What is "adenosine-tetraphosphatase"

In enzymology, an adenosine-tetraphosphatase is an enzyme that catalyzes the chemical reaction

adenosine 5'-tetraphosphate + HO $\rightleftharpoons$ ATP + phosphate

Thus, the two substrates of this enzyme are adenosine 5'-tetraphosphate and HO, whereas its two products are ATP and phosphate.

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 adenosine-tetraphosphate phosphohydrolase. This enzyme participates in purine metabolism.