Predicted to enable several functions, including anion binding activity; calcium-dependent phospholipid binding activity; and metal ion binding activity. Acts upstream of or within spontaneous neurotransmitter secretion. Predicted to be located in several cellular components, including dendritic spine; postsynaptic membrane; and secretory vesicle. Predicted to be extrinsic component of membrane. Predicted to be part of protein-containing complex. Predicted to colocalize with Golgi apparatus. Is expressed in hindbrain; medulla oblongata; and midbrain. Orthologous to human RPH3A (rabphilin 3A). [provided by Alliance of Genome Resources, Apr 2022]