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© Research
Publication : Molecular and cellular biology

Functional analysis of the NHR2 domain indicates that oligomerization of Neuralized regulates ubiquitination and endocytosis of Delta during Notch signaling

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular and cellular biology - 08 Oct 2012

Liu S, Bonner JM, Chanet S, Commisso C, Skwarek LC, Schweisguth F, Boulianne GL

Link to Pubmed [PMID] – 23045391

Mol. Cell. Biol. 2012 Dec;32(24):4933-45

The Notch pathway plays an integral role in development by regulating cell fate in a wide variety of multicellular organisms. A critical step in the activation of Notch signaling is the endocytosis of the Notch ligands Delta and Serrate. Ligand endocytosis is regulated by one of two E3 ubiquitin ligases, Neuralized (Neur) or Mind bomb. Neur is comprised of a C-terminal RING domain, which is required for Delta ubiquitination, and two Neur homology repeat (NHR) domains. We have previously shown that the NHR1 domain is required for Delta trafficking. Here we show that the NHR1 domain also affects the binding and internalization of Serrate. Furthermore, we show that the NHR2 domain is required for Neur function and that a point mutation in the NHR2 domain (Gly430) abolishes Neur ubiquitination activity and affects ligand internalization. Finally, we provide evidence that Neur can form oligomers in both cultured cells and fly tissues, which regulate Neur activity and, by extension, ligand internalization.

http://www.ncbi.nlm.nih.gov/pubmed/23045391