蛋白质氧化增加了SAMHD1通过其调节部位通过ssDNA的结合
Theresa L Simermeyer1, Stephanie Batalis1, LeAnn C Rogers1
1Department of Biochemistry, Wake Forest School of Medicine, Winston-Salem, NC, USA.
Nucleic acids research
|May 29, 2023
概括
氧化SAMHD1蛋白在S阶段增强其DNA结合,这表明它在DNA修复中的作用. 这种氧化作为一个开关,平衡其dNTPase活动与DNA结合功能.
科学领域:
- 分子生物学分子生物学
- 生物化学 生化学
- 细胞生物学 细胞生物学
背景情况:
- 无菌的α动机和含有蛋白质1 (SAMHD1) 的histidine-aspartate域是具有dNTP酶活性的关键酶.
- SAMHD1在病毒限制,细胞循环调节和天生的免疫力方面发挥着至关重要的作用.
- 最近针对SAMHD1.1发现了一种新的dNTPase独立功能,用于对DNA双链断裂的同源重组 (HR) 修复.
研究的目的:
- 调查翻译后修改,特别是氧化对SAMHD1功能的作用.
- 阐明SAMHD1参与DNA修复途径的机制.
- 确定氧化SAMHD1与单链DNA (ssDNA) 相互作用的结构基础.
主要方法:
- 生物化学测试以评估SAMHD1活性和ssDNA结合亲和力.
- 细胞周期分析以确定SAMHD1氧化的时间.
- 进行X射线晶体学,以确定氧化SAMHD1与ssDNA复合的结构.
主要成果:
- 氧化SAMHD1显著增加了它对ssDNA的亲和力.
- SAMHD1氧化以细胞周期依赖的方式发生,特别是在S阶段.
- 晶体结构揭示了氧化SAMHD1与位于二聚体接口的调节部位的ssDNA结合.
结论:
- 氧化SAMHD1作为调节开关,调节其dNTPase活动和DNA结合之间的功能.
- 细胞周期依赖的氧化和ssDNA结合表明SAMHD1在同源重组修复中的作用.
- 结构洞察力为SAMHD1的DNA结合是如何被氧化调节的提供了机械的理解.
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