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Updated: Jun 25, 2025

Functional Characterization of Endogenously Expressed Human RYR1 Variants

Functional Characterization of Endogenously Expressed Human RYR1 Variants

Published on: June 9, 2021

在骨肌功能和发育中RyR1的S-化作用的生理作用

Qi-An Sun¹, Zachary W Grimmett¹, Douglas T Hess¹

¹Institute for Transformative Molecular Medicine and Department of Medicine, Case Western Reserve University School of Medicine and University Hospitals Cleveland Medical Center, Cleveland, OH, 44106, USA.

Biochemical and biophysical research communications

|May 31, 2024

概括

骨肌的功能依赖于RyR1的释放. 准Cys3636 S-化,一个关键的修饰,影响肌肉收缩性和发育,揭示了它的生理重要性.

科学领域:

肌肉生理学和生物物理学
分子和细胞生物学分子和细胞生物学
生物化学和氧化还原信号传递.

背景情况:

骨肌中的激发-收缩合取决于通过RyR1.1释放Ca2+的情况.
RyR1有~100个Cys硫醇,其中~30个通过S-化,S-棕化和S-氧化修饰的全性网络.
这些RyR1修饰的生理作用,特别是S-化,仍然在很大程度上未知.

研究的目的:

研究骨肌肉中RyR1在Cys3636的S-化酶的生理作用.
确定Cys3636 S-化对肌肉收缩性,Ca2+处理和发育的影响.

主要方法:

使用Cys3636→Ala点突变在RyR1中的小鼠,以防止在该位点进行S-化.
评估刺激引起的Ca2+释放,Ca2+/calmodulin对RyR1进行调节,以及pO2合.
在体外评估骨肌细胞收缩性和体内评估肌肉强度.
分析了肌纤维直径,纤维亚型和与肌肉发育和缩相关的基因表达.

主要成果:

在正常肌肉功能期间,Cys3636被确定为内源性S-化的主要点.
缺少Cys3636 S-化抑制了Ca2+释放,改变了RyR1调节,消除了pO2合,并降低了肌肉收缩性和强度.
废除Cys3636 S-化导致发育缺陷,包括改变肌纤维大小,亚型分布和基因表达.

结论:

在Cys3636处RyR1的S-基化对骨肌的收缩性和发育有生理上的重要性.
在正常的肌肉功能中,RyR1的PO2合S-化起着至关重要的作用.
这些发现为研究肌肉疾病中的RyR1修饰提供了基础.

关键词:

激发 - 收缩合器肌肉缺氧肌肉缺氧氧化氧化是什么?瑞亚诺丁受体的受体这是一种S-nitrosothiol.萨科等离子体网膜.

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