Research ArticleCell Biology

Tyrosine Phosphorylation of the Gα-Interacting Protein GIV Promotes Activation of Phosphoinositide 3-Kinase During Cell Migration

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Sci. Signal.  27 Sep 2011:
Vol. 4, Issue 192, pp. ra64
DOI: 10.1126/scisignal.2002049

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GIV (Gα-interacting vesicle-associated protein; also known as Girdin) enhances Akt activation downstream of multiple growth factor– and G protein (heterotrimeric guanosine 5′-triphosphate–binding protein)–coupled receptors to trigger cell migration and cancer invasion. We demonstrate that GIV is a tyrosine phosphoprotein that directly binds to and activates phosphoinositide 3-kinase (PI3K). Upon ligand stimulation of various receptors, GIV was phosphorylated at tyrosine-1764 and tyrosine-1798 by both receptor and non-receptor tyrosine kinases. These phosphorylation events enabled direct binding of GIV to the amino- and carboxyl-terminal Src homology 2 domains of p85α, a regulatory subunit of PI3K; stabilized receptor association with PI3K; and enhanced PI3K activity at the plasma membrane to trigger cell migration. Tyrosine phosphorylation of GIV and its association with p85α increased during metastatic progression of a breast carcinoma. These results suggest a mechanism by which multiple receptors activate PI3K through tyrosine phosphorylation of GIV, thereby making the GIV-PI3K interaction a potential therapeutic target within the PI3K-Akt pathway.

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