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Mol Cell Biol. 1981 February; 1(2): 165-178

Changes in protein phosphorylation in Rous sarcoma virus-transformed chicken embryo cells.

Salk Institute, San Diego, California 92138.

ABSTRACT

Rous sarcoma virus encodes a tyrosine-specific protein kinase (p60src) which is necessary for cell transformation. To identify substrates for this kinase, we set out to detect phosphotyrosine-containing proteins in Rous sarcoma virus-transformed chicken embryo cells, making use of the known alkali stability of phosphotyrosine. 32P-labeled phosphoproteins were separated by isoelectric focusing and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The gels were then incubated in alkali. Using this procedure with normal cells, we detected a total of about 190 alkali-resistant phosphoproteins. In Rous sarcoma virus-transformed cells, five phosphoproteins were found which were not detectable in normal cells. Two of these are probably structural proteins of the virus. The other three transformation-dependent phosphoproteins, and four other phosphoproteins which were elevated by transformation, all contained phosphotyrosine. Increased phosphorylation of these proteins did not occur with cells infected with a mutant Rous sarcoma virus, temperature sensitive for transformation, grown at the restrictive temperature. We conclude that these seven proteins are probably substrates of p60src, although they may be substrates for other tyrosine-specific protein kinases activated by p60src.

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