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Mol. Cell. Biol., May 1995, 2635-2645, Vol 15, No. 5
MD Schaller and JT Parsons
Paxillin, a focal-adhesion-associated protein, becomes phosphorylated in
response to a number of stimuli which also induce the tyrosine
phosphorylation of the focal-adhesion-associated protein tyrosine kinase
pp125FAK. On the basis of their colocalization and coordinate
phosphorylation, paxillin is a candidate for a substrate of pp125FAK. We
describe here conditions under which the phosphorylation of paxillin on
tyrosine is pp125FAK dependent, supporting the hypothesis that paxillin
phosphorylation is regulated by pp125FAK. pp125FAK must localize to focal
adhesions and become autophosphorylated to induce paxillin phosphorylation.
Phosphorylation of paxillin on tyrosine creates binding sites for the SH2
domains of Crk, Csk, and Src. We identify two sites of phosphorylation as
tyrosine residues 31 and 118, each of which conforms to the Crk SH2 domain
binding motif, (P)YXXP. These observations suggest that paxillin serves as
an adapter protein, similar to insulin receptor substrate 1, and that
pp125FAK may regulate the formation of signaling complexes by directing the
phosphorylation of paxillin on tyrosine.
Copyright © 1995, American Society for Microbiology
pp125FAK-dependent tyrosine phosphorylation of paxillin creates a high- affinity binding site for Crk
Department of Microbiology, University of Virginia, Charlottesville 22908, USA.
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