病原性突变会损害Hsp60在单体和小分子状态中的功能动态
Luca Torielli1, Federica Guarra1, Hao Shao2
1Department of Chemistry, University of Pavia, Pavia, Italy.
Nature communications
|April 3, 2025
概括
热冲击蛋白60 (Hsp60) 中的V72I突变使其结构刚硬,影响客户端蛋白折叠. 这项研究使用分子动力学来揭示突变如何影响Hsp60组装动力学和全调节.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 线粒体热冲击蛋白60 (Hsp60) 和它的辅因子HSP10对于蛋白质折叠至关重要.
- Hsp60形成各种寡合态 (单体,单环,双环,足球形复合体) 以促进客户端蛋白质的加工.
- 在HSP60中V72I突变,与遗传性性 SPG13相关,尽管距离活性部位很远,但功能受损.
研究的目的:
- 调查V72I Hsp60突变引起的功能障碍背后的分子机制.
- 阐明V72I突变如何影响Hsp60组件的动态和性调节.
主要方法:
- 使用了原子分子动力学 (MD) 模拟.
- 模拟包括野生型 (WT) 和V72I突变Hsp60在单体,单环,双环和足球形状的复杂形式.
- 双环和足球状复合物的催化酸盐在各种质子化状态下被研究,包括水解后的状态.
主要成果:
- 发现V72I突变使Hsp60组件变硬,与实验观察一致.
- 观察到对Hsp60结构内部动态的显著影响.
- 在单体中,V72I突变创建了一个独立于ATP结合部位的新性通路,改变了反应性.
结论:
- V72I突变对Hsp60产生了硬化作用,破坏了其正常的形状动态.
- 在V72I突变Hsp60单体中新发现的一种全性路径表明了复杂的调节机制.
- 这些发现为SPG13中的Hsp60功能障碍提供了原子层面的见解,并可能指导未来的实验调查.
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