在检查点激活过程中,PP2A酸酶对抗911轴的功能
Erika Casari1, Paolo Pizzul1, Carlo Rinaldi1
1Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca, 20126 Milano, Italy.
Cell reports
|November 26, 2023
概括
通过Cdc55和Tpd3子单元,PP2A酸酶抑制了DNA损伤反应信号传递. 它的缺失导致DNA损伤敏感性和细胞循环停止,因为它阻止了9-1-1轴的激活.
科学领域:
- 细胞生物学 细胞生物学
- 分子遗传学 分子遗传学
- DNA 修复机制的修复机制
背景情况:
- 通过Mec1/ATR和Rad53/CHK2激酶介导的检查点反应触发DNA损伤.
- 9-1-1复合体及其相关蛋白质 (9-1-1轴) 对于激活Rad53.3至关重要.
- 酸酶在调节DNA损伤检查点中的作用尚未完全理解.
研究的目的:
- 研究PP2A酸酶子单元Cdc55和Tpd3在调节DNA损伤反应中的作用.
- 阐明PP2A对抗911轴激活的机制.
- 了解PP2A功能障碍对DNA损伤敏感性和修复的后果.
主要方法:
- 在Saccharomyces cerevisiae中利用了功能丧失和高形态突变.
- 分析了DNA损伤的敏感性,细胞周期停止的持续时间和DNA双链断裂切除.
- 研究了蛋白质与蛋白质的相互作用,特别是Cdc55-Ddc1和Ddc1-Dpb11复合体的形成.
主要成果:
- PP2A子单元Cdc55和Tpd3的损失导致对DNA损伤的敏感性和长时间的细胞循环停止.
- PP2A对抗911轴,抑制Rad53的激活. PP2A对抗911轴,抑制Rad53的激活.
- Cdc55阻止DPb11对化Ddc1 (Thr602) 的识别,从而抑制Ddc1-DPb11复合体的形成.
结论:
- PP2A酸酶作为DNA损伤检查点的负调节剂.
- Cdc55与Ddc1的相互作用对于抑制9-1-1轴和保持基因组稳定性至关重要.
- 这种PP2A介导检查点抑制的失调有助于DNA修复缺陷.
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