Vacuolar fusion protein MON1

UniProtKB accession:  P53129

Grouped By:  Matching UniProtKB accession

UniProtKB description:  In complex with CCZ1, is required for multiple vacuole delivery pathways including the cytoplasm to vacuole transport (Cvt), autophagy, pexophagy and endocytosis. The MON1-CCZ1 complex acts at the fusion of vesicles with the vacuole, through its regulation of the SNARE complex during the coordinated priming and docking stages of fusion, and particularly at the stage of tethering/docking (PubMed:12134085, PubMed:12364329, PubMed:12387888, PubMed:14662743, PubMed:15721293, PubMed:32391792, PubMed:37463208). The MON1-CCZ1 complex is recruited to membranes enriched in charged lipids, particularly phosphatidylinositol 3-phosphate (PtdIns[3]P), by GTP-associated small GTPase RAB5 homologs (YPT10, YPT52, YPT53 and VPS21) (PubMed:32391792). The MON1-CCZ1 complex recruits GDP-associated small GTPase YPT7 to membranes and acts as a guanine nucleotide-exchange factor (GEF), promoting nucleotide-exchange on YPT7 and triggering endosomal maturation by recruiting downstream effectors such as components of the HOPS tethering complex (PubMed:20797862, PubMed:32391792).