TRAIP是DNA跨链修复的一个主调节器
R Alex Wu1, Daniel R Semlow1, Ashley N Kamimae-Lanning2
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA.
Nature
|March 8, 2019
概括
TRAIP控制了DNA修复途径的选择. 它通过CMG基酶无处不在激活NEIL3糖酶或触发Fanconi贫血路径修复,确保基因组的稳定性.
科学领域:
- 分子生物学
- DNA 修复机制
- 细胞对DNA损伤的反应
背景情况:
- 通过阻断复制和转录,DNA链间交叉链 (ICL) 对基因组完整性构成重大威胁.
- 细胞使用不同的途径来修复ICL,而途径的选择会影响修复的可靠性和基因组不稳定性的可能性.
- 对于ICL修复途径,特别是NEIL3糖酶与Fanconi贫血途径的优先级仍然不清楚.
研究的目的:
- 阐明不同DNA跨链修复途径之间的调节机制.
- 确定E3无素连接酶TRAIP在复制合ICL修复中的作用.
- 了解TRAIP如何影响修复因子的招募和停滞不前的复制分叉的解决.
主要方法:
- 使用Xenopus蛋提取物研究与ICL的复制叉碰撞.
- 研究了TRAIP在CMG复制酶上的无处不在活性.
- 在不同的修复结果中分析了NEIL3的差异性招募和p97 ATPase的需求.
主要成果:
- 在NEIL3和Fanconi贫血修复途径中,TRAIP是必不可少的.
- TRAIP使CMG酶无处不在,短的无处不在链招募NEIL3,而较长的链则通过p97促进CMG卸载.
- 这种TRAIP的差异性无处不在决定了细胞在ICL的直接分裂或同类重组修复之间做出选择.
结论:
- TRAIP作为一个主调节器,控制ICL修复路径之间的切换.
- 对于解决与复制相关的DNA损伤,TRAIP对CMG无处不在和卸载的调节至关重要.
- 这些发现为DNA复制压力期间保持基因组稳定提供了关键的见解.
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