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. 1992 Jan;66(1):115–121. doi: 10.1128/jvi.66.1.115-121.1992

Biological and biochemical activity of v-Crk chimeras containing the SH2/SH3 regions of phosphatidylinositol-specific phospholipase C-gamma and Src.

M Matsuda 1, C T Reichman 1, H Hanafusa 1
PMCID: PMC238266  PMID: 1370084

Abstract

The chicken CT10 virus oncogene product, P47gag-crk, contains SH2/SH3 domains that have been identified as conserved domains among proteins involved in signal transduction. We studied the functional similarity of the SH2/SH3 domains by replacing those of v-Crk with those of phosphatidylinositol-specific phospholipase C-gamma, v-Src, or c-Src. The transforming activity of v-Crk was partially retained in a mutant with a v-Src SH3 domain but not in the other mutants with heterologous SH2/SH3 domains. Mutant viruses with Crk-SH2/SH2' domains induced tyrosine phosphorylation of cellular proteins, but mutants with phosphatidylinositol-specific phospholipase C-gamma or Src SH2/SH2' domains did not. However, the mutant proteins with heterologous SH2/SH2' regions were able to weakly associate with some phosphotyrosine-containing proteins in vitro. These results indicate that in the context of the P47gag-crk structure, the requirement of Crk-SH2/SH3 is more stringent for its activity to induce cell transformation than to cause phosphorylation of cellular proteins. The substitution with heterologous sequences least perturbs the capacity to bind phosphotyrosine-containing proteins. In each case, the SH3 domain is more flexible to substitution than is the SH2 domain.

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