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We have identified mutations in Drosophila endophilin to study its function in vivo. Endophilin is required presynaptically at the neuromuscular junction, and absence of Endophilin dramatically impairs endocytosis in vivo. Mutant larvae that lack Endophilin fail to take up FM1-43 dye in synaptic boutons, indicating an inability to retrieve synaptic membrane. This defect is accompanied by an expansion...
Signaling through tyrosine kinase receptors (TKRs) is thought to be modulated by receptor-mediated endocytosis and degradation of the receptor in the lysosome. However, factors that regulate endosomal sorting of TKRs are largely unknown. Here, we demonstrate that Hrs (Hepatocyte growth factor-regulated tyrosine kinase substrate) is one such factor. Electron microscopy studies of hrs mutant larvae...
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