Type Iγ phosphatidylinositol phosphate kinase targets and regulates focal adhesions

Kun Ling, Renee L. Doughman, Ari J. Firestone, Matthew W. Bunce and Richard A. Anderson ()
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Kun Ling: University of Wisconsin Medical School
Renee L. Doughman: University of Wisconsin Medical School
Ari J. Firestone: University of Wisconsin Medical School
Matthew W. Bunce: University of Wisconsin Medical School
Richard A. Anderson: University of Wisconsin Medical School

Nature, 2002, vol. 420, issue 6911, 89-93

Abstract: Abstract The ability of cells to form cell contacts, adhere to the extracellular matrix, change morphology, and migrate is essential for development, wound healing, metastasis, cell survival and the immune response. These events depend on the binding of integrin to the extracellular matrix, and assembly of focal adhesions, which are complexes comprising scaffolding and signalling proteins organized by adhesion to the extracellular matrix1,2,3. Phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P2) regulates interactions between these proteins, including the interaction of vinculin with actin and talin4,5,6,7,8,9. The binding of talin to β-integrin is strengthened by PtdIns(4,5)P2, suggesting that the basis of focal adhesion assembly is regulated by this lipid mediator9,10. Here we show that the type I phosphatidylinositol phosphate kinase isoform-γ 661 (PIPKIγ661), an enzyme that makes PtdIns(4,5)P2, is targeted to focal adhesions by an association with talin. PIPKIγ661 is tyrosine phosphorylated by focal adhesion associated kinase signalling, increasing both the activity of phosphatidylinositol phosphate kinase and its association with talin. This defines a mechanism for spatial generation of PtdIns(4,5)P2 at focal adhesions.

Date: 2002
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DOI: 10.1038/nature01082

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