有证据表明酵母Pol ε和PCNA之间的功能相互作用 in vivo
Noopur Singh1, Roni Odai2, Ulf Persson1
1Department of Medical Biochemistry and Biophysics, Umeå University, 901 87 Umeå, Sweden.
Nucleic acids research
|December 17, 2025
概括
增殖细胞核抗原 (PCNA) 在复制过程中增强了DNA聚合酶epsilon (Pol ε) 的过程性. 破坏Pol ε-PCNA相互作用会在延长主链合成时减缓生长,揭示PCNA.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生化学
背景情况:
- DNA复制需要蛋白质协调,特别是涉及增殖细胞核抗原 (PCNA),一个滑动.
- PCNA与DNA聚合酶delta (Pol δ) 和epsilon (Pol ε) 相互作用,这对DNA合成至关重要.
- 在体内,Pol ε-PCNA相互作用的作用,特别是在主导链合成中,尚未完全理解.
研究的目的:
- 为了研究酵母Pol ε和PCNA之间的相互作用的体内功能意义.
- 阐明特定的相互作用点及其对DNA复制的重要性.
主要方法:
- 使用AlphaFold进行PCNA和酵母Pol ε复合体形成的in silico建模.
- 产生了具有突变破坏已识别的Pol ε-PCNA相互作用接口的酵母菌株.
- 进行生物化学测试以验证相互作用中断并评估 in vivo 的功能后果.
主要成果:
- AlphaFold模型预测了Pol ε和PCNA之间的两个相互作用点:P域和PIP盒.
- 生物化学测试证实PIP盒是关键的,P域是二次相互作用的地点.
- 缺乏PCNA相互作用的突变体在野生类型酵母中没有表型,但表现出较慢的生长速度和延长的领先链合成.
结论:
- 在体外和体内,PCNA增强了Pol ε的过程性.
- 在有限的复制起源条件下,Pol ε-PCNA相互作用对于高效的领先链合成很重要.
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