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DENN domain-containing protein FAM45A regulates the homeostasis of late/multivesicular endosomes.

Biochim Biophys Acta Mol Cell Res. 2019-05; 
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DENN (differentially expressed in normal cells and neoplasia) domain-containing proteins are a family of guanine nucleotide exchange factors (GEFs) for Rab small GTPases and coordinate a plethora of intracellular membrane trafficking events. FAM45A is a non-classical DENN domain protein, whose function was unknown. In this study, we characterized cellular roles of FAM45A. We found that FAM45A localized mainly in late/multivesicular endosomes. Depletion of FAM45A resulted in clustering of endosomes to the perinuclear region. The endocytosis of EGF receptor was impaired in FAM45A knockdown cells due to a delay in the early-to-late endosome transition. Furthermore, the secretion of selected exosome subpopula... More


DENN domain,Endocytosis,Endosome,FAM45A,Membrane trafficking,Multivesicular endo