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-Structure paper
タイトル | XPD stalled on cross-linked DNA provides insight into damage verification. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Year 2024 |
掲載日 | 2024年5月28日 |
![]() | Jochen Kuper / Tamsanqa Hove / Sarah Maidl / Hermann Neitz / Florian Sauer / Maximilian Kempf / Till Schroeder / Elke Greiter / Claudia Höbartner / Caroline Kisker / ![]() |
PubMed 要旨 | The superfamily 2 helicase XPD is a central component of the general transcription factor II H (TFIIH), which is essential for transcription and nucleotide excision DNA repair (NER). Within these two ...The superfamily 2 helicase XPD is a central component of the general transcription factor II H (TFIIH), which is essential for transcription and nucleotide excision DNA repair (NER). Within these two processes, the helicase function of XPD is vital for NER but not for transcription initiation, where XPD acts only as a scaffold for other factors. Using cryo-EM, we deciphered one of the most enigmatic steps in XPD helicase action: the active separation of double-stranded DNA (dsDNA) and its stalling upon approaching a DNA interstrand cross-link, a highly toxic form of DNA damage. The structure shows how dsDNA is separated and reveals a highly unusual involvement of the Arch domain in active dsDNA separation. Combined with mutagenesis and biochemical analyses, we identified distinct functional regions important for helicase activity. Surprisingly, those areas also affect core TFIIH translocase activity, revealing a yet unencountered function of XPD within the TFIIH scaffold. In summary, our data provide a universal basis for NER bubble formation, XPD damage verification and XPG incision. |
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手法 | EM (単粒子) |
解像度 | 3.1 Å |
構造データ | EMDB-19109, PDB-8rev: |
化合物 | ![]() ChemComp-SF4: ![]() ChemComp-ADP: |
由来 |
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![]() | DNA BINDING PROTEIN / damaged DNA / helicase / XPD / NER / DNA repair / interstrand crosslink |