The elevated level of CCNB1 indicates more aggressive cancer and poor prognosis. However, the factors that cause CCNB1 upregulation remain enigmatic. Herein, we identify USP22 as a CCNB1 interactor and discover that both USP22 and CCNB1 are dramatically elevated with a strong positive correlation in colon cancer tissues. USP22 stabilizes CCNB1 by antagonizing proteasome-mediated degradation in a cell cycle-specific manner. Phosphorylation of USP22 by CDK1 enhances its activity in deubiquitinating CCNB1. The ubiquitin ligase anaphase-promoting complex (APC/C) targets USP22 for degradation by using the substrate adapter CDC20 during cell exit from M phase, presumably allowing CCNB1 degradation. Finally, we discover that USP22 knockdown leads to slower cell growth and reduced tumor size. Our study demonstrates that USP22 is a CCNB1 deubiquitinase, suggesting that targeting USP22 might be an effective approach to treat cancers with elevated CCNB1 expression.
Ubiquitin-specific protease 22 is a deubiquitinase of CCNB1
Zhenghong Lin,Can Tan,Q. Qiu,Sinyi Kong,Heeyoung Yang,Fang Zhao,Zhaojian Liu,Jinping Li,Qingfei Kong,Beixue Gao,Terry Barrett,Guang-Yu Yang,Jianing Zhang,Deyu Fang
Published 2015 in Cell Discovery
ABSTRACT
PUBLICATION RECORD
- Publication year
2015
- Venue
Cell Discovery
- Publication date
2015-10-13
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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