The conformational change of a murine temperature-sensitive p53 protein is independent of a change in phosphorylation status

S. M. Picksley, D. W. Meek, D. P. Lane

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Wild-type and mutant p53 proteins exhibit opposing activities in respectively suppressing and promoting tumour development. In a rat embryo fibroblast cell line transformed with a murine temperature-sensitive p53 gene, p53 functions as a oncogene at 37 degrees C and as a tumour suppressor at 32 degrees C [Michalovitz, D., Halevy, O. & Oren, M. (1990). Cell, 62, 671-680]. We have used this cell line to investigate whether this temperature-dependent switching of function involves changes in the phosphorylation of p53 protein. Monoclonal antibodies PAb246 and PAb240 were used to immunoprecipitate metabolically 32P-labelled p53 protein in the 'wild-type' or mutant conformation from cells grown at 32 degrees C or 37 degrees C. Tryptic phosphopeptide maps were prepared from the isolated 'wild-type' and mutant p53 proteins. At 32 degrees C and 37 degrees C phosphopeptide maps of the 'wild-type' and mutant protein were identical. This demonstrates that the temperature-dependent conformation change, and associated functional change, in the p53 protein does not involve a change in the state of phosphorylation.
    Original languageEnglish
    Pages (from-to)1649-1651
    Number of pages3
    JournalOncogene
    Volume7
    Issue number8
    Publication statusPublished - Aug 1992

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