REGγ, a proteasome activator and beyond?

  • I. Mao
  • J. Liu
  • X. LiEmail author
  • H. LuoEmail author


REGγ, a member of the 11S proteasome activators, has been shown to bind and activate the 20S proteasome to promote proteasome-dependent degradation of important regulatory proteins, such as SRC-3 and cyclin-dependent kinase inhibitors p21, p16, and p19, in a ubiquitin- and ATP-independent manner. Furthermore, REGγ has been shown to facilitate the turnover of tumor suppressor p53 by promoting MDM2-mediated p53 ubiquitination. The discovery that REGγ regulates cell-cycle regulators is consistent with previous studies where REGγ-deficient mice have shown retardation in body growth, decreased cell proliferation and increased apoptosis, indicating a potential role of REGγ in cancer development. Additionally, REGγ’s ability to promote viral protein degradation suggests its involvement in viral pathogenesis. This review presents an overview of the function of REGγ, a summary of the current literature, and insight into the possible biological function of REGγ relating to cancer, viral pathogenesis, and other diseases.


Proteasome activator REGγ ubiquitin- and ATP-independent protein degradation cancer viral pathogenesis SRC-3 p21 p53 

Copyright information

© Birkhäuser Verlag, Basel 2008

Authors and Affiliations

  1. 1.The Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghaiChina
  2. 2.The James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Research, Department of Pathology and Laboratory MedicineUniversity of British Columbia, Providence Heart + Lung Institute, St. Paul’s HospitalVancouverCanada

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