A dynamic role of HAUSP in the p53-Mdm2 pathway
Open accessAbstract
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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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
- bronze
- doi.org
- Licence
- 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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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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