Can hydrolyze NAD but cannot hydrolyze nucleotide di- and triphosphates (By similarity). May play a role in neuronal cell communication. Lacks nucleotide pyrophosphatase and lysopholipase D activity in vitro (PubMed:12927778). Binds 2 Zn(2+) ions per subunit. Brain. N-glycosylated. Belongs to the nucleotide pyrophosphatase/phosphodiesterase family.