Abstract
p53 and MDM2 are both degraded by the ubiquitin-proteasome pathway. MDM2 binds p53 and promotes its rapid degradation. MDM2 is an E3 ligase that activates self and p53 ubiquitylation. Moreover, MDM2 nuclear-cytoplasmic shuttling contributes to p53 degradation in the cytoplasm. We have identified a new region of MDM2 which regulates the stability of both p53 and MDM2. The first 50 amino-acids of the MDM2 acidic domain (222–272) contribute to MDM2 and MDM2-mediated p53 degradation by a mechanism which is independent of either MDM2 E3-ligase activity or MDM2 nucleo-cytoplasmic shuttling. The transcriptional coactivator p300 could have been involved, since it binds to the MDM2 acidic domain. However, we found that p300 stabilises MDM2, even in absence of an intact acidic domain, indicating that the MDM2 acidic region contributes to proteolysis independently of p300. We propose that the MDM2 acidic domain is required for unbiquitylated MDM2 and p53 to be degraded by cytoplasmic proteasomes.
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Acknowledgements
We thank: (1) for the gift of recombinants and antibodies, D Bohmann, T Leveillard and Y Lutz; (2) for invaluable help, the IGBMC facilities staff; (3) for fellowships for M Argentini, the Ligue Régional (Bas-Rhin) contre le Cancer, the Association pour la Recherche sur le Cancer and Ministére de la Recherche et de Technologie; (4) for a fellowship for N Barboule, Rhone-Poulenc; (5) for financial assistance, BioAvenir (Rhone-Poulenc), the Centre National de la Recherche Scientifique, the Institut National de la Santé et de la Recherche Médicale, the Hôpital Universitaire de Strasbourg, the Association pour la Recherche sur le Cancer, the Fondation pour la Recherche Mèdicale, the Ligue Nationale Française contre le Cancer, the Ligue Régionale (Haut-Rhin) contre le Cancer and the Ligue Régionale (Bas-Rhin) contre le Cancer.
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Argentini, M., Barboule, N. & Wasylyk, B. The contribution of the acidic domain of MDM2 to p53 and MDM2 stability. Oncogene 20, 1267–1275 (2001). https://doi.org/10.1038/sj.onc.1204241
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DOI: https://doi.org/10.1038/sj.onc.1204241
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