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  • Title: Epidermal growth factor stimulates serine and tyrosine phosphorylation in a 59-kD protein in purified plasma membranes from rat liver.
    Author: David-Pfeuty T, Guesdon F.
    Journal: Biochem Biophys Res Commun; 1987 Jun 15; 145(2):982-8. PubMed ID: 2439087.
    Abstract:
    Preincubation of purified plasma membranes from rat liver with EGF stimulates the level of phosphorylation on serine and tyrosine residues in a 59-kD protein. Such an increased phosphoserine and phosphotyrosine content of the 59-kD protein occurs at the expense of the phosphorylation on threonine residues. The effect is observed under conditions where the plasma membranes have been extracted at pH 10. It is not observed when the membranes are simply washed at pH 7.5 before further purification. A number of experiments, including TBR-IgG phosphorylation in immunoprecipitates and partial hydrolysis with varying concentrations of the V8 protease, suggest that the 59-kD protein modified upon EGF treatment could be a representative of the c-src gene product from hepatocytes.
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