UV radiation-induced XPC translocation within chromatin is mediated by damaged-DNA binding protein, DDB2.

UV radiation-induced XPC translocation within chromatin is mediated by damaged-DNA binding protein, DDB2.
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紫外线辐射诱导的染色质内 XPC 易位是由受损的 DNA 结合蛋白 DDB2 介导的。

DOI:
10.1093/carcin/bgh085
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发表时间:
2004
期刊:
影响因子:
4.7
通讯作者:
Wani,AltafA
Wani,AltafA
中科院分区:
医学2区
文献类型:
--
作者:
Wang,Qi-En;Zhu,Qianzheng;Wani,Gulzar;Chen,Jianming;Wani,AltafA

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肿瘤抑制蛋白p53已被确定为调节整体基因组修复效率的重要因素。我们最近在人类细胞中的修复研究报道,p53调节XPC和TFIIH蛋白到特定DNA损伤位点的募集。在这里,我们研究了p53和受损DNA结合复合物(DDB2)蛋白对XPC在受损染色质体内分布的影响,以及XPC在DNA损伤位点的原位募集。结果表明,紫外线照射导致XPC从松散的结合形式移位到与染色质蛋白紧密结合的形式。在p53缺陷和DDB2缺陷的人细胞中,UV辐射诱导的XPC再分布同样受到损害。同样,XPC对DNA损伤的快速募集在两种细胞系中也受到损害。DDB2在p53缺陷细胞中的异位表达克服了在体内UV诱导的XC易位对p53功能的要求。DDB2功能的恢复也增强了XPC在DNA损伤位点的原位募集,并增加了基因组中环丁烷嘧啶二聚体的整体修复。这些结果表明,DDB2是p53的关键下游因子,调节XPC在辐射细胞中的DNA损伤的运动。
The tumor suppressor p53 protein has been established as an important factor in modulating the efficiency of global genomic repair. Our recent repair studies in human cells reported that p53 regulates the recruitment of XPC and TFIIH proteins to specific DNA damage sites. Here, we have examined the influence of p53 and damaged-DNA binding complex (DDB2) proteins on the distribution of XPC within damaged chromatinin vivoand the recruitment of XPC to DNA damage sitesin situ. The results show that UV irradiation causes the translocation of XPC from a loosely bound form into a tight association with chromatinin vivo. The UV radiation-induced redistribution of XPC was equally compromised in p53-deficient, as well as DDB2-deficient, human cells. Similarly, rapid recruitment of XPC to DNA damagein situwas also impaired in both cell lines. Ectopic expression of DDB2 in p53-deficient cells overcame the requirement of p53 function for UV-induced translocation of XPCin vivo. Restoration of DDB2 function also enhanced the recruitment of XPC to DNA damage sitesin situand increased the global repair of cyclobutane pyrimidine dimer from the genome. These results indicate that DDB2 is a key downstream factor of p53 for regulating the movement of XPC to DNA damage in irradiated cells.
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