MDM2 Promotes Proteasome-Dependent Ubiquitin-Independent Degradation of Retinoblastoma Protein
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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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MDM2 encodes a nuclear-localized E3 ubiquitin ligase that mediates the degradation of p53 and RB1 in a proteasome-dependent and ubiquitin-independent manner.
“MDM2 encodes a nuclear-localized E3 ubiquitin ligase that mediates the degradation of p53 and RB162 in a proteasome-dependent and ubiquitin-independent manner64.”
From Distinct selective forces and Neanderthal introgression shaped genetic diversity at genes involved in neurodevelopmental disorders (2017) · cites this paper as [64]
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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
- bronze
- doi.org
- Licence
- 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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