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. 1990 Feb;64(2):672–679. doi: 10.1128/jvi.64.2.672-679.1990

Simian virus 40 large T antigen induces or activates a protein kinase which phosphorylates the transformation-associated protein p53.

K H Scheidtmann 1, A Haber 1
PMCID: PMC249159  PMID: 2153233

Abstract

The cellular phosphoprotein p53 is presumably involved in simian virus 40 (SV40)-induced transformation. We have monitored changes in the state of phosphorylation of p53 from normal versus SV40-infected or -transformed cells. In normal cells, p 53 was hardly phosphorylated. Upon infection or transformation, a quantitative and qualitative increase in p53 phosphorylation was observed as revealed by two-dimensional phosphopeptide analysis. This increase was dependent on a functional large T antigen. In rat cells, enhanced phosphorylation of p53 resulted in conversion to a second, electrophoretically distinct form. In cells transformed with transformation-defective mutants, phosphorylation of p53 was reduced and conversion to form 2 was inefficient. These data suggest (i) that SV40 large T antigen induces or activates a protein kinase, one substrate of which is p53, (ii) that transformation-defective mutants are impaired in kinase induction, and (iii) that either a certain phosphorylation state of p53 or the SV40-induced kinase is critical for efficient transformation.

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