3'dNTP结合在人类PrimPol的Primer合成和转化过程中受到调节
Cristina Velázquez-Ruiz1, Luis Blanco1, María Isabel Martínez-Jiménez1
1Centro de Biología Molecular Severo Ochoa, (CSIC-UAM), c/Nicolás Cabrera 1, Cantoblanco, 28049 Madrid, Spain.
International journal of molecular sciences
|January 11, 2024
概括
人类PrimPol (HsPrimPol) 是一种DNA原酶/聚合酶,它使用特定的残留物来稳定脱氧核化物 (dNTPs),以便在复制分叉进展和避免损伤过程中高效地合成DNA原料.
科学领域:
- 分子生物学分子生物学
- 酶学 是一种酶学.
- 复制DNA复制DNA复制DNA复制
背景情况:
- 普里姆波尔是一种DNA原酶/聚合酶,属于古真核原酶 (AEP) 超级家族.
- 它通过合成DNA原始剂来促进停滞的复制分叉进展.
- 普林波尔的活性部位包括三个保存的图案 (A,B,C) 和额外的残留物.
研究的目的:
- 阐明在DNA原料合成过程中人类PrimPol (HsPrimPol) 中关键残留物的特定作用.
- 了解单个配体如何促进脱氧核酸 (dNTP) 结合和稳定.
- 调查PrimPol在复制分叉进展和损伤避免中的功能.
主要方法:
- 在特定的PrimPol残留物 (His169,Ser167,Lys297,Lys165,Lys300) 的位点定向突变发生.
- 测试用于测量原酶和聚合酶活动.
- 脱氧核酸 (dNTP) 结合和稳定性的分析.
- 评估PrimPol在原料模板调整中的作用,以避免损坏.
主要成果:
- 希斯169对于dNTP结合和原酶/聚合酶活动至关重要.
- 赛尔167和莱斯297对于原料合成的启动而不是延长至关重要.
- 165对于原酶功能是不可或缺的,但对于避免损伤是必需的.
- 300作为一个额外的残留物来稳定传入的dNTPs.
结论:
- 在HsPrimPol中的单个配体调节3'输入的dNTP稳定.
- 这些调制优化了在启动和成熟期间的DNA原始合成效率.
- HsPrimPol的独特残留物有助于复制重启和DNA损伤耐受机制.
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