Enables several functions, including cell adhesion molecule binding activity; identical protein binding activity; and neurexin family protein binding activity. Involved in several processes, including modulation of chemical synaptic transmission; positive regulation of cellular component organization; and synapse organization. Acts upstream of or within synapse organization. Located in several cellular components, including Golgi apparatus; dendrite; and filopodium tip. Is active in glutamatergic synapse. Is integral component of postsynaptic specialization membrane. Biomarker of status epilepticus. Orthologous to human NLGN1 (neuroligin 1). [provided by Alliance of Genome Resources, Apr 2022]