在S.S.内的ATP水解驱动的结构转变. 脑膜细胞中的Rad51和Dmc1核蛋白丝
Yeonoh Shin1, Stefan Y Kim1, Eric C Greene1
1Department of Biochemistry & Molecular Biophysics, Columbia University Irving Medical Center, New York, NY, 10032, USA.
bioRxiv : the preprint server for biology
|April 1, 2025
概括
对Rad51和Dmc1光纤拆解的结构洞察力揭示了ATP对ADP的水解如何调节DNA重组酶功能,这对基因组稳定性和遗传多样性至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 结构生物学 结构生物学
背景情况:
- 同源重组 (HR) 维持了基因组的稳定性,并产生了遗传多样性.
- Rad51和Dmc1是关键的ATP依赖DNA重组酶,形成HR必不可少的核蛋白丝.
- 导线稳定性由ATP结合和水解来调节,影响组装和拆卸.
研究的目的:
- 为了阐明Rad51和Dmc1光纤拆卸的结构机制.
- 为了比较这些重组酶的ADP结合结构与ATP结合纤维.
- 提出一个模型,说明ATP水解过程中的结构变化如何驱动丝的拆卸.
主要方法:
- 使用冷电子显微镜 (CryoEM) 确定了Saccharomyces cerevisiae Rad51和Dmc1.1的结构.
- 对于两种重组的ADP-bound状态,获得了结构.
- 在ADP结合和ATP结合的纤维之间进行了详细的结构比较.
主要成果:
- 确定了ADP结合的Rad51和Dmc1纤维的详细的冷EM结构.
- 确定了ATP结合和ADP结合的纤维之间的结构差异.
- 我们了解了伴随ATP水解的构造变化.
结论:
- 这项研究提供了在Rad51和Dmc1纤维的ATP水解过程中发生的转换到ADP的结构证据.
- 研究结果表明,一种机制将结构变化与核蛋白丝拆卸联系起来.
- 这项工作增强了对同源重组途径调节的理解.
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