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Deletions in the SH2 domain of p60v-src prevent association with the detergent-insoluble cellular matrix.

Rockefeller University, New York, New York 10021.

ABSTRACT

p60v-src has been shown to associate with a detergent-insoluble cellular matrix containing cytoskeletal proteins, but p60c-src does not bind to this matrix. We analyzed the association of mutant src proteins with the matrix and found that mutants which lack an amino-terminal portion (residues 149 to 169) of the SH2 domain cannot bind to the matrix. Neither the SH3 region nor other portions of the SH2 region were required for association. We also tested protein kinase-defective mutants and chimeras of p60v-src and p60c-src. We found a strong correlation between the kinase activity of p60src and its association with the detergent-insoluble matrix. Double infection of kinase-defective and kinase-active mutants did not result in matrix binding of the kinase-defective src proteins. We also found that Tyr-416, the major site of autophosphorylation in p60v-src, was not required for matrix association.

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