Recruitment of UvrBC complexes to UV-induced damage in the absence of UvrA increases cell survival.

Recruitment of UvrBC complexes to UV-induced damage in the absence of UvrA increases cell survival.
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DOI:
10.1093/nar/gkx1244
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发表时间:
2018-02-16
影响因子:
14.9
通讯作者:
Kad NM
Kad NM
中科院分区:
生物学2区
文献类型:
--
作者:
Springall L;Hughes CD;Simons M;Azinas S;Van Houten B;Kad NM

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核苷酸切除修复(NER)是去除紫外线(UV)诱导的DNA光产物的主要机制,在所有生命王国中都是保守的。细菌NER涉及UvrA2和UvrB的损伤识别,然后是UvrC介导的损伤两侧的切口。在这里,使用体外和体内单分子研究的组合,我们表明,UvrBC复合物能够在UvrA的情况下进行病变识别。活细胞中eGFP标记的UvrB和UvrC的单分子分析表明,紫外线损伤导致这些蛋白质从细胞质扩散转变为DNA上的稳定复合物。令人惊讶的是,在uvrA缺失的菌株中UvrC的异位表达增加了UV存活。这些数据为以前未实现的生存机制提供了证据,该机制可以通过UvrBC复合物直接识别病变而发生。
Nucleotide excision repair (NER) is the primary mechanism for removal of ultraviolet light (UV)-induced DNA photoproducts and is mechanistically conserved across all kingdoms of life. Bacterial NER involves damage recognition by UvrA2 and UvrB, followed by UvrC-mediated incision either side of the lesion. Here, using a combination of in vitro and in vivo single-molecule studies we show that a UvrBC complex is capable of lesion identification in the absence of UvrA. Single-molecule analysis of eGFP-labelled UvrB and UvrC in living cells showed that UV damage caused these proteins to switch from cytoplasmic diffusion to stable complexes on DNA. Surprisingly, ectopic expression of UvrC in a uvrA deleted strain increased UV survival. These data provide evidence for a previously unrealized mechanism of survival that can occur through direct lesion recognition by a UvrBC complex.
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