Predicted to enable GTP binding activity and GTPase activity. Predicted to be involved in phagosome acidification and phagosome-lysosome fusion. Predicted to act upstream of or within autophagy and protein transport. Predicted to be located in phagocytic vesicle. Predicted to be active in Golgi membrane. Is expressed in brain; brainstem; eye; and testis. Orthologous to human RAB39A (RAB39A, member RAS oncogene family). [provided by Alliance of Genome Resources, Apr 2022]