Allantoin racemase

In enzymology, an allantoin racemase (EC 5.1.99.3) is an enzyme that catalyzes the chemical reaction

Hence, this enzyme has one substrate, (S)(+)-allantoin, and one product, (R)(-)-allantoin.

This enzyme belongs to the family of isomerases, specifically those racemases and epimerases acting on other compounds. The systematic name of this enzyme class is allantoin racemase. This enzyme participates in purine metabolism.