The role of focal adhesion kinase binding in the regulation of tyrosine phosphorylation of paxillin

Jeffrey W. Thomas, Marion Anne Cooley, Jill M. Broome, Ravi Salgia, James D. Griffin, Christian R. Lombardo, Michael D. Schaller

Research output: Contribution to journalArticle

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Abstract

Focal adhesion kinase (FAK) and paxillin are focal adhesion-associated, phosphotyrosine-containing proteins that physically interact. A previous study has demonstrated that paxillin contains two binding sites for FAK. We have further characterized these two binding sites and have demonstrated that the binding affinity of the carboxyl-terminal domain of FAK is the same for each of the two binding sites. The presence of both binding sites increases the affinity for FAK by 5-10-fold. A conserved paxillin sequence called the LD motif has been implicated in FAK binding. We show that mutations in the LD motifs in both FAK-binding sites are required to dramatically impair FAK binding in vitro. A paxillin mutant containing point mutations in both FAK- binding sites was characterized. The mutant exhibited reduced levels of phosphotyrosine relative to wild type paxillin in subconfluent cells growing in culture, following cell adhesion to fibronectin and in src-transformed fibroblasts. These results suggest that paxillin must bind FAK for maximal phosphorylation in response to cell adhesion and that FAK may function to direct tyrosine phosphorylation of paxillin in the process of transformation by the src oncogene.

Original languageEnglish (US)
Pages (from-to)36684-36692
Number of pages9
JournalJournal of Biological Chemistry
Volume274
Issue number51
DOIs
StatePublished - Dec 17 1999

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Paxillin
Focal Adhesion Protein-Tyrosine Kinases
Phosphorylation
Tyrosine
Binding Sites
Phosphotyrosine
Cell adhesion
Cell Adhesion
src Genes
Focal Adhesions
Conserved Sequence
Fibroblasts
Fibronectins
Point Mutation
Adhesion

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Thomas, J. W., Cooley, M. A., Broome, J. M., Salgia, R., Griffin, J. D., Lombardo, C. R., & Schaller, M. D. (1999). The role of focal adhesion kinase binding in the regulation of tyrosine phosphorylation of paxillin. Journal of Biological Chemistry, 274(51), 36684-36692. https://doi.org/10.1074/jbc.274.51.36684

The role of focal adhesion kinase binding in the regulation of tyrosine phosphorylation of paxillin. / Thomas, Jeffrey W.; Cooley, Marion Anne; Broome, Jill M.; Salgia, Ravi; Griffin, James D.; Lombardo, Christian R.; Schaller, Michael D.

In: Journal of Biological Chemistry, Vol. 274, No. 51, 17.12.1999, p. 36684-36692.

Research output: Contribution to journalArticle

Thomas, JW, Cooley, MA, Broome, JM, Salgia, R, Griffin, JD, Lombardo, CR & Schaller, MD 1999, 'The role of focal adhesion kinase binding in the regulation of tyrosine phosphorylation of paxillin', Journal of Biological Chemistry, vol. 274, no. 51, pp. 36684-36692. https://doi.org/10.1074/jbc.274.51.36684
Thomas, Jeffrey W. ; Cooley, Marion Anne ; Broome, Jill M. ; Salgia, Ravi ; Griffin, James D. ; Lombardo, Christian R. ; Schaller, Michael D. / The role of focal adhesion kinase binding in the regulation of tyrosine phosphorylation of paxillin. In: Journal of Biological Chemistry. 1999 ; Vol. 274, No. 51. pp. 36684-36692.
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