The enzyme xylono-1,4-lactonase (EC 3.1.1.68) catalyzes the reaction
This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name of this enzyme class is <small>D</small>-xylono-1,4-lactone lactonohydrolase. Other names in common use include xylono-ó-lactonase, and xylonolactonase. This enzyme participates in pentose and glucuronate interconversions.