Galpha13 stimulates cell migration through cortactin-interacting protein Hax-1

The Journal of Biological Chemistry
V RadhikaN Dhanasekaran

Abstract

Galpha13, the alpha-subunit of the heterotrimeric G protein G13, has been shown to stimulate cell migration in addition to inducing oncogenic transformation. Cta, a Drosophila ortholog of G13, has been shown to be critical for cell migration leading to the ventral furrow formation in Drosophila embryos. Loss of Galpha13 has been shown to disrupt cell migration associated with angiogenesis in developing mouse embryos. Whereas these observations point to the vital role of G13-orthologs in regulating cell migration, widely across the species barrier, the mechanism by which Galpha13 couples to cytoskeleton and cell migration is largely unknown. Here we show that Galpha13 physically interacts with Hax-1, a cytoskeleton-associated, cortactin-interacting intracellular protein, and this interaction is required for Galpha13-stimulated cell migration. Hax-1 interaction is specific to Galpha13, and this interaction is more pronounced with the mutationally or functionally activated form of Galpha13 as compared with the wild-type Galpha13. Expression of Hax-1 reduces the formation of actin stress fibers and focal adhesion complexes in Galpha13-expressing NIH3T3 cells. Coexpression of Hax-1 also attenuates Galpha(13)-stimulated activity of R...Continue Reading

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