Common TFIIH recruitment mechanism in global genome and transcription-coupled repair subpathways.

Common TFIIH recruitment mechanism in global genome and transcription-coupled repair subpathways.
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DOI:
10.1093/nar/gkx970
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发表时间:
2017-12-15
影响因子:
14.9
通讯作者:
Nishimura Y
Nishimura Y
中科院分区:
生物学2区
文献类型:
--
作者:
Okuda M;Nakazawa Y;Guo C;Ogi T;Nishimura Y

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核苷酸切除修复由两种不同的损伤识别子途径启动,即全局基因组修复(GGR)和转录偶联修复(TCR)。在GGR中,XPC检测DNA损伤并通过与TFIIH亚基p62的普列克底物蛋白同源(PH)结构域相互作用募集TFIIH。在TCR中,RNA聚合酶II的延伸形式检测转录链上的损伤并通过未知机制募集TFIIH。我们发现TCR起始因子UVSSA与p62的PH结构域通过UVSSA中心区域的短酸性串形成稳定的复合物,并通过NMR确定了复合物的结构。UVSSA的酸性串通过将Phe408和Val411插入两个口袋中而与PH结构域的碱性沟强烈结合,这与XPC与p62的相互作用机制高度相似。突变结合分析验证了结构并鉴定了对结合至关重要的残基。TCR活性显着降低,在UVSSA缺陷细胞表达UVSSA突变Phe408或Val411。因此,TCR中的UVSSA和GGR中的XPC共享共同的TFIIH募集机制。
Nucleotide excision repair is initiated by two different damage recognition subpathways, global genome repair (GGR) and transcription-coupled repair (TCR). In GGR, XPC detects DNA lesions and recruits TFIIH via interaction with the pleckstrin homology (PH) domain of TFIIH subunit p62. In TCR, an elongating form of RNA Polymerase II detects a lesion on the transcribed strand and recruits TFIIH by an unknown mechanism. Here, we found that the TCR initiation factor UVSSA forms a stable complex with the PH domain of p62 via a short acidic string in the central region of UVSSA, and determined the complex structure by NMR. The acidic string of UVSSA binds strongly to the basic groove of the PH domain by inserting Phe408 and Val411 into two pockets, highly resembling the interaction mechanism of XPC with p62. Mutational binding analysis validated the structure and identified residues crucial for binding. TCR activity was markedly diminished in UVSSA-deficient cells expressing UVSSA mutated at Phe408 or Val411. Thus, a common TFIIH recruitment mechanism is shared by UVSSA in TCR and XPC in GGR.
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