通过人类ssDNA结合蛋白-1的氧依赖凝结和细胞质颗粒分离在氧化应激反应中的角色被划分出来
Gábor M Harami1, János Pálinkás1, Zoltán J Kovács1,2
1ELTE-MTA "Momentum" Motor Enzymology Research Group, Department of Biochemistry, Eötvös Loránd University, Pázmány P. s. 1/c, 1117 Budapest, Hungary.
iScience
|September 17, 2024
概括
人类单链DNA结合蛋白1 (hSSB1) 形成了与DNA/RNA有着独特的,氧还原敏感的凝聚物,对于DNA修复和细胞应激反应至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 人类单链DNA结合蛋白1 (hSSB1) 对于DNA修复途径至关重要.
- 液-液相分离 (LLPS) 是细胞组织的一个新兴机制.
研究的目的:
- 研究hSSB1的生物物理性质和细胞功能,特别是其相分离潜力.
- 阐明hSSB1凝聚物在DNA修复和细胞应激反应中的作用.
主要方法:
- 净化hSSB1蛋白质. 净化hSSB1蛋白质. 净化hSSB1蛋白质. 净化hSSB1蛋白质. 净化hSSB1蛋白质.
- 实验室试验用核酸研究依赖氧化还原的LLPS.
- 在氧化应激下细胞系中进行显微镜和同局部化研究.
主要成果:
- 纯化的hSSB1经历了与ssDNA/RNA的氧化还原依赖LLPS,在模仿氧化应激的生理条件下形成核蛋白滴.
- hSSB1的内在无序区域和特定的半氨酸残留物对于LLPS和氧化还原敏感性至关重要.
- hSSB1凝聚物选择性地招募相互作用的蛋白质,并且存在于细胞质中,在氧化应激过程中与应激颗粒共定位.
结论:
- hSSB1形成独特的,受调节的凝聚物,在核基因组修复和对氧化应激的核外细胞质防御中发挥作用.
- 这些发现揭示了hSSB1的新型凝结相关功能,弥合了基因组完整性和细胞应激管理.
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