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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Rous sarcoma virus transforming protein lacking myristic acid phosphorylates known polypeptide substrates without inducing transformation.

Mutagenesis of glycine 2 of p60src, the transforming protein of Rous sarcoma virus (RSV), yields a protein that is neither myristylated nor bound to cellular membranes. Although these mutant viruses retain full tyrosine protein kinase activity, they are transformation-defective. We examined in detail tyrosine phosphorylation of cellular polypeptides and the phenotype induced by infection with two such viruses. Infection failed to cause growth in agar, cytoskeletal reorganization, or changes in fibronectin synthesis and protease secretion. Strikingly, tyrosine phosphorylation of the known substrates of p60src was extensive, and differed from that found in wild-type transformed cells only quantitatively. There was no apparent correlation between the extent to which any of eight known protein substrates of p60src were phosphorylated and the phenotype of infected cells. We suggest that the phosphorylation of as yet unidentified proteins, which are probably found in cellular membranes, is essential for transformation by RSV.[1]


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