What is "d-arabinonolactonase"

In enzymology, a D-arabinonolactonase is an enzyme that catalyzes the chemical reaction

D-arabinono-1,4-lactone + HO $\rightleftharpoons$ D-arabinonate

Thus, the two substrates of this enzyme are D-arabinono-1,4-lactone and HO, whereas its product is D-arabinonate.

This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name of this enzyme class is D-arabinono-1,4-lactone lactonohydrolase.