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We have constructed a series of mutants with deletion, linker insertion, and point mutations in the v-crk oncogene of avian sarcoma virus CT10. The v-crk gene contains no apparent catalytic domain, but does contain two blocks of homology to putative regulatory domains, termed SH2 and SH3, found in a variety of proteins implicated in signal transduction. Infection with CT10 causes a dramatic increase in the level of tyrosine phosphorylation of several cellular proteins. We found that mutation of either the SH2 or SH3 domain of v-crk reduced or eliminated transforming activity, whereas mutation of regions outside the conserved domains had no effect. Deletion of amino-terminal gag sequences caused a partial loss of transforming activity and a change in subcellular distribution of the crk protein. In all cases, there was an absolute correlation between increased cellular phosphotyrosine and transformation.

journal of virology

Mutagenic analysis of the v-crk oncogene: requirement for SH2 and SH3 domains and correlation between increased cellular phosphotyrosine and transformation