In enzymology, a gluconolactonase (EC 184.108.40.206) is an enzyme that catalyzes the chemical reaction
- D-glucono-1,5-lactone + H2O D-gluconate
Thus, the two substrates of this enzyme are D-glucono-1,5-lactone and H2O, whereas its product is D-gluconate.
This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name of this enzyme class is D-glucono-1,5-lactone lactonohydrolase. Other names in common use include lactonase, aldonolactonase, glucono-delta-lactonase, and gulonolactonase. This enzyme participates in 3 metabolic pathways: pentose phosphate pathway, ascorbate and aldarate metabolism, and caprolactam degradation.
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- Bublitz C; Lehninger AL (1961). "The role of aldonolactonase in the conversion of L-gulonate to L-ascorbate". Biochim. Biophys. Acta. 47 (2): 288–297. doi:10.1016/0006-3002(61)90289-X.
- Suzuki K, Kawada M, Shimazono N. "Soluble lactonase. Identity of lactonase I and aldonolactonase with gluconolactonase". J. Tokyo. Biochem.: 448–449.