整合子单元INTS12将核糖毒性压力与转录合核酸切除修复联系起来
Zhuo Li1, Ran Li1,2, Min Yang1
1Zhejiang Key Laboratory of Molecular Cancer Biology, Life Sciences Institute, Zhejiang University, Hangzhou, China.
Nature structural & molecular biology
|February 26, 2026
概括
整合器复合体子单元INTS12将RNA损伤反应与DNA修复联系起来. 这一途径对于紫外线损伤后的转录合核酸切除修复 (TC-NER) 至关重要,增强了基因组完整性.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 细胞采用转录合核酸切除修复 (TC-NER) 来修复阻断转录的DNA病变,这种病变通常是由紫外线辐射等基因毒剂引起的.
- 紫外线辐射也会损害RNA,启动细胞质核核糖核毒应激反应 (RSR),但其与核TC-NER的联系是未知的.
研究的目的:
- 为了研究带带毒性应激反应 (RSR) 和转录合核酸切除修复 (TC-NER) 之间的联系.
- 确定关键的分子参与者,调解RNA损伤信号和DNA修复途径之间的通信.
主要方法:
- 研究了集成器复合体子单元INTS12在将RSR与TC-NER连接中的作用.
- 利用涉及ZAK和CSB的信号通路来了解INTS12酸化及其与停滞的RNA聚合酶II (Pol II) 的相互作用.
- 研究了破坏INTS12通路对TC-NER效率和细胞紫外线敏感性的影响.
主要成果:
- 确定INTS12作为连接RSR与TC-NER的关键调解器.
- 通过RSR激活的ZAK信号酸盐INTS12,增强其与CSB的结合,并促进集成者复合物的招募到停滞的Pol II.
- 这一过程促进了Pol II的清除,使TC-NER和转录恢复有效,破坏导致紫外线敏感性增加.
- 由INTS12介导的Pol II去除是特定于环境的,对于甲诱导的DNA-蛋白质交叉连接修复并不必不可少.
结论:
- 发现了一个调节轴,其中RNA损伤信号 (RSR) 通过INTS12影响核DNA修复 (TC-NER).
- 通过将细胞质应激反应与核修复机制联系起来,证明了INTS12在维护基因组完整性方面的上下文依赖作用.
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