Phosphorylation of the acidic domain of Mdm2 by protein kinase CK2

Nerea Allende-Vega, Sylvia Dias, Diane Milne, David Meek

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    The Murine double-minute clone 2 (Mdm2) onco-protein is the principal regulator of the tumour suppressor, p53. Mdm2 acts as an E3-type ubiquitin ligase that mediates the ubiquitylation and turnover of p53 under normal, unstressed circumstances. In response to cellular stress, such as DNA damage, the Mdm2-p53 interaction is disrupted. Part of the mechanism of uncoupling p53 from Mdm2-mediated degradation involves hypo-phosphorylation of a cluster of phosphorylated serine residues in the central acidic domain of Mdm2. Here, we show that two of the residues within this domain that are phosphorylated in vivo, Ser-260 and Ser-269, are phosphorylated by CK2 in vitro. Treatment of cells with the CK2 inhibitor, 4,5,6,7-tetrabromo-2-azabenzimidazole (TBB), leads to the induction of p53 and downstream targets of p53 including Mdm2 itself and p21. These data are consistent with the idea that CK2-mediated phosphorylation of Mdm2 may regulate Mdm2-mediated p53 turnover.
    Original languageEnglish
    Pages (from-to)85-90
    Number of pages6
    JournalMolecular and Cellular Biochemistry
    Volume274
    Issue number1-2
    DOIs
    Publication statusPublished - Jun 2005

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