Neuronal cell surface protein thought to be involved in cell-cell-interactions by forming intercellular junctions through binding to beta-neurexins. May play a role in formation or maintenance of synaptic junctions. May also play a role in glia-glia or glia-neuron interactions in the developing peripheral nervous system.
Interacts with neurexin 1-beta, neurexin 2-beta and neurexin 3-beta (By similarity). Probably interacts through its C-terminus with DLG4/PSD-95 third PDZ domain.