Predicted to enable metal ion binding activity and small GTPase binding activity. Predicted to be involved in calcium-dependent activation of synaptic vesicle fusion and positive regulation of calcium ion-dependent exocytosis. Predicted to act upstream of or within exocytosis and intracellular protein transport. Predicted to be located in transport vesicle membrane. Predicted to be active in synapse. Orthologous to human RPH3AL (rabphilin 3A like (without C2 domains)).