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 L-ascorbate + H2O2
L-galactonolactone oxidase
Identifiers
EC number1.3.3.12
CAS number69403-13-0
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum

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 donor 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.


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