The function of Ensembl gene identifier ENSG00000122674 (CCZ1, CCZ1 vacuolar protein trafficking and biogenesis associated) is as follows. Acts in concert with MON1A, as a guanine exchange factor (GEF) for RAB7, promotes the exchange of GDP to GTP, converting it from an inactive GDP-bound form into an active GTP-bound form (PubMed:23084991). .