Cited by 66Ubiquitin and proteasome pathwaysDNA Repair MechanismsEpigenetics and DNA Methylation

USP7 modulates UV-induced PCNA monoubiquitination by regulating DNA polymerase eta stability.

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Qian, J, Pentz, K, Zhu, Q, Wang, Q, He, J, Srivastava, A K, Wani, A A·2015·Oncogene

Abstract

DNA polymerase eta (Polη) has unique and pivotal functions in several DNA damage-tolerance pathways. Steady-state level of this short-lived protein is tightly controlled by multiple mechanisms including proteolysis. Here, we have identified the deubiquitinating enzyme (DUB), ubiquitin-specific protease 7 (USP7), as a novel regulator of Polη stability. USP7 regulates Polη stability through both indirect and direct mechanisms. Knockout of USP7 increased the steady-state level of Polη and slowed down the turnover of both Polη and p53 proteins through destabilizing their E3 ligase murine double minute 2 (Mdm2). Also, USP7 physically binds Polη in vitro and in vivo. Overexpression of wild-type USP7 but not its catalytically-defective mutants deubiquitinates Polη and increases its cellular steady-state level. Thus, USP7 directly serves as a specific DUB for Polη. Furthermore, ectopic expression of USP7 promoted the UV-induced proliferating cell nuclear antigen (PCNA) monoubiquitination in Polη-proficient but not in Polη-deficient XPV (Xeroderma pigmentosum variant) cells, suggesting that USP7 facilitates UV-induced PCNA monoubiquitination by stabilizing Polη. Taken together, our findings reveal a modulatory role of USP7 in PCNA ubiquitination-mediated stress-tolerance pathways by fine-tuning Polη turnover.

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  • USP7 has been proposed to regulate the stability of the TLS polymerase DNA polymerase eta (Pol η).

    “USP7 has also been proposed to regulate the stability of the TLS polymerase, DNA polymerase eta (Pol η) (Qian et al., 2015).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Qian et al., 2015

  • Both depletion and over-expression of USP7 in cells were reported to enhance Pol η protein levels.

    “Indeed, as evidence of this complexity, both the depletion and over-expression of USP7 in cells were reported to enhance Pol η protein levels (Qian et al., 2015).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Qian et al., 2015

  • This defect seems due to a role of USP7 in regulating ubiquitination of the PCNA sliding clamp.

    “This defect seems due to a role of USP7 in regulating ubiquitination of the PCNA sliding clamp (Kashiwaba et al., 2015; Qian et al., 2015; Masuda et al., 2019).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Qian et al., 2015

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Authors
Qian, J., Pentz, K., Zhu, Q., Wang, Q., He, J., Srivastava, A. K., & Wani, A. A.
Affiliations
  • The Ohio State University (US)
  • The Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (US)
Corresponding author
  • Qian, J
  • Wani, A A
Venue
Oncogene
Published
2014-12-01
Volume
34
Issue
36
Pages
4791-4796
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W2044856539
Cited by
61
References
22
Citations by year
2026: 2 · 2025: 1 · 2024: 4 · 2023: 6 · 2022: 1 · 2021: 5 · 2020: 9 · 2019: 8 · 2018: 3 · 2017: 8 · 2016: 8 · 2015: 6
FWCI
3.00
Type
journal article
Language
en
Open access
Locations
  • Oncogene (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Environmental Health Sciences (ES012991, ES023883, R01ES002388, R01ES012991, R21ES023883)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
USP7, DNA polymerase eta, PCNA monoubiquitination, protein stability, deubiquitination, MDM2, p53, UV-induced DNA damage, DNA damage tolerance, xeroderma pigmentosum variant, protein turnover
MeSH terms
Ubiquitin-Specific Peptidase 7, Y-Family DNA Polymerases, Animals, DNA Damage, DNA-Directed DNA Polymerase, DNA Replication, Enzyme Stability, Humans, Ultraviolet Rays, Colorectal Neoplasms, Gene Expression Regulation, Neoplastic, Tumor Suppressor Protein p53, Proliferating Cell Nuclear Antigen, Ubiquitin Thiolesterase, HCT116 Cells, Mice, Proto-Oncogene Proteins c-mdm2, Ubiquitination, Gene Knockout Techniques

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