Predicted to enable several functions, including GTPase activity; guanyl ribonucleotide binding activity; and myosin V binding activity. Involved in anterograde axonal protein transport; regulation of exocytosis; and synaptic vesicle endocytosis. Located in apical plasma membrane and zymogen granule membrane. Is anchored component of synaptic vesicle membrane. Orthologous to human RAB27B (RAB27B, member RAS oncogene family). [provided by Alliance of Genome Resources, Apr 2022]