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Volume 272, Number 33, Issue of August 15, 1997 pp. 20811-20819
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Association of the Multisubstrate Docking Protein Gab1 with the Hepatocyte Growth Factor Receptor Requires a Functional Grb2 Binding Site Involving Tyrosine 1356

(Received for publication, December 20, 1996, and in revised form, May 16, 1997)

Linh Nguyen a , Marina Holgado-Madruga cd , Christiane Maroun a , Elizabeth D. Fixman a , Darren Kamikura a , Tanya Fournier ah , Alain Charest h , Michel L. Tremblay h , Albert J. Wong cd and Morag Park ahj

From the Departments of a Medicine, j Oncology, and h Biochemistry, Molecular Oncology Group, Royal Victoria Hospital, McGill University, 687 Pine Ave. West, Montreal, Quebec, Canada H3A 1A1 and the Departments of c Microbiology & Immunology and d Pharmacology, Kimmel Cancer Institute, Philadelphia, Pennsylvania 19107

Hepatocyte growth factor/scatter factor is a multifunctional factor that induces mitogenesis, motility, invasion, and branching tubulogenesis of several epithelial and endothelial cell lines in culture. The receptor for hepatocyte growth factor has been identified as the Met-tyrosine kinase. Upon stimulation with hepatocyte growth factor, the Met beta  subunit becomes highly phosphorylated on tyrosine residues, one of which, tyrosine 1356 within the carboxyl terminus, is crucial for dissociation, motility, and branching tubule formation in Madin-Darby canine kidney epithelial cells. Tyrosine 1356 forms a multisubstrate binding site for the Grb2 and Shc adaptor proteins, the p85 subunit of phosphatidylinositol 3'-kinase, phospholipase Cgamma , and a phosphatase, SHP2. To investigate additional signaling molecules that are activated by the Met receptor, we have identified hepatocyte growth factor-induced phosphoproteins in tubular epithelial cells. We have established that proteins of 100-130 kDa are highly phosphorylated following stimulation of epithelial cells and that one of these is the Grb2-associated binding protein Gab1, a possible insulin receptor substrate-1-like signal transducer. We show that Gab1 is the major substrate for the Met kinase in vitro and in vivo. Association of Gab1 with Met requires a functional Grb2 binding site involving tyrosine 1356 and to a lesser extent tyrosine 1349. Met receptor mutants that fail to induce branching tubulogenesis are impaired in their ability to interact with Gab1, suggesting that Gab1 may play a role in these processes.


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