IUBMB Enzyme Nomenclature



Accepted name: L-galactonolactone oxidase

Reaction: L-galactono-1,4-lactone + O2 = L-ascorbate + H2O2

Other name(s): L-galactono-1,4-lactone oxidase

Systematic name: L-galactono-1,4-lactone:oxygen 3-oxidoreductase

Comments: A flavoprotein. Acts on the 1,4-lactones of L-galactonic, D-altronic, L-fuconic, D-arabinic and D-threonic acids; not identical with EC L-gulonolactone oxidase. (cf. EC galactonolactone dehydrogenase).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Bleeg, H.S. and Christensen, F. 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 (1982) 391-396. [PMID: 6754380]

[EC created 1984 as EC, transferred 2006 to EC]

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