Predicted to enable GMP binding activity and GTP binding activity. Predicted to be involved in several processes, including Golgi to plasma membrane protein transport; exocrine system development; and regulation of protein catabolic process at presynapse, modulating synaptic transmission. Predicted to act upstream of or within protein transport. Located in secretory granule membrane. Orthologous to human RAB26 (RAB26, member RAS oncogene family). [provided by Alliance of Genome Resources, Apr 2022]