Cited by 296Cancer-related Molecular PathwaysUbiquitin and proteasome pathwaysHeat shock proteins research

MDM2 Promotes Proteasome-Dependent Ubiquitin-Independent Degradation of Retinoblastoma Protein

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Sdek, Patima, Ying, Haoqiang, Chang, Donny L.F., Qiu, Wei, Zheng, Hongwu, Touitou, Robert, Allday, Martin J., Jim Xiao, Zhi-Xiong·2005·Molecular Cell

Abstract

Inactivation of retinoblastoma protein (Rb) plays a critical role in the development of human malignancies. It has been shown that Rb is degraded through a proteasome-dependent pathway, yet the mechanism is largely unclear. MDM2 is frequently found amplified and overexpressed in a variety of human tumors. In this study, we find that MDM2 promotes Rb degradation in a proteasome-dependent and ubiquitin-independent manner. We show that Rb, MDM2, and the C8 subunit of the 20S proteasome interact in vitro and in vivo and that MDM2 promotes Rb-C8 interaction. Expression of wild-type MDM2, but not the mutant MDM2 defective either in Rb interaction or in RING finger domain, promotes cell cycle S phase entry independent of p53. Furthermore, MDM2 ablation results in Rb accumulation and inhibition of DNA synthesis. Taken together, these findings demonstrate that MDM2 is a critical negative regulator for Rb and suggest that MDM2 overexpression contributes to cancer development by destabilizing Rb.

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Crossref · 10.1016/j.molcel.2005.10.017

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Authors
Sdek, P., Ying, H., Chang, D. L. F., Qiu, W., Zheng, H., Touitou, R., Allday, M. J., & Jim Xiao, Z.-X.
Affiliations
  • Boston University (US)
  • Ludwig Cancer Research (GB)
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2005-12
Volume
20
Issue
5
Pages
699-708
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2064676609
Cited by
288
References
52
Citations by year
2026: 6 · 2025: 6 · 2024: 9 · 2023: 32 · 2022: 10 · 2021: 15 · 2020: 8 · 2019: 4 · 2018: 15 · 2017: 14 · 2016: 13 · 2015: 14 · 2014: 14 · 2013: 11 · 2012: 15
FWCI
7.62
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
Funders
  • National Institutes of Health
  • Centers for Disease Control and Prevention (NIH/NCI79804)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
Keywords
MDM2, retinoblastoma protein, proteasomal degradation, ubiquitin-independent degradation, protein-protein interaction, RING domain, protein stability, carcinogenesis
MeSH terms
Cysteine Endopeptidases, DNA, Gamma Rays, Humans, Retinoblastoma Protein, S Phase, Ubiquitin, Cell Line, Tumor, Proteasome Endopeptidase Complex, Proto-Oncogene Proteins c-mdm2, In Vitro Techniques

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