非共价PAR结合指导蛋白质到PARP1-介导的PARylation
Arthur Fischbach1,2, Klara Bangert2, Alexander Bürkle2
1Max Planck Institute for Biology of Ageing, Molecular Genetics of Ageing Department, 50931 Cologne, Germany.
ACS chemical biology
|March 13, 2026
概括
聚ADP-ribosyl化 (PARylation) 是由蛋白质与聚ADP-ribose (PAR) 结合的方式来调节的. 不同的结合模式影响了共价PARylation的效率,影响细胞过程.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 多ADP-ribosyl) 化 (PARylation) 是一种由多ADP-ribose) 聚合酶 (PARPs) 介导的关键的翻译后修饰.
- PARylation调节关键的细胞过程,包括DNA损伤反应,转录和细胞死亡.
- 在此之前,PAR和p53 C端域 (CTD) 的内在失序区域 (IDPR) 之间的非共价相互作用被证明可以调解PARP1依赖的共价修饰.
研究的目的:
- 调查非对应性 PAR 与 IDPR 结合的机制是否适用于其他领域,包括 FUS 蛋白质的 RGG IDPR.
- 在缺乏IDPR的域中检查PARylation效率,例如WWE,PBZ和宏观域.
- 了解不同的PAR结合模式如何影响共价PARylation效率.
主要方法:
- 使用化学生物学方法,使用光标记的NAD+模拟物.
- 采用了含有定义的ADP-ribose结合域和验证的PARylation受体的融合结构.
- 在各种蛋白质域中评估PARylation效率.
主要成果:
- 在p53-CTD,RGG,WWE和PBZ域中,表现出高效的共价PARylation.
- 通过巨蛋白Af1521结合,导致PARylation显著减弱.
- 发现PAR结合的模式影响了蛋白质共价PARylation的效率.
结论:
- 非共价PAR与IDPR结合的机制扩展到其他领域,但效率各不相同.
- 独特的PAR结合模式在引导蛋白质向共价PARylation中发挥着关键作用.
- 这项研究增强了对PARylation机制的分子理解,并建议针对PAR信号的潜在治疗策略.
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