Predicted to enable calcium ion binding activity. Involved in regulation of presynapse assembly. Acts upstream of or within several processes, including chemical synaptic transmission; positive regulation of protein localization to synapse; and positive regulation of synapse assembly. Located in several cellular components, including GABA-ergic synapse; postsynaptic density; and postsynaptic membrane. Part of protein-containing complex. Is active in glutamatergic synapse. Is integral component of postsynaptic density membrane. Is expressed in brain; central nervous system; cerebellum; and testis. Orthologous to human CLSTN3 (calsyntenin 3). [provided by Alliance of Genome Resources, Apr 2022]