Predicted to enable GTP binding activity and GTPase activity. Predicted to be involved in several processes, including autophagosome assembly; endoplasmic reticulum to Golgi vesicle-mediated transport; and regulation of autophagosome assembly. Is active in synapse. Orthologous to several human genes including RAB1B (RAB1B, member RAS oncogene family). [provided by Alliance of Genome Resources, Apr 2022]