Enables PDZ domain binding activity. Involved in brain development and neural retina development. Located in membrane raft and parallel fiber. Is active in glutamatergic synapse and parallel fiber to Purkinje cell synapse. Is integral component of presynaptic membrane. Human ortholog(s) of this gene implicated in X-linked spinocerebellar ataxia 1. Orthologous to human ATP2B3 (ATPase plasma membrane Ca2+ transporting 3). [provided by Alliance of Genome Resources, Apr 2022]