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低温EM结构和分子动力学模拟解释了病理性Chaperonin突变的增强稳定性和ATP活性

Aiza Syed¹, Jihang Zhai², Baolin Guo²

¹Department of Molecular and Cellular Biochemistry, Indiana University Bloomington, 212 S. Hawthorne Dr., Bloomington, IN 47405, USA.

Structure (London, England : 1993)

|February 27, 2024

概括

人类线粒体上 Chaperonin Hsp60 (mHsp60) V72I 突变通过改变其结构来增强蛋白质的稳定性和活性. 这项冷EM研究揭示了mHsp60突变如何影响其基本细胞功能.

科学领域:

生物化学生物化学
分子生物学分子生物学
结构生物学结构生物学

背景情况:

像Hsp60s这样的Chaperonin是重要的ATP依赖分子机器,对于蛋白质折叠和细胞健康至关重要.
人类线粒体Hsp60 (mHsp60) 具有独特的结构和动态特性,与细菌GroEL不同,暗示了专门的功能.
一个先前确定的病理突变,mHsp60^V72I,显示了增加的亚单元结合稳定性和ATPase活性.

研究的目的:

阐明mHsp60^V72I突变的增强稳定性和活动的结构基础.
了解特定突变如何影响人类线粒体伴侣的结构动态和功能机制.

主要方法:

确定了mHsp60^V72I突变的冷电子显微镜 (cryo-EM) 结构.
进行了分子动态 (MD) 模拟,以分析结构变化和结合相互作用.
量化了子单位间接口,结合的自由能量和解离力的变化.

主要成果:

mHsp60^V72I结构显示了增加的子单元间接口,更高的结合自由能量和更大的解离力,证实了增强的子单元联结稳定性.
结构分析显示,mHsp60^V72I中的核酸结合 (NB) 门采用了开放的构造,促进了ATPase活动的增加.
MD模拟证实了冷EM发现,突出了V72I突变对mHsp60动态和功能的影响.

结论:

在mHsp60中的V72I突变通过特定的结构变化显著增强了其子单元结合稳定性和ATPase活性.
这些发现强调了mHsp60独特的结构特征在其生物功能中的关键作用,并提供了对Chaperonin机制的见解.

关键词:

这是一个 chaperonin 陪伴者.陪伴者是指随行者的进化.低温电磁波冷却器 (Cryo-EM) 是一个非常好的方法.遗传性性形 SPG13 人类线粒体的mHsp6060 mHsp60 分子动态模拟的分子动态模拟.

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