Cited by 679Ubiquitin and proteasome pathwaysCancer-related Molecular PathwaysTGF-β signaling in diseases

A dynamic role of HAUSP in the p53-Mdm2 pathway

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Li, Muyang, Brooks, Christopher L, Kon, Ning, Gu, Wei·2004·Molecular Cell

Abstract

Our previous study showed that ubiquitination of p53 is reversible and that the ubiquitin hydrolase HAUSP can stabilize p53 by deubiquitination. Here, we found that partial reduction of endogenous HAUSP levels by RNAi indeed destabilizes endogenous p53; surprisingly, however, nearly complete ablation of HAUSP stabilizes and activates p53. We further show that this phenomenon occurs because HAUSP stabilizes Mdm2 in a p53-independent manner, providing an interesting feedback loop in p53 regulation. Notably, HAUSP is required for Mdm2 stability in normal cells; in HAUSP-ablated cells, self-ubiquitinated-Mdm2 becomes extremely unstable, leading to indirect p53 activation. Furthermore, this feedback regulation is specific to Mdm2; in HeLa cells, where p53 is preferentially degraded by viral E6-dependent ubiquitination, depletion of HAUSP fails to activate p53. This study provides an example of an ubiquitin ligase (Mdm2) that is directly regulated by a deubiquitinase (HAUSP) and also reveals a dynamic role of HAUSP in the p53-Mdm2 pathway.

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Crossref · 10.1016/s1097-2765(04)00157-1

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  • HAUSP is a deubiquitylase that binds to and stabilizes Mdm2 and Mdmx preferentially under normal growth conditions.

    “For example, HAUSP is a deubiquitylase (DUB) that binds to and stabilizes Mdm2 and Mdmx preferentially under normal growth conditions [45,46].”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [45]

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Authors
Li, M., Brooks, C. L., Kon, N., & Gu, W.
Affiliations
Columbia University (US)
Corresponding author
Gu, Wei
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2004-03
Volume
13
Issue
6
Pages
879-886
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2065886319
Cited by
679
References
35
Citations by year
2026: 21 · 2025: 25 · 2024: 23 · 2023: 31 · 2022: 26 · 2021: 31 · 2020: 46 · 2019: 33 · 2018: 22 · 2017: 31 · 2016: 34 · 2015: 28 · 2014: 41 · 2013: 29 · 2012: 29
FWCI
11.51
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
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 › TGF-β signaling in diseases
Keywords
USP7, p53, MDM2, p53-Mdm2 feedback loop, deubiquitination, protein stability, p53 activation, HeLa cells
MeSH terms
Ubiquitin-Specific Peptidase 7, Bone Neoplasms, Drug Stability, HeLa Cells, Humans, Nuclear Proteins, Endopeptidases, Proto-Oncogene Proteins, Substrate Specificity, Signal Transduction, Tumor Suppressor Protein p53, RNA, Small Interfering, MicroRNAs, Ubiquitin Thiolesterase, Cell Line, Tumor, Proto-Oncogene Proteins c-mdm2

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