Predicted to enable neurexin family protein binding activity. Acts upstream of or within several processes, including long-term synaptic potentiation; negative regulation of receptor internalization; and positive regulation of synapse assembly. Predicted to be located in excitatory synapse. Predicted to be integral component of membrane. Predicted to be active in GABA-ergic synapse and extracellular space. Predicted to be integral component of postsynaptic specialization membrane. Is expressed in neural tube and neural tube lateral wall. Orthologous to human LRRTM2 (leucine rich repeat transmembrane neuronal 2). [provided by Alliance of Genome Resources, Apr 2022]