Original Article

Coupling of Gab1 to c-Met, Grb2, and Shp2 Mediates Biological Responses

Correspondence to: Ute Schaeper, Max Delbrück Center for Molecular Medicine Berlin-Buch, Robert Rössle Str. 10, 13092 Berlin, Germany. Tel:49 30 9406 3810 Fax:49 30 9406 2656 E-mail:uschaep{at}mdc-berlin.de.

Gab1 is a substrate of the receptor tyrosine kinase c-Met and involved in c-Met–specific branching morphogenesis. It associates directly with c-Met via the c-Met–binding domain, which is not related to known phosphotyrosine-binding domains. In addition, Gab1 is engaged in a constitutive complex with the adaptor protein Grb2. We have now mapped the c-Met and Grb2 interaction sites using reverse yeast two-hybrid technology. The c-Met–binding site is localized to a 13–amino acid region unique to Gab1. Insertion of this site into the Gab1-related protein p97/Gab2 was sufficient to confer c-Met–binding activity. Association with Grb2 was mapped to two sites: a classical SH3-binding site (PXXP) and a novel Grb2 SH3 consensus-binding motif (PX(V/I)(D/N)RXXKP). To detect phosphorylation-dependent interactions of Gab1 with downstream substrates, we developed a modified yeast two-hybrid assay and identified PI(3)K, Shc, Shp2, and CRKL as interaction partners of Gab1. In a trk-met-Gab1–specific branching morphogenesis assay, association of Gab1 with Shp2, but not PI(3)K, CRKL, or Shc was essential to induce a biological response in MDCK cells. Overexpression of a Gab1 mutant deficient in Shp2 interaction could also block HGF/SF-induced activation of the MAPK pathway, suggesting that Shp2 is critical for c-Met/Gab1-specific signaling.

Key Words: Gab1, c-Met–binding site, morphogenesis, Shp2, reverse yeast two-hybrid analysis

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