title: Bearded family members inhibit Neuralized-mediated endocytosis and signaling activity of Delta in Drosophila.
abstract: Endocytosis of Notch receptor ligands in signaling cells is essential for Notch receptor activation. In Drosophila, the E3 ubiquitin ligase Neuralized (Neur) promotes the endocytosis and signaling activity of the ligand Delta (Dl). In this study, we identify proteins of the Bearded (Brd) family as interactors of Neur. We show that Tom, a prototypic Brd family member, inhibits Neur-dependent Notch signaling. Overexpression of Tom inhibits the endocytosis of Dl and interferes with the interaction of Dl with Neur. Deletion of the Brd gene complex results in ectopic endocytosis of Dl in dorsal cells of stage 5 embryos. This defect in Dl trafficking is associated with ectopic expression of the single-minded gene, a direct Notch target gene that specifies the mesectoderm. We propose that inhibition of Neur by Brd proteins is important for precise spatial regulation of Dl signaling.
authors.affiliation: CNRS UMR 8542, Ecole Normale Supérieure, 46, rue d'Ulm, 75230 Paris Cedex, France.
authors.forename: Allison J
authors.initials: AJ
authors.lastname: Bardin
authors.forename: François
authors.initials: F
authors.lastname: Schweisguth
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D019521:Body Patterning / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004330:Drosophila / Q000196:embryology / Q000235:genetics / Q000378:metabolism*; D029721:Drosophila Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004705:Endocytosis; D017353:Gene Deletion; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect; D008024:Ligands; D008954:Models, Biological; D008969:Molecular Sequence Data; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D051880:Receptors, Notch / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D044767:Ubiquitin-Protein Ligases / Q000235:genetics / Q000378:metabolism*
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D008024:Ligands; D009687:Nuclear Proteins; D010750:Phosphoproteins; D051880:Receptors, Notch; D014157:Transcription Factors; D044767:Ubiquitin-Protein Ligases; C109219:Brd protein, Drosophila; C497759:N protein, Drosophila; C405938:Tom protein, Drosophila; C062236:dl protein, Drosophila; C089449:sim protein, Drosophila; C071006:neur protein, Drosophila