Predicted to enable SH3 domain binding activity. Involved in several processes, including cell-cell junction organization; neuronal action potential propagation; and synapse organization. Acts upstream of or within neuron projection development. Located in paranode region of axon and septate junction. Is expressed in optic nerve; sciatic nerve; and spinal cord. Human ortholog(s) of this gene implicated in lethal congenital contracture syndrome. Orthologous to human CNTNAP1 (contactin associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]