What is "allantoinase"

n. (context enzyme English) An enzyme that produces allantoate as part of purine metabolism.

In enzymology, an allantoinase is an enzyme that catalyzes the chemical reaction

(S)-allantoin + HO $\rightleftharpoons$ allantoate

Thus, the two substrates of this enzyme are (S)-allantoin and HO, whereas its product is allantoate.

This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amides. The systematic name of this enzyme class is (S)-allantoin amidohydrolase. This enzyme participates in purine metabolism.