Small molecules that bind the Mdm2 RING stabilize and activate p53
Abstract
p53 is a tumor suppressor that responds to a variety of stresses such as oncogenes and DNA damage by activating its transcriptional targets to allow repair or elimination of damaged cells. In the absence of stress signals, p53 needs to be kept in check and this is achieved by the E3 ligase MDM2. For tumors that retain wild-type p53, therapeutic strategies aimed at removing the inhibitory activity of MDM2 on p53 are under development and to date have focused on drugs that prevent the binding of p53 to MDM2. Here, we report the analysis of a group of synthetic analogs derived from 5-deazaflavin compounds previously identified in a screen as inhibitors of MDM2 autoubiquitination. Using measurement of surface plasmon resonance, we demonstrated that active 5-deazaflavin analogs bind to the MDM2 RING, whereas inactive compounds show no binding. In cellular assays, these active MDM2 RING binding compounds inhibited the ubiquitination of p53, stabilized p53, led to increased expression of p53 targets and caused corresponding cell cycle effects. Deazaflavin analogs therefore function to activate p53 through a novel mechanism, by inhibiting the E3 ligase activity of MDM2 in a manner that involves binding to the MDM2 RING.
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Several compounds that block MDM2's ubiquitin ligase function were found in high-throughput screens, such as HLI98, MPD derivatives, MEL23 and MEL24.
“Small molecules that inhibit MDM2 ubiquitin ligase activity have been identified in high-throughput screens. These include HLI98 (Ref. 115), the derivative MPD compounds116, MEL23 and MEL24 (Ref. 117).”
From MDM2, MDMX and p53 in oncogenesis and cancer therapy (2013) · cites this paper as [116]
MPD37, the most potent of these compounds, was reported to bind the RING domain of MDM2.
“MPD37 (the most potent among such compounds) was shown to bind the MDM2 RING domain”
From MDM2, MDMX and p53 in oncogenesis and cancer therapy (2013) · cites this paper as [116]
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BindingDB (2014) · UC San Diego · doi:10.7270/q2ks6t01
- Authors
- Roxburgh, P., Hock, A. K., Dickens, M. P., Mezna, M., Fischer, P. M., & Vousden, K. H.
- Affiliations
- Cancer Research UK Scotland Institute (GB)
- University of Nottingham (GB)
- Corresponding author
- Vousden, K. H.
- Venue
- Carcinogenesis
- Publisher
- Oxford University Press (OUP)
- Published
- 2012-02-02
- Volume
- 33
- Issue
- 4
- Pages
- 791-798
- ISSN
- 0143-3334 (ISSN-L)
- 1460-2180
- OpenAlex
- W2171947267
- Cited by
- 43
- References
- 51
- Citations by year
- 2025: 2 · 2021: 3 · 2020: 2 · 2019: 4 · 2018: 3 · 2017: 7 · 2016: 6 · 2015: 1 · 2014: 10 · 2013: 5
- FWCI
- 2.69
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Carcinogenesis (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Cancer Research UK
- Beatson Institute for Cancer Research
- 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
- p53 activation, MDM2, small molecule inhibitors, p53 ubiquitination, p53 stabilization, tumor suppressor, cell cycle arrest
- MeSH terms
- Flavins, Flow Cytometry, Humans, Protein Binding, Tumor Suppressor Protein p53, Surface Plasmon Resonance, Proto-Oncogene Proteins c-mdm2, Ubiquitination
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