稳定的氧化后翻译修饰改变了RyR1的关门特性
Maarten M Steinz1, Nicole Beard2, Emily Shorter1
1Department of Physiology and Pharmacology, Molecular Muscle Physiology and Pathophysiology lab, Karolinska Institutet, Stockholm, Sweden.
稳定的氧化修饰,如3-甲和甲添加物,增加了氨酸受体1型 (RyR1) 开放的概率,影响骨肌肉功能. 这些发现澄清了RyR1在氧化应激条件下的关口.
科学领域:
- 肌肉生理学 肌肉生理学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 氨酸受体1型 (RyR1) 通过调节来自质网膜的Ca2+释放来控制骨肌肉收缩.
- 像化和S-化这样的翻译后修改 (PTM) 增加了RyR1的开放概率 (Po),导致Ca2+泄漏和肌肉功能障碍在各种疾病和衰老中.
- 稳定的氧化修饰,特别是3-甲酸 (3-NT) 和甲酸 (MDA) 添加物的对RyR1门的影响以前尚不清楚.
研究的目的:
- 为了研究稳定的氧化修饰,3-NT和MDA如何改变RyR1通道关口和功能.
- 为了识别RyR1上由3-NT和MDA修饰的特定残留物.
- 了解这些修改对RyR1与FKBP12相互作用的影响.
主要方法:
- 使用质谱测量来识别修改后的RyR1残留物.
- 使用单通道记录来测量RyR1的开放概率 (Po).
- 分析了3-NT和MDA对RyR1关口和FKBP12结合的影响.
主要成果:
- 无论是3-NT和MDA修改都以剂量依赖的方式增加了RyR1 Po.
- 质谱仪在RyR1上发现了30个修饰后的残留物,包括SPRY1,SPRY2&3和JSol领域的关键部位.
- 这些修改促进了FKBP12与RyR1的分离,尽管没有直接重叠的FKBP12结合点.
结论:
- 稳定的氧化PTMs,包括3-NT和MDA,通过增加Po.显著改变RyR1通道门通过增加Po.
- 关键RyR1域中的特定修改会影响蛋白相互作用,例如FKBP12结合.
- 这些发现增强了对RyR1功能障碍在涉及氧化应激和肌肉衰弱的条件下的理解.
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