非催化 DNA 聚合酶 ε 子单元是 NPF 模式识别蛋白质
Salla Keskitalo1, Boglarka Zambo2,3, Dicle Malaymar Pinar1
1Institute of Biotechnology, Helsinki Institute of Life Science HiLIFE, University of Helsinki, Helsinki, Finland.
Nature communications
|December 13, 2025
概括
人类DNA聚合酶epsilon (POLE2) 的非催化子单元作为Asn-Pro-Phe (NPF) 动机的受体,结合参与DNA复制和修复的各种蛋白质.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 遗传学 是一个
背景情况:
- 在无序的蛋白质区域中,短线性动图 (SLiM) 调解了关键的蛋白质-蛋白质相互作用.
- Asn-Pro-Phe (NPF) 基因被认为是EH域蛋白的配体,主要参与内细胞分裂.
- 大多数SLiM的功能,包括NPF图案,仍然在很大程度上没有特征.
研究的目的:
- 研究人类DNA聚合酶epsilon (POLE2) 的非催化子单元作为NPF动机的受体的潜力.
- 通过NPF动机识别与POLE2相互作用的新型蛋白伴侣.
- 阐明POLE2-NPF相互作用的分子机制和生物学影响.
主要方法:
- 定量"原生延迟"试验,以评估POLE2-结合.
- 生物化学测量和突变分析以确定相互作用地点.
- 预测AlphaFold结构,以确定参与动图结合的关键残留物.
- 蛋白质基因尺度亲和力查以确定内源性含有NPF的结合伙伴.
主要成果:
- POLE2可选择性地结合多种含有NPF的,包括已知的EH域配体和新型基因.
- 基基因与POLE2的C端附近的浅口袋相互作用,其残留物Y513,E520和S522发挥着关键作用.
- 蛋白质基质尺度的幕识别了像WDHD1,DONSON和TTF2这样的核蛋白,这些蛋白通过NPF基因结合POLE2.
- 这些基因中的突变消除了细胞提取物中的POLE2结合.
结论:
- POLE2 作为一般的 NPF 基因受体起作用,扩大其已知的作用超出了 DNA 复制的范围.
- POLE2可以招募各种参与DNA修复和转录调节的NPF载体蛋白质,表明其作为分子枢纽的作用.
- 通过POLE2广泛识别NPF动机,突显了SLiM介导的交互网络的固有退化及其将多种细胞过程连接在一起的潜力.
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