HPF1补充了DNA损伤诱导的ADP-ribosylation的PARP活性位点
Marcin J Suskiewicz1, Florian Zobel1, Tom E H Ogden2
1Sir William Dunn School of Pathology, University of Oxford, Oxford, UK.
Nature
|February 7, 2020
概括
HPF1与PARP1/PARP2形成一个复合活性位点,该位点对于通过血清ADP-ribosylation修复DNA损伤至关重要. 这种相互作用对细胞对DNA损伤和临床PARP抑制剂的反应至关重要.
科学领域:
- 生物化学
- 分子生物学
- 遗传学
背景情况:
- 聚ADP- 核糖酶1 (PARP1) 和PARP2是DNA损伤的关键反应体.
- 它们通过ADP- 核糖信号修改蛋白质,帮助染色体分解和修复因子的招募.
- 血清连接的修改需要HPF1,这改变了PARP1/PARP2对DNA损伤反应的特异性.
研究的目的:
- 阐明HPF1在PARP介导的DNA损伤反应中的结构和功能作用.
- 研究涉及HPF1和PARP酶的复合活性部位的形成.
- 了解HPF1-PARP相互作用对DNA损伤的反应.
主要方法:
- 与PARP2的催化域对HPF1的同结构确定.
- 核磁共振 (NMR) 光谱学
- 生物化学测试以评估酶活性和相互作用.
主要成果:
- 由HPF1和PARP1/PARP2残留物形成的复合活性位点被发现.
- 这种催化中心对于ADP-ribose添加后的DNA损伤至关重要.
- 在DNA损伤和NAD+结合时,Allosteric网络增强HPF1-PARP相互作用,调节DNA损伤反应.
结论:
- HPF1是形成PARP1和PARP2活性部位的组成部分,用于修复DNA损伤.
- 在细胞对DNA损伤的反应中,HPF1起着至关重要的作用.
- 在复合活性位点中HPF1的作用涉及临床PARP抑制剂的疗效.
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