Ectonucleotide pyrophosphatase/phosphodiesterase family member 3 (ENPP3)

Hydrolase that metabolizes extracellular nucleotides, such as ATP, GTP, UTP and CTP (PubMed:29717535). Limits mast cell and basophil responses during inflammation and during the chronic phases of allergic reactions by eliminating the extracellular ATP that acts as signaling molecule and triggers basophils and mast cells and induces the release of inflammatory cytokines.

Metabolizes extracellular ATP in the lumen of the small intestine, and thereby prevents ATP-induced apoptosis of intestinal plasmacytoid dendritic cells (By similarity). Has also alkaline phosphodiesterase activity (PubMed:11342463).