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- W1639883374 abstract "A number of oncogenic viruses encode transforming proteins with protein kinase activities apparently specific for tyrosine residues. Recent evidence has raised questions as to the substrate specificity of these kinases in general and the physiological relevance of tyrosine phosphorylation in particular. The P130gag-fps transforming protein of Fujinami sarcoma virus (FSV) is strongly phosphorylated at 2 tyrosine residues in FSV-transformed cells of which 1 (Tyr-1073) is also the major site of P130gag-fps intermolecular autophosphorylation in vitro. We have investigated the specificity of the protein kinase activity intrinsic to FSV P130gag-fps by using site-directed mutagenesis to change the codon for Tyr-1073 to those for the other commonly phosphorylated hydroxyamino acids, serine and threonine. This approach has some advantages over the use of synthetic peptides to define protein kinase recognition sites in that the protein containing the altered target site can be expressed in intact cells. In addition it allows higher order as well as primary structure of the enzyme recognition site to be considered. Neither serine nor threonine were phosphorylated when substituted for tyrosine at position 1073 of P130gag-fps indicating a stringent specificity for tyrosine as a substrate of the P130gag-fps protein kinase autophosphorylating activity. Consistent with the suggestion that tyrosine phosphorylation is of functional significance we find that these and other FSV Tyr-1073 mutants have depressed enzymatic and oncogenic capacities." @default.
- W1639883374 created "2016-06-24" @default.
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- W1639883374 date "1986-01-01" @default.
- W1639883374 modified "2023-09-27" @default.
- W1639883374 title "Protein kinase activity of FSV (Fujinami sarcoma virus) P130gag-fps shows a strict specificity for tyrosine residues." @default.
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- W1639883374 doi "https://doi.org/10.1016/s0021-9258(17)42474-4" @default.
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