- Source: L-galactonolactone oxidase
In enzymology, a L-galactonolactone oxidase (EC 1.3.3.12) is an enzyme that catalyzes the chemical reaction
L-galactono-1,4-lactone + O2
⇌
{\displaystyle \rightleftharpoons }
L-ascorbate + H2O2
Thus, the two substrates of this enzyme are L-galactono-1,4-lactone and O2, whereas its two products are L-ascorbic acid and H2O2.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donors with oxygen as acceptor. The systematic name of this enzyme class is L-galactono-1,4-lactone:oxygen 3-oxidoreductase. This enzyme is also called L-galactono-1,4-lactone oxidase. This enzyme participates in ascorbic acid and aldaric acid metabolism. It employs one cofactor, FAD.
References
Bleeg HS, Christensen F (1982). "Biosynthesis of ascorbate in yeast. Purification of L-galactono-1,4-lactone oxidase with properties different from mammalian L-gulonolactone oxidase". Eur. J. Biochem. 127 (2): 391–6. doi:10.1111/j.1432-1033.1982.tb06884.x. PMID 6754380.
