PMID: 7541382Jun 15, 1995Paper

c-Src enhances the spreading of src-/- fibroblasts on fibronectin by a kinase-independent mechanism

Genes & Development
K B KaplanH E Varmus

Abstract

We have explored the role of the tyrosine kinase c-Src in cellular adhesion. Fibroblasts derived from src-/- mice (src-/- fibroblasts) exhibit a reduced rate of spreading on fibronectin. These defect is rescued by expression of wild-type chicken c-Src. Analyses of mutants suggest that c-Src increases the rate of cell spreading in src-/- fibroblasts through a kinase-independent mechanism requiring both the SH3 and SH2 domains. To further address the role of c-Src in adhesion, we examined the activity and subcellular distribution of c-Src during the adhesion of fibroblasts on fibronectin. We observed a transient increase in the specific kinase activity of c-Src accompanied by the partial dephosphorylation of the negative regulatory site Y527. Activation of c-Src is followed by its redistribution to newly formed focal adhesions. These results suggest that the enzymatic activity and subcellular distribution of c-Src are coordinately regulated during cellular adhesion and that c-Src can affect adhesion by a kinase-independent mechanism.

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