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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Drosophila melanogaster auxilin regulates the internalization of Delta to control activity of the Notch signaling pathway.

We have isolated mutations in the Drosophila melanogaster homologue of auxilin, a J-domain-containing protein known to cooperate with Hsc70 in the disassembly of clathrin coats from clathrin-coated vesicles in vitro. Consistent with this biochemical role, animals with reduced auxilin function exhibit genetic interactions with Hsc70 and clathrin. Interestingly, the auxilin mutations interact specifically with Notch and disrupt several Notch-mediated processes. Genetic evidence places auxilin function in the signal-sending cells, upstream of Notch receptor activation, suggesting that the relevant cargo for this auxilin- mediated endocytosis is the Notch ligand Delta. Indeed, the localization of Delta protein is disrupted in auxilin mutant tissues. Thus, our data suggest that auxilin is an integral component of the Notch signaling pathway, participating in the ubiquitin-dependent endocytosis of Delta. Furthermore, the fact that auxilin is required for Notch signaling suggests that ligand endocytosis in the signal-sending cells needs to proceed past coat disassembly to activate Notch.[1]

References

  1. Drosophila melanogaster auxilin regulates the internalization of Delta to control activity of the Notch signaling pathway. Hagedorn, E.J., Bayraktar, J.L., Kandachar, V.R., Bai, T., Englert, D.M., Chang, H.C. J. Cell Biol. (2006) [Pubmed]
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