Cited by 83Ubiquitin and proteasome pathwaysCancer-related Molecular PathwaysCell death mechanisms and regulation

Deubiquitination of Tip60 by USP7 determines the activity of the p53-dependent apoptotic pathway.

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Dar, Ashraf, Shibata, Etsuko, Dutta, Anindya·2013·Molecular and Cellular Biology

Abstract

Tip60 is an essential acetyltransferase required for acetylation of nucleosomal histones and other nonhistone proteins. Tip60 acetylates the p53 tumor suppressor at lysine 120 (K120), a modification essential for p53-dependent induction of PUMA and apoptosis. It is known that Tip60 is turned over in cells by the ubiquitin-proteasome system. However, the deubiquitinase activity for stabilizing Tip60 is unknown. Here we show that USP7 interacts with and deubiquitinates Tip60 both in vitro and in vivo. USP7 deubiquitinase activity is required for the stabilization of Tip60 in order to operate an effective p53-dependent apoptotic pathway in response to genotoxic stress. Inhibiting USP7 with the small-molecule inhibitor P22077 attenuates the p53-dependent apoptotic pathway by destabilizing Tip60. P22077, however, is still cytotoxic, and this is partly due to destabilization of Tip60.

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  • USP7 contributes to p53-dependent apoptosis by interacting with and deubiquitinating Kat5, and promotes p53 K120 acetylation, PUMA expression, and apoptosis following DNA damage.

    “In addition to stabilizing p53 protein levels, USP7 contributes to p53-dependent apoptosis through interacting with and de-ubiquitinating Kat5. Further, USP7 was found to promote p53 K120 acetylation, as well as PUMA expression and apoptosis following DNA damage (Dar et al., 2013).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Dar et al., 2013

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Authors
Dar, A., Shibata, E., & Dutta, A.
Affiliations
University of Virginia (US)
Venue
Molecular and Cellular Biology
Published
2013-08-01
Volume
33
Issue
16
Pages
3309-3320
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2112280809
Cited by
83
References
50
Citations by year
2026: 1 · 2025: 6 · 2024: 3 · 2023: 2 · 2022: 4 · 2021: 5 · 2020: 11 · 2019: 7 · 2018: 9 · 2017: 7 · 2016: 7 · 2015: 8 · 2014: 10 · 2013: 2 · 2012: 1
FWCI
4.03
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (R01 CA60499, R01CA060499, P30CA044579)
  • National Institute of General Medical Sciences (GM84465, R01GM084465)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
Tip60, USP7, deubiquitination, p53 acetylation, p53-dependent apoptosis, PUMA, protein stability, histone acetylation, genotoxic stress, ubiquitin-proteasome system
MeSH terms
Lysine Acetyltransferase 5, Ubiquitin-Specific Peptidase 7, Cell Line, Humans, Proto-Oncogene Proteins, Thiophenes, Tumor Suppressor Protein p53, Apoptosis, Ubiquitin Thiolesterase, Cell Line, Tumor, Apoptosis Regulatory Proteins, Histone Acetyltransferases, Ubiquitination, Proteolysis

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