FUNCTION: Guanine nucleotide exchange factor (GEF) activating RAB12. Promotes the exchange of GDP to GTP, converting inactive GDP-bound RAB12 into its active GTP-bound form (PubMed:20937701). Regulates autophagy in response to starvation through RAB12 activation. Starvation leads to ULK1/2-dependent...
FUNCTION: Guanine nucleotide exchange factor (GEF) activating RAB12. Promotes the exchange of GDP to GTP, converting inactive GDP-bound RAB12 into its active GTP-bound form (PubMed:20937701). Regulates autophagy in response to starvation through RAB12 activation. Starvation leads to ULK1/2-dependent phosphorylation of Ser-472 and Ser-490, which in turn allows recruitment of 14-3-3 adapter proteins and leads to up-regulation of GEF activity towards RAB12 (By similarity). Also plays a role in protein transport from recycling endosomes to lysosomes, regulating, for instance, the degradation of the transferrin receptor and of the amino acid transporter PAT4 (PubMed:20937701). Starvation also induces phosphorylation at Tyr-858, which leads to up-regulated GEF activity and initiates autophagy (By similarity). {ECO:0000250|UniProtKB:A2RT67, ECO:0000269|PubMed:20937701}.
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GO - Biological processes (BP):
cellular protein catabolic process [GO:0044257]; endosome to lysosome transport [GO:0008333]; regulation of Rab protein signal transduction [GO:0032483]...
cellular protein catabolic process [GO:0044257]; endosome to lysosome transport [GO:0008333]; regulation of Rab protein signal transduction [GO:0032483]
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GO - Molecular function (MF):
guanyl-nucleotide exchange factor activity [GO:0005085]...
guanyl-nucleotide exchange factor activity [GO:0005085]
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GO - Cellular component (CC):
cytoplasmic vesicle [GO:0031410]; cytosol [GO:0005829]...
cytoplasmic vesicle [GO:0031410]; cytosol [GO:0005829]
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