Enables cell adhesion molecule binding activity and signaling receptor binding activity. Involved in heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules. Located in dendritic spine and postsynaptic membrane. Is active in glutamatergic synapse. Is extrinsic component of postsynaptic membrane. Orthologous to human TENM2 (teneurin transmembrane protein 2). [provided by Alliance of Genome Resources, Apr 2022]