The function of NLGN3 (neuroligin 3, ENSG00000196338) is as follows. Cell surface protein involved in cell-cell-interactions via its interactions with neurexin family members. Plays a role in synapse function and synaptic signal transmission, and may mediate its effects by clustering other synaptic proteins. May promote the initial formation of synapses, but is not essential for this. May also play a role in glia-glia or glia-neuron interactions in the developing peripheral nervous system (By similarity). {ECO:0000250, ECO:0000269|PubMed:15620359}.