This enzyme belongs to the family of hydrolases, specifically those acting on acid anhydrides in phosphorus-containing anhydrides. The systematic name of this enzyme class is polyphosphate phosphohydrolase. Other names in common use include metaphosphatase, acid phosphoanhydride phosphohydrolase, and Gra-Pase. This enzyme participates in purine metabolism.
Malmgren H; Malmgren, H.; Åkerström, Å.; Finsnes, Ernst; Sörensen, JöRgine Stene; Sörensen, Nils Andreas (1952). "Enzymatic behavior of polymetaphosphate. V. Purification and specificity of the enzyme". Acta Chem. Scand.6: 16–26. doi:10.3891/acta.chem.scand.06-0016.