D型环林在调节DNA不匹配修复中的CDK独立作用
Gergely Rona1, Bearach Miwatani-Minter2, Qingyue Zhang2
1Department of Biochemistry and Molecular Pharmacology, NYU Grossman School of Medicine, New York, NY 10016, USA; Laura and Isaac Perlmutter Cancer Center, NYU Grossman School of Medicine, New York, NY 10016, USA; Howard Hughes Medical Institute, NYU Grossman School of Medicine, New York, NY 10016, USA.
Molecular cell
|March 8, 2024
概括
D型环林和p21通过防止MMR蛋白与PCNA结合,抑制G0/G1中的DNA不匹配修复 (MMR). 它们在G1/S的降解使MMR能够发挥作用,防止突变和微卫星的不稳定.
科学领域:
- 分子生物学分子生物学
- 细胞循环规则 细胞循环规则
- 修复DNA修复DNA的修复
背景情况:
- 不匹配修复 (MMR) 纠正DNA复制错误,但在G0/G1阶段可能容易出现错误.
- 在细胞周期早期阶段控制MMR活性的机制尚未完全理解.
研究的目的:
- 阐明在细胞周期G0和G1阶段控制DNA不匹配修复 (MMR) 的调节机制.
- 研究D型环林和p21在调节MMR活性中的作用及其对基因组稳定性的影响.
主要方法:
- 使用哺乳动物细胞培养模型.
- 使用诸如共免疫沉和西式涂抹等技术研究了蛋白质相互作用.
- 评估DNA损伤反应和修复途径.
- 分析了细胞周期进展和蛋白质降解动态.
主要成果:
- D型循环素以PCNA和p21依赖的方式被招募到氧化DNA损伤部位.
- D型环林稳定p21,然后抑制MMR蛋白与PCNA结合,从而抑制MMR.
- 这种抑制是独立于CDK4/CDK6的,并且在G0/G1.1中保留.
- 在G1/S过渡时,D型环林和p21通过库林-RING泛素酶 (CRL) 的降解恢复了MMR.
- 在S阶段持续的D型环林表达增加了突变率和微卫星不稳定性.
结论:
- D型环林和p21作为关键调节剂,抑制G0/G1中的MMR,以防止潜在的错误.
- 及时降解D型环林和p21对于G1/S过渡时的MMR激活至关重要,确保精确的DNA复制和基因组完整性.
- 这种途径的失调,特别是持续的D型环林表达,有助于增加突变发生和微卫星不稳定性.
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