular Biophysics, Columbia University, New York, New York 10032, USA.
Nature
|December 4, 2014
概括
瑞诺丁受体 (RyRs) 控制的释放,这对肌肉功能至关重要. 这项研究揭示了RyR1的封闭状态结构,详细说明了其孔隙和调节域,为门机制提供了洞察力.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子生理学分子生理学
背景情况:
- 瑞诺丁受体 (RyRs) 对于细胞 (Ca2+) 信号传递至关重要,特别是在肌肉刺激-收缩合中.
- 了解 RyR 结构对于阐明门禁和监管机制至关重要,但由于缺乏详细的结构信息而受到限制.
研究的目的:
- 为了确定子骨肌1型RyR (RyR1) 综合体的高分辨率封闭状态结构.
- 提供RyR1跨膜孔及其相关的细胞分裂域的前所未有的细节.
- 根据结构性发现,提出一种Ca2+依赖性通道封闭机制.
主要方法:
- 使用单粒子电子冷显微镜 (cryo-EM) 来解决2.3兆瓦的RyR1复杂结构.
- 一个聚氨酸水平模型被安装在冷EM地图上,使所有有序残留物的详细分析成为可能.
- 透膜孔结构和细胞质域组织得到了阐明.
主要成果:
- RyR1综合体的封闭状态结构以4.8 Å分辨率确定.
- 跨膜孔结构得到了前所未有的细节解析,确定它属于六个跨膜离子通道超级家族.
- 关键的调节领域及其通过α-solenoid支架与孔隙的连接被描述.
- 一个与EF手相互作用的独特域表明了Ca2+封闭机制.
结论:
- 详细的RyR1结构为了解其门和监管提供了基础.
- 鉴定的孔隙结构和独特的门域为Ca2+释放提供了机理性的见解.
- 这些结构信息对于未来对RyR功能和相关疾病的研究至关重要.
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