The intricate network between the p34 and p44 subunits is central to the activity of the transcription/DNA repair factor TFIIH.

The intricate network between the p34 and p44 subunits is central to the activity of the transcription/DNA repair factor TFIIH.
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DOI:
10.1093/nar/gkx743
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发表时间:
2017-10-13
影响因子:
14.9
通讯作者:
Kisker C
Kisker C
中科院分区:
生物学2区
文献类型:
--
作者:
Radu L;Schoenwetter E;Braun C;Marcoux J;Koelmel W;Schmitt DR;Kuper J;Cianférani S;Egly JM;Poterszman A;Kisker C

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通用转录因子 IIH (TFIIH) 是一种多蛋白复合物,其 10 个亚基参与复杂的蛋白质-蛋白质相互作用网络,对于调节其转录和 DNA 修复活性至关重要,迄今为止,人们对这些活性在分子水平上知之甚少。在这项研究中,我们重点关注 p44 和 p34 亚基,它们对于核心 TFIIH 的结构完整性至关重要。我们解析了来自嗜热毛壳菌和智人的 p34 N 端 vWA 和 p44 C 端锌结合结构域形成的复合物的晶体结构。有趣的是,我们的功能分析清楚地揭示了位于 p34 C 端锌结合区域的第二个界面的存在,它可以挽救 p34 vWA 和 p44 RING 结构域之间被破坏的相互作用。此外,我们证明 p34 的 C 端锌结合结构域对于 TFIIH 的稳定性和功能发挥着核心作用。我们的数据揭示了 core-TFIIH 内的冗余相互作用网络,这可能有助于最大限度地降低对突变损伤的敏感性。这提供了第一个见解,为什么迄今为止尚未发现 p34 或 p44 TFIIH 核心亚基中的突变会导致标志性核苷酸切除修复综合征(着色性干皮病或毛发硫营养不良)。
The general transcription factor IIH (TFIIH) is a multi-protein complex and its 10 subunits are engaged in an intricate protein–protein interaction network critical for the regulation of its transcription and DNA repair activities that are so far little understood on a molecular level. In this study, we focused on the p44 and the p34 subunits, which are central for the structural integrity of core-TFIIH. We solved crystal structures of a complex formed by the p34 N-terminal vWA and p44 C-terminal zinc binding domains from Chaetomium thermophilum and from Homo sapiens. Intriguingly, our functional analyses clearly revealed the presence of a second interface located in the C-terminal zinc binding region of p34, which can rescue a disrupted interaction between the p34 vWA and the p44 RING domain. In addition, we demonstrate that the C-terminal zinc binding domain of p34 assumes a central role with respect to the stability and function of TFIIH. Our data reveal a redundant interaction network within core-TFIIH, which may serve to minimize the susceptibility to mutational impairment. This provides first insights why so far no mutations in the p34 or p44 TFIIH-core subunits have been identified that would lead to the hallmark nucleotide excision repair syndromes xeroderma pigmentosum or trichothiodystrophy.
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