title: DOS, a novel pleckstrin homology domain-containing protein required for signal transduction between sevenless and Ras1 in Drosophila.
abstract: The specification of the R7 photoreceptor cell in the developing eye of Drosophila is dependent upon activation of the Sevenless (SEV) receptor tyrosine kinase. By screening for mutations that suppress signaling via a constitutively activated SEV protein, we have identified a novel gene, daughter of sevenless (dos). DOS is required not only for signal transduction via SEV but also in other receptor tyrosine kinase signaling pathways throughout development. The presence of an amino-terminally located pleckstrin homology domain and many potential tyrosine phosphorylation sites suggests that DOS functions as an adaptor protein able to interact with multiple signaling molecules. Our genetic analysis demonstrates that DOS functions upstream of Ras1 and defines a signaling pathway that is independent of direct binding of the DRK SH2/SH3 adaptor protein to the SEV receptor tyrosine kinase.
authors.affiliation: Theodor Boveri Institut für Biowissenschaften, Lehstuhl für Genetik, Universität Würzburg, Federal Republic of Germany.
authors.forename: T
authors.initials: T
authors.lastname: Raabe
authors.forename: J
authors.initials: J
authors.lastname: Riesgo-Escovar
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: B S
authors.initials: BS
authors.lastname: Bausenwein
authors.forename: P
authors.initials: P
authors.lastname: Deak
authors.forename: P
authors.initials: P
authors.lastname: Maröy
authors.forename: E
authors.initials: E
authors.lastname: Hafen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D030801:Animals, Genetically Modified; D001665:Binding Sites; D001798:Blood Proteins; D003433:Crosses, Genetic; D004330:Drosophila / Q000196:embryology / Q000235:genetics*; D029721:Drosophila Proteins; D005123:Eye / Q000737:chemistry; D005136:Eye Proteins / Q000032:analysis / Q000235:genetics* / Q000502:physiology*; D005260:Female; D017344:Genes, Insect / Q000235:genetics; D016153:Genes, Suppressor; D007301:Insect Hormones / Q000235:genetics / Q000378:metabolism; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000502:physiology*; D008969:Molecular Sequence Data; D009154:Mutation; D010750:Phosphoproteins; D017956:Photoreceptor Cells, Invertebrate / Q000254:growth & development; D020794:Receptor Protein-Tyrosine Kinases / Q000502:physiology; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction / Q000502:physiology*; D014921:Wings, Animal / Q000254:growth & development; D018631:ras Proteins / Q000235:genetics* / Q000502:physiology
chemical_list: D001798:Blood Proteins; C100319:Dos protein, Drosophila; D029721:Drosophila Proteins; D005136:Eye Proteins; D007301:Insect Hormones; D008562:Membrane Glycoproteins; D010750:Phosphoproteins; C080530:drk protein, Drosophila; C039077:platelet protein P47; D020794:Receptor Protein-Tyrosine Kinases; C056737:sev protein, Drosophila; D018631:ras Proteins