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© Research
Publication : Developmental cell

Bearded family members inhibit Neuralized-mediated endocytosis and signaling activity of Delta in Drosophila

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Developmental cell - 01 Feb 2006

Bardin AJ, Schweisguth F

Link to Pubmed [PMID] – 16459303

Dev. Cell 2006 Feb;10(2):245-55

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.

http://www.ncbi.nlm.nih.gov/pubmed/16459303