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Updated: Sep 4, 2025

Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples
Published on: May 10, 2015
Insights Into the Properties, Biological Functions, and Regulation of USP21
Tao An1, Yanting Lu2, Xu Yan1
1School of Pharmaceutical Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China.
Abstract:
Deubiquitylating enzymes (DUBs) antagonize ubiquitination by removing ubiquitin from their substrates. The role of DUBs in controlling various physiological and pathological processes has been extensively studied, and some members of DUBs have been identified as potential therapeutic targets in diseases ranging from tumors to neurodegeneration. Ubiquitin-specific protease 21 (USP21) is a member of the ubiquitin-specific protease family, the largest subfamily of DUBs. Although USP21 was discovered late and early research progress was slow, numerous studies in the last decade have gradually revealed the importance of USP21 in a wide variety of biological processes. In particular, the pro-carcinogenic effect of USP21 has been well elucidated in the last 2 years. In the present review, we provide a comprehensive overview of the current knowledge on USP21, including its properties, biological functions, pathophysiological roles, and cellular regulation. Limited pharmacological interventions for USP21 have also been introduced, highlighting the importance of developing novel and specific inhibitors targeting USP21.
Insights
Ubiquitin-specific protease 21 (USP21) removes ubiquitin and plays a key role in various biological processes. Recent studies highlight USP21's pro-carcinogenic effects, emphasizing its potential as a therapeutic target.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Deubiquitylating enzymes (DUBs) regulate protein function by removing ubiquitin.
- USP21, a prominent DUB, has emerged as crucial in diverse biological functions.
- Growing evidence links USP21 to pro-carcinogenic activities.
Purpose of the Study:
- To provide a comprehensive review of Ubiquitin-specific protease 21 (USP21).
- To summarize current knowledge on USP21's properties, functions, and regulation.
- To discuss USP21's pathophysiological roles, particularly in cancer.
Main Methods:
- Literature review of studies on USP21.
- Analysis of USP21's involvement in physiological and pathological processes.
- Examination of cellular regulation mechanisms of USP21.
Main Results:
- USP21 is implicated in a wide array of biological processes.
- USP21 exhibits significant pro-carcinogenic effects, elucidated in recent years.
- Current pharmacological interventions targeting USP21 are limited.
Conclusions:
- USP21 is a critical regulator with diverse biological functions.
- USP21's role in cancer progression necessitates further investigation.
- Development of specific USP21 inhibitors is crucial for therapeutic applications.
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