Predicted to enable calcium ion binding activity. Acts upstream of or within positive regulation of synapse assembly and positive regulation of synaptic transmission. Located in cell surface; postsynaptic density; and postsynaptic membrane. Is integral component of postsynaptic density membrane. Is active in glutamatergic synapse. Is expressed in several structures, including brain; ear; forelimb bud; heart; and paraxial mesenchyme. Orthologous to human CLSTN2 (calsyntenin 2). [provided by Alliance of Genome Resources, Apr 2022]