The molecular mechanism of transcription-coupled DNA repair.

The molecular mechanism of transcription-coupled DNA repair.
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转录偶联DNA修复的分子机制。

DOI:
10.1016/j.tim.2007.05.005
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发表时间:
2007
影响因子:
15.9
通讯作者:
Savery NJ
Savery NJ
中科院分区:
生物学1区
文献类型:
--
作者:
Savery NJ

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阻断基因转录的DNA损伤优先通过转录偶联DNA修复途径进行修复。在DNA损伤处停滞的RNA聚合酶阻碍了修复酶,但是这种情况通过转录修复偶联因子而变得对细胞有利,所述转录修复偶联因子从DNA中去除停滞的RNA聚合酶并增加损伤修复的速率。最近对细菌转录修复偶联因子Mfd的结构研究揭示了一种模块化结构,其中ATP依赖性DNA马达与蛋白质-蛋白质相互作用结构域偶联,蛋白质-蛋白质相互作用结构域可以将马达连接到RNA聚合酶和DNA修复蛋白UvrA。在这里,我回顾了这种多功能蛋白质的主要特征,并讨论了最近的机制和结构研究结果如何推进我们对细菌中转录偶联DNA修复的理解。
DNA damage that blocks the transcription of genes is prioritized for repair by transcription-coupled DNA repair pathways. RNA polymerases stalled at DNA lesions obstruct repair enzymes, but this situation is turned to the advantage of the cell by transcription-repair coupling factors that remove the stalled RNA polymerase from DNA and increase the rate at which the lesion is repaired. Recent structural studies of the bacterial transcription-repair coupling factor, Mfd, have revealed a modular architecture in which an ATP-dependent DNA-based motor is coupled to protein–protein interaction domains that can attach the motor to RNA polymerase and the DNA repair protein UvrA. Here I review the key features of this multifunctional protein and discuss how recent mechanistic and structural findings have advanced our understanding of transcription-coupled DNA repair in bacteria.
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