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EC 1.3.3.12 Details

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EC number

1.3.3.12

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

CAS registry number

69403-13-0

Comment

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 1.1.3.8 L-gulonolactone oxidase. (cf. EC 1.3.2.3 galactonolactone dehydrogenase).

History

created 1984 as EC 1.1.3.24, transferred 2006 to EC 1.3.3.12

EC Tree

1 Oxidoreductases

1.1 Acting on the CH-OH group of donors

1.2 Acting on the aldehyde or oxo group of donors

1.3 Acting on the CH-CH group of donors

1.3.1 With NAD⁺ or NADP⁺ as acceptor

1.3.2 With a cytochrome as acceptor

1.3.2.1 created 1961, deleted 1964

1.3.2.2 created 1961, deleted 1964

1.3.2.3 L-galactonolactone dehydrogenase

1.3.3 With oxygen as acceptor

1.3.3.1 dihydroorotate oxidase

1.3.3.2 created 1972, deleted 2005

1.3.3.3 coproporphyrinogen oxidase

1.3.3.4 protoporphyrinogen oxidase

1.3.3.5 bilirubin oxidase

1.3.3.6 acyl-CoA oxidase

1.3.3.7 dihydrouracil oxidase

1.3.3.8 tetrahydroberberine oxidase

1.3.3.9 secologanin synthase

1.3.3.10 tryptophan α,β-oxidase

1.3.3.11 pyrroloquinoline-quinone synthase

1.3.3.12 L-galactonolactone oxidase

1.3.3.13 albonoursin synthase

1.3.3.14 aclacinomycin-A oxidase

1.3.3.15 coproporphyrinogen III oxidase (coproporphyrin-forming)

1.3.3.16 oxazoline dehydrogenase

1.3.3.17 benzylmalonyl-CoA dehydrogenase

1.3.4 With a disulfide as acceptor

1.3.5 With a quinone or related compound as acceptor

1.3.7 With an iron-sulfur protein as acceptor

1.3.8 With a flavin as acceptor

1.3.98 With other, known, physiological acceptors

1.3.99 With unknown physiological acceptors

1.4 Acting on the CH-NH₂ group of donors

1.5 Acting on the CH-NH group of donors

1.6 Acting on NADH or NADPH

1.7 Acting on other nitrogenous compounds as donors

1.8 Acting on a sulfur group of donors

1.9 Acting on a heme group of donors

1.10 Acting on diphenols and related substances as donors

1.11 Acting on a peroxide as acceptor

1.12 Acting on hydrogen as donor

1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)

1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen

1.15 Acting on superoxide as acceptor

1.16 Oxidizing metal ions

1.17 Acting on CH or CH₂ groups

1.18 Acting on iron-sulfur proteins as donors

1.19 Acting on reduced flavodoxin as donor

1.20 Acting on phosphorus or arsenic in donors

1.21 Catalysing the reaction X-H + Y-H = X-Y

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group as acceptor

1.23.1 With NADH or NADPH as donor

1.23.5 With a quinone or similar compound as acceptor

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)