Enables cell adhesion molecule binding activity; neurexin family protein binding activity; and signaling receptor activity. Involved in several processes, including inhibitory postsynaptic potential; neuron cell-cell adhesion; and synapse assembly. Acts upstream of or within synapse organization. Located in several cellular components, including cell surface; endocytic vesicle; and neuronal cell body. Is integral component of postsynaptic membrane. Is active in GABA-ergic synapse and glutamatergic synapse. Is integral component of postsynaptic specialization membrane. Colocalizes with dendrite; excitatory synapse; and inhibitory synapse. Used to study autism spectrum disorder. Biomarker of sciatic neuropathy. Human ortholog(s) of this gene implicated in Asperger syndrome and autistic disorder. Orthologous to human NLGN3 (neuroligin 3). [provided by Alliance of Genome Resources, Apr 2022]