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Abstract
The feline c-fes proto-oncogene, different parts of which were captured in feline leukemia virus (FeLV) to generate the transforming genes (v-fes) of the Gardner-Arnstein (GA) strain of feline sarcoma virus (FeSV) and the Snyder-Theilen strain (ST) of FeSV, was cloned and its genetic organization determined. Southern blot analysis revealed that the c-fes genetic sequences were distributed discontinuously and colinearly with the v-fes transforming gene over a DNA region of around 12.0 kb. Using cloned c-fes sequences, complementation of GA-FeSV transforming activity was studied. Upon replacement of the 3' half of v-fesGA with homologous feline c-fes sequences and transfection of the chimeric gene, morphological transformation was observed. Immunoprecipitation analysis of these transformed cells revealed expression of high Mr fusion proteins. Phosphorylation of these proteins was observed in an in vitro protein kinase assay, and tyrosine residues appeared to be involved as acceptor amino acid.
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