A scanning-to-incision switch in TFIIH-XPG induced by DNA damage licenses nucleotide excision repair
Journal Article
·
· Nucleic Acids Research
- King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
- University of Texas MD Anderson Cancer Center, Houston, TX (United States)
- Georgia State Univ., Atlanta, GA (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of Texas MD Anderson Cancer Center, Houston, TX (United States)
Nucleotide excision repair (NER) is critical for removing bulky DNA base lesions and avoiding diseases. NER couples lesion recognition by XPC to strand separation by XPB and XPD ATPases, followed by lesion excision by XPF and XPG nucleases. Here, we describe key regulatory mechanisms and roles of XPG for and beyond its cleavage activity. Strikingly, by combing single-molecule imaging and bulk cleavage assays, we found that XPG binding to the 7-subunit TFIIH core (coreTFIIH) stimulates coreTFIIH-dependent double-strand (ds)DNA unwinding 10-fold, and XPG-dependent DNA cleavage by up to 700-fold. Simultaneous monitoring of rates for coreTFIIH single-stranded (ss)DNA translocation and dsDNA unwinding showed XPG acts by switching ssDNA translocation to dsDNA unwinding as a likely committed step. Pertinent to the NER pathway regulation, XPG incision activity is suppressed during coreTFIIH translocation on DNA but is licensed when coreTFIIH stalls at the lesion or when ATP hydrolysis is blocked. Moreover, ≥15 nucleotides of 5'-ssDNA is a prerequisite for efficient translocation and incision. Our results unveil a paired coordination mechanism in which key lesion scanning and DNA incision steps are sequentially coordinated, and damaged patch removal is only licensed after generation of ≥15 nucleotides of 5'-ssDNA, ensuring the correct ssDNA bubble size before cleavage.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2283385
- Journal Information:
- Nucleic Acids Research, Journal Name: Nucleic Acids Research Journal Issue: 3 Vol. 51; ISSN 0305-1048
- Publisher:
- Oxford University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molecular architecture and functional dynamics of the pre-incision complex in nucleotide excision repair
Dynamic conformational switching underlies TFIIH function in transcription and DNA repair and impacts genetic diseases
Molecular basis for damage recognition and verification by XPC-RAD23B and TFIIH in nucleotide excision repair
Journal Article
·
Tue Oct 01 00:00:00 EDT 2024
· Nature Communications
·
OSTI ID:2479734
Dynamic conformational switching underlies TFIIH function in transcription and DNA repair and impacts genetic diseases
Journal Article
·
Sat May 13 00:00:00 EDT 2023
· Nature Communications
·
OSTI ID:2229304
Molecular basis for damage recognition and verification by XPC-RAD23B and TFIIH in nucleotide excision repair
Journal Article
·
Thu Aug 23 00:00:00 EDT 2018
· DNA Repair
·
OSTI ID:1543540