c-Abl Phosphorylates Hdmx and Regulates Its Interaction with p53
| Autor: | Grzegorz M. Popowicz, Aart G. Jochemsen, Tamar Grossman, Jean-Christophe Marine, Isabelle Silberman, Kristiaan Lenos, Ygal Haupt, Valentina Zuckerman, Tad A. Holak |
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| Rok vydání: | 2009 |
| Předmět: |
MDMX
DNA damage Cell Cycle Proteins Biology Peptide Mapping Biochemistry Ubiquitin Catalytic Domain Cell Line Tumor Proto-Oncogene Proteins Humans Phosphorylation Proto-Oncogene Proteins c-abl Molecular Biology ABL Nuclear Proteins Proto-Oncogene Proteins c-mdm2 Cell Biology Protein Structure Tertiary Cell biology biology.protein Cancer research Mdm2 Tumor Suppressor Protein p53 Protein Processing Post-Translational Tyrosine kinase DNA Damage P53 binding |
| Zdroj: | Journal of Biological Chemistry. 284:4031-4039 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m809211200 |
| Popis: | Upon exposure to DNA damage the p53 tumor suppressor is accumulated and activated to stall cellular growth. For this to occur, p53 must be relieved from its major inhibitors, Mdm2 (Hdm2 in humans) and Mdmx (Mdm4; Hdmx in humans). A key mechanism controlling this relief is the post-translational modifications of p53 and its inhibitors. We have previously demonstrated that the stress-activated tyrosine kinase, c-Abl, contributes to the relief of p53 from Hdm2. Because Hdmx is the major inhibitor of p53 activity, the additional possibility that c-Abl protects p53 through targeting Hdmx was explored in this study. c-Abl was found to interact with and to phosphorylate Hdmx. This phosphorylation was enhanced in response to DNA damage. Importantly, we mapped the sites of phosphorylation to the p53 binding domain of Hdmx. One of these phosphorylations, on tyrosine 99, inhibited Hdmx interaction with p53. This inhibition is consistent with the predicted role of this residue in the interaction with p53 based on the crystal structure of the interaction site. Our results show that c-Abl not only targets Hdm2, but also Hdmx, which together contribute to p53 activation in response to DNA damage. |
| Databáze: | OpenAIRE |
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