title: Identification of phosphorylated proteins associated with the fibroblast growth factor receptor type I during early Xenopus development.
abstract: Signaling through the FGF receptor (FGFR) is required for mesoderm induction in Xenopus. Some of the downstream signaling molecules implicated in this developmental process include Ras, Raf and MAP kinase. In a previous report, we demonstrated that PLC gamma 1, Grb-2, SOS and Nck were associated with activated FGFR1s in a signaling complex in Xenopus blastulae. In addition, several unidentified phosphotyrosylproteins were present in the FGFR1 complex. Here we identify three of these proteins as Ras-GAP, the p85 of P13'K and SHP2, while demonstrating that c-Src and She were not associated with the FGFR1. Furthermore, we show that three additional phosphotyrosylproteins from the FGFR1 complex specifically bound to the adaptor molecule Nck.
authors.affiliation: Terry Fox Cancer Research Laboratories, Division of Basic Medical Sciences, Memorial University of Newfoundland, St. John's, Canada.
authors.forename: P J
authors.initials: PJ
authors.lastname: Ryan
authors.forename: G D
authors.initials: GD
authors.lastname: Paterno
authors.forename: L L
authors.initials: LL
authors.lastname: Gillespie
mesh_terms: D000818:Animals; D001755:Blastocyst; D004627:Embryonic Induction; D020690:GTPase-Activating Proteins; D047908:Intracellular Signaling Peptides and Proteins; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D010750:Phosphoproteins / Q000378:metabolism; D011233:Precipitin Tests; D011485:Protein Binding; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism*; D020794:Receptor Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1; D017468:Receptors, Fibroblast Growth Factor / Q000378:metabolism*; D015398:Signal Transduction; D014982:Xenopus laevis / Q000196:embryology; D020703:ras GTPase-Activating Proteins
chemical_list: D020690:GTPase-Activating Proteins; D047908:Intracellular Signaling Peptides and Proteins; D010750:Phosphoproteins; D011506:Proteins; D017468:Receptors, Fibroblast Growth Factor; D020703:ras GTPase-Activating Proteins; D019869:Phosphatidylinositol 3-Kinases; D020794:Receptor Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases