The catalytic activity of Src is dispensable for translocation to focal adhesions but controls the turnover of these structures during cell motility

The EMBO Journal
Valerie J Fincham, M C Frame

Abstract

The Src family of protein tyrosine kinases is involved in transducing signals at sites of cellular adhesion. In particular, the v-Src oncoprotein resides in cellular focal adhesions, where it induces tyrosine phosphorylation of pp125FAK and focal adhesion loss during transformation. v-Src is translocated to cellular focal adhesions by an actin-dependent process. Here we have used mutant v-Src proteins that are temperature-dependent for translocation, but with secondary mutations that render them constitutively kinase-inactive or myristylation-defective, to show that neither v-Src kinase activity nor a myristyl group are required to induce association of v-Src with actin stress fibres and redistribution to sites of focal adhesions at the stress fibre termini. Moreover, switching the constitutively kinase-inactive or myristylation-defective temperature-sensitive v-Src proteins to the permissive temperature resulted in concomitant association with tyrosine-phosphorylated focal adhesion kinase (pp125FAK) and redistribution of both to focal adhesions. However, both catalytic activity and myristylation-mediated membrane association are required to induce dissociation of pp125FAK from v-Src, later degradation of pp125FAK and focal adh...Continue Reading

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