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Mol. Biol. Cell 12 (3): 615-627

Copyright © 2001 by The American Society for Cell Biology.

Vol. 12, Issue 3, 615-627, March 2001

GIPC and GAIP Form a Complex with TrkA: A Putative Link between G Protein and Receptor Tyrosine Kinase Pathways

Xiaojing Lou,*dagger Hiroko Yano,dagger Dagger Francis Lee,§ Moses V. Chao,Dagger and Marilyn Gist Farquhar*||

 *Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California 92093;  Dagger Skirball Institute of Biomolecular Medicine, New York University, New York, New York 10016; and  §Department of Psychiatry, Weill Medical College of Cornell University, New York, New York 10021

NGF initiates the majority of its neurotrophic effects by promoting the activation of the tyrosine kinase receptor TrkA. Here we describe a novel interaction between TrkA and GIPC, a PDZ domain protein. GIPC binds to the juxtamembrane region of TrkA through its PDZ domain. The PDZ domain of GIPC also interacts with GAIP, an RGS (regulators of G protein signaling) protein. GIPC and GAIP are components of a G protein-coupled signaling complex thought to be involved in vesicular trafficking. In transfected HEK 293T cells GIPC, GAIP, and TrkA form a coprecipitable protein complex. Both TrkA and GAIP bind to the PDZ domain of GIPC, but their binding sites within the PDZ domain are different. The association of endogenous GIPC with the TrkA receptor was confirmed by coimmunoprecipitation in PC12 (615) cells stably expressing TrkA. By immunofluorescence GIPC colocalizes with phosphorylated TrkA receptors in retrograde transport vesicles located in the neurites and cell bodies of differentiated PC12 (615) cells. These results suggest that GIPC, like other PDZ domain proteins, serves to cluster transmembrane receptors with signaling molecules. When GIPC is overexpressed in PC12 (615) cells, NGF-induced phosphorylation of mitogen-activated protein (MAP) kinase (Erk1/2) decreases; however, there is no effect on phosphorylation of Akt, phospholipase C-gamma 1, or Shc. The association of TrkA receptors with GIPC and GAIP plus the inhibition of MAP kinase by GIPC suggests that GIPC may provide a link between TrkA and G protein signaling pathways.

dagger X.L. and H.Y. contributed equally to this work.

|| Corresponding author. E-mail address: mfarquhar{at}

Molecular Biology of the Cell
Vol. 12, 615-627, March 2001
Copyright © 2001 by The American Society for Cell Biology

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