通过VCP/p97从染色质中提取DNA聚合酶α/原酶,在不被干扰的DNA复制过程中限制ATR激活
Sara Rodríguez-Acebes1, Rodrigo Martín-Rufo2, Alicia Gómez-Moya2
1DNA Replication Group, Molecular Oncology Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.
Nature communications
|July 2, 2025
概括
AAA ATPase VCP/p97通过控制染色体上的DNA聚合酶α/Primase复合体 (POLA/PRIM) 来限制DNA复制. 抑制VCP/p97激活ATR和CHK1,导致细胞循环停止.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 复制应激反应对于保持基因组稳定性至关重要,它通过在DNA复制过程中管理障碍物来维持基因组稳定性.
- 基底激活ATR和CHK1激酶可以防止过度复制叉激活和基因组不稳定.
- 在不受干扰的S阶段调节ATR激活的机制需要进一步阐明.
研究的目的:
- 调查AAA ATPase VCP/p97在无扰 S 阶段调节ATR激活中的作用.
- 确定VCP/p97如何影响DNA聚合酶α/原酶复合体 (POLA/PRIM) 和ATR通路激活.
主要方法:
- 研究了VCP/p97和POLA/PRIM在染色质上的相互作用.
- 评估了VCP/p97抑制对ATR和CHK1激酶激活的影响.
- 在VCP/p97抑制后分析了细胞周期进展.
主要成果:
- VCP/p97调节了POLA/PRIM的染色体协会,从而限制了其活性.
- 抑制VCP/p97导致POLA/PRIM活性增加,并随后通过TOPBP1.1激活ATR.
- 抑制VCP/p97导致ATR和CHK1的激活和G2/M细胞周期的停止.
结论:
- 波拉/PRIM的原始活性是ATR在未被干扰的S阶段的基底激活的关键因素.
- 通过从染色质中提取POLA/PRIM,VCP/p97作为ATR激活的负调节剂.
- 准VCP/p97可能是一种操纵复制应激反应的策略.
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