Deoxylimonate A-ring-lactonase

The enzyme deoxylimonate A-ring-lactonase (EC 3.1.1.46) catalyzes the reaction

deoxylimonate + H₂O ${\displaystyle \rightleftharpoons }$ deoxylimononic acid D-ring-lactone

The reaction opens the A-ring-lactone of the triterpenoid deoxylimonic acid, leaving the D-ring-lactone intact.

This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name is deoxylimonate A-ring-lactonohydrolase.

• Hasegawa H, Bennett RD, Verdon CP (1980). "Metabolism of limonoids via a deoxylimonoid pathway in Citrus". Phytochemistry. 19: 1445–1447. doi:10.1016/0031-9422(80)80191-9.