Predicted to enable guanyl-nucleotide exchange factor activity. Predicted to be involved in vesicle-mediated transport. Predicted to be located in lysosome and membrane. Predicted to be part of Mon1-Ccz1 complex. Predicted to be active in intracellular membrane-bounded organelle. Is expressed in several structures, including central nervous system; limb mesenchyme; neural retina; skeletal musculature; and tooth. Orthologous to several human genes including CCZ1 (CCZ1 homolog, vacuolar protein trafficking and biogenesis associated). [provided by Alliance of Genome Resources, Apr 2022]