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The ubiquitin-specific protease USP28 is required for MYC stability
Nikita Popov1, Michael Wanzel, Mandy Madiredjo
1Institute of Molecular Biology and Tumor Research, Emil-Mannkopff-Str.2, 35033 Marburg, Germany.
Nature Cell Biology
|June 15, 2007
Summary
The ubiquitin-specific protease USP28 stabilizes the MYC oncoprotein, a key driver in many human tumors. This stabilization is crucial for tumor cell growth, highlighting USP28 as a potential therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- The MYC proto-oncogene is a critical transcription factor frequently dysregulated in human cancers.
- Understanding the regulatory mechanisms controlling MYC stability is essential for developing targeted cancer therapies.
Purpose of the Study:
- To identify genes essential for MYC function using a functional genomic screen.
- To elucidate the role of USP28 in MYC stabilization and its implications in cancer.
Main Methods:
- A bar-code short hairpin RNA (shRNA) screen was employed to identify genes required for MYC activity.
- Protein-protein interactions and cellular localization studies were performed to understand USP28-MYC regulation.
Main Results:
- USP28, an ubiquitin-specific protease, was identified as crucial for MYC stability in tumor cells.
- USP28 binds MYC via FBW7alpha, stabilizing MYC in the nucleus, while degradation occurs in the nucleolus via FBW7gamma.
- Elevated USP28 expression correlates with colon and breast carcinomas, and MYC stabilization by USP28 is vital for tumor proliferation.
Conclusions:
- USP28 plays a critical role in maintaining MYC stability and promoting tumor cell proliferation.
- USP28 represents a promising therapeutic target for MYC-driven cancers.
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