6TRS

Crystal structure of TFIIH subunit p52 in complex with p8

6TRS の概要

• エントリーDOI: 10.2210/pdb6trs/pdb
• 分子名称: RNA polymerase II transcription factor B subunit 2, Uncharacterized protein (2 entities in total)
• 機能のキーワード: tfiih, dna repair, transcription
• 由来する生物種: Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719); 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 104054.01

構造登録者

Koelmel, W.,Kuper, J.,Schoenwetter, E.,Kisker, C. (登録日: 2019-12-19, 公開日: 2020-10-21, 最終更新日: 2024-05-15)

主引用文献

Kappenberger, J.,Koelmel, W.,Schoenwetter, E.,Scheuer, T.,Woerner, J.,Kuper, J.,Kisker, C.
How to limit the speed of a motor: the intricate regulation of the XPB ATPase and translocase in TFIIH.
Nucleic Acids Res., 48:12282-12296, 2020

PubMed Abstract: The superfamily 2 helicase XPB is an integral part of the general transcription factor TFIIH and assumes essential catalytic functions in transcription initiation and nucleotide excision repair. The ATPase activity of XPB is required in both processes. We investigated the interaction network that regulates XPB via the p52 and p8 subunits with functional mutagenesis based on our crystal structure of the p52/p8 complex and current cryo-EM structures. Importantly, we show that XPB's ATPase can be activated either by DNA or by the interaction with the p52/p8 proteins. Intriguingly, we observe that the ATPase activation by p52/p8 is significantly weaker than the activation by DNA and when both p52/p8 and DNA are present, p52/p8 dominates the maximum activation. We therefore define p52/p8 as the master regulator of XPB acting as an activator and speed limiter at the same time. A correlative analysis of the ATPase and translocase activities of XPB shows that XPB only acts as a translocase within the context of complete core TFIIH and that XPA increases the processivity of the translocase complex without altering XPB's ATPase activity. Our data define an intricate network that tightly controls the activity of XPB during transcription and nucleotide excision repair.

PubMed: 33196848
DOI: 10.1093/nar/gkaa911

実験手法

X-RAY DIFFRACTION (2.68 Å)