Lactone hydrolase that is required for the degradation of monocyclic monoterpenes such as menthol and carvone. Catalyzes the ring opening of lactones formed during degradation of monocyclic monoterpenes. Can hydrolyze epsilon-caprolactone, the lactone derivatives of dihydrocarvone (4R)-4-isopropenyl-7-methyl-2-oxo-oxepanone and (6R)-6-isopropenyl-3-methyl-2-oxo-oxepanone, and ethyl caproate. 4-isopropenyl-7-methyloxepan-2-one + H2O = 6-hydroxy-3-isopropenylheptanoate + H(+) 7-isopropyl-4-methyloxepan-2-one + H2O = 6-hydroxy-3,7-dimethyloctanoate + H(+) Strongly inhibited by the imidazole-modifying compound 2-bromo-4'-nitroacetophenone, by HgCl(2) and CoCl(2). Not inhibited by the thiol reagents iodoacetate and dithiothreitol. Optimum pH is 9.5. Optimum temperature is 30 degrees Celsius. Inactivated above 40 degrees Celsius. Monomer. Belongs to the 'GDXG' lipolytic enzyme family.