Cited by 124DNA Repair MechanismsUbiquitin and proteasome pathwaysNuclear Structure and Function

Regulation of nucleotide excision repair activity by transcriptional and post-transcriptional control of the XPA protein

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Kang, T.-H., Reardon, J. T., Sancar, A.·2011·Nucleic Acids Research

Abstract

The XPA (Xeroderma pigmentosum A) protein is one of the six core factors of the human nucleotide excision repair system. In this study we show that XPA is a rate-limiting factor in all human cell lines tested, including a normal human fibroblast cell line. The level of XPA is controlled at the transcriptional level by the molecular circadian clock and at the post-translational level by a HECT domain family E3 ubiquitin ligase called HERC2. Stabilization of XPA by downregulation of HERC2 moderately enhances excision repair activity. Conversely, downregulation of XPA by siRNA reduces excision repair activity in proportion to the level of XPA. Ubiquitination and proteolysis of XPA are inhibited by DNA damage that promotes tight association of the protein with chromatin and its dissociation from the HERC2 E3 ligase. Finally, in agreement with a recent report, we find that XPA is post-translationally modified by acetylation. However, contrary to the previous claim, we find that in mouse liver only a small fraction of XPA is acetylated and that downregulation of SIRT1 deacetylase in two human cell lines does not affect the overall repair rate. Collectively, the data reveal that XPA is a limiting factor in excision repair and that its level is coordinately regulated by the circadian clock, the ubiquitin-proteasome system and DNA damage.

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Crossref · 10.1093/nar/gkq1318

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  • The activity of NER and sensitization of cancer cells to chemotherapy can be regulated by transcriptional and post-transcriptional control of the XPA protein.

    “Because of XPA’s crucial functions in NER, the activity of NER and sensitization of cancer cells to chemotherapy can be regulated by transcriptional and post-transcriptional control of the XPA protein [19], [20], [21], [22], [23], [24], [25], [26].”
  • XPA may serve as a potential target for sensitization to cancer chemotherapy (e.g. cisplatin) via manipulation of available nuclear XPA, either at the transcriptional or post-transcriptional level.

    “XPA may serve as a potential target for sensitization to cancer chemotherapy (e.g. cisplatin) via manipulation of available nuclear XPA, either at the transcriptional or post-transcriptional level [53], [54], [55].”
  • XPA is part of the core NER incision complex and interacts with DNA and other NER and damage-response proteins.

    “Xeroderma pigmentosum complement group A (XPA), a gene frequently mutated in XP patients, is part of the core incision complex of NER and interacts with DNA as well as many other NER and damage response proteins”

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Authors
Kang, T.-H., Reardon, J. T., & Sancar, A.
Affiliations
University of North Carolina at Chapel Hill (US)
Corresponding author
Sancar, A.
Venue
Nucleic Acids Research
Published
2010-12-30
Volume
39
Issue
8
Pages
3176-3187
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2116594363
Cited by
124
References
45
Citations by year
2026: 4 · 2025: 4 · 2024: 5 · 2023: 2 · 2022: 4 · 2021: 15 · 2020: 6 · 2019: 5 · 2018: 9 · 2017: 13 · 2016: 11 · 2015: 11 · 2014: 12 · 2013: 7 · 2012: 11
FWCI
2.99
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM032833, R01GM031082, GM310.82, R37GM031082, GM32833)
  • National Institute of Environmental Health Sciences (P30ES010126)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
Keywords
XPA, nucleotide excision repair, xeroderma pigmentosum, HERC2, E3 ubiquitin ligase, ubiquitination, protein stability, circadian clock, SIRT1, protein acetylation, DNA damage response, chromatin association, transcriptional regulation, post-transcriptional regulation, mouse liver
MeSH terms
Acetylation, Animals, Cell Line, DNA Damage, DNA Repair, Fibroblasts, Humans, Transcription, Genetic, Ubiquitin-Protein Ligases, Mice, Xeroderma Pigmentosum Group A Protein, Ubiquitination, Circadian Clocks

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