Enables PDZ domain binding activity and identical protein binding activity. Involved in several processes, including dendrite morphogenesis; response to caffeine; and response to hypoxia. Located in neuronal cell body. Colocalizes with synapse. Human ortholog(s) of this gene implicated in cleft lip and cleft palate. Orthologous to human SDC2 (syndecan 2). [provided by Alliance of Genome Resources, Apr 2022]