REV7与ATRIP相关,并抑制ATR激酶活性
bioRxiv : the preprint server for biology
|January 27, 2025
概括
DNA修复蛋白REV7直接与ATRIP结合,抑制ATR信号传递. 这一发现揭示了REV7作为DNA损伤反应的关键负调节器,对基因组稳定性至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 基因组稳定性通过DNA复制,修复和细胞周期进展的整合来维持.
- ATAXIA-telangiectasia突变并与RAD3相关的 (ATR) 激酶及其伴侣ATR相互作用蛋白 (ATRIP) 是DNA损伤反应 (DDR) 中的一个中心传感器.
- 虽然ATR激活得到了充分的研究,但ATR信号负调节的机制仍然不太了解.
研究的目的:
- 为了确定ATR信号传输的新型调节器.
- 研究DNA修复蛋白REV7在ATR通路调节中的作用.
- 为了阐明REV7与ATR-ATRIP复合体之间的相互作用.
主要方法:
- 共同免疫沉以确定蛋白质相互作用.
- 定位导向突变发生以确定相互作用动机.
- 在体外激酶测试以评估ATR活性.
- 在完整的细胞中对基质酸化的分析.
主要成果:
- REV7被确定为ATRIP的直接有约束力的合作伙伴.
- 在ATRIP中特征了一种特定的REV7相互作用动机,它的突变破坏了相互作用.
- 在实验室中,REV7抑制了像p53这样的基质的ATR介导酸化.
- 破坏REV7-ATRIP相互作用会增加细胞中Ser317的CHK1酸化.
结论:
- REV7作为ATR信号的直接负调节器.
- REV7与ATRIP的相互作用对其抑制功能至关重要.
- REV7在整合多个基因组维护途径中发挥着重要作用,包括DDR.
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