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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

1.4 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

1.6.1 With NAD⁺ or NADP⁺ as acceptor

1.6.1.1 NAD(P)⁺ transhydrogenase (Si-specific)

1.6.1.2 NAD(P)⁺ transhydrogenase (Re/Si-specific)

1.6.1.3 NAD(P)⁺ transhydrogenase

1.6.1.4 NAD(P)⁺ transhydrogenase (ferredoxin)

1.6.1.5 proton-translocating NAD(P)⁺ transhydrogenase

1.6.2 With a heme protein as acceptor

1.6.3 With oxygen as acceptor

1.6.4 With a disulfide as acceptor (deleted sub-subclass)

1.6.5 With a quinone or similar compound as acceptor

1.6.5.1 created 1961, deleted 1965

1.6.5.2 NAD(P)H dehydrogenase (quinone)

1.6.5.3 NADH:ubiquinone reductase (H⁺-translocating)

1.6.5.4 monodehydroascorbate reductase (NADH)

1.6.5.5 NADPH:quinone reductase

1.6.5.6 p-benzoquinone reductase (NADPH)

1.6.5.7 2-hydroxy-1,4-benzoquinone reductase

1.6.5.8 NADH:ubiquinone reductase (Na⁺-transporting)

1.6.5.9 NADH:quinone reductase (non-electrogenic)

1.6.5.10 NADPH dehydrogenase (quinone)

1.6.5.11 NADH dehydrogenase (quinone)

1.6.5.12 demethylphylloquinone reductase

1.6.6 With a nitrogenous group as acceptor

1.6.7 With an iron-sulfur protein as acceptor (deleted sub-subclass)

1.6.8 With a flavin as acceptor (deleted sub-subclass)

1.6.8.1 created 1981, deleted 2002

1.6.8.2 created 1982, deleted 2002

1.6.99 With unknown physiological acceptors

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

1.11.1 Peroxidases

1.11.1.1 NADH peroxidase

1.11.1.2 NADPH peroxidase

1.11.1.3 fatty-acid peroxidase

1.11.1.4 created 1961, deleted 1964, reinstated 1965 as EC 1.13.1.12, deleted 1972

1.11.1.5 cytochrome-c peroxidase

1.11.1.6 catalase

1.11.1.7 peroxidase

1.11.1.8 iodide peroxidase

1.11.1.9 glutathione peroxidase

1.11.1.10 chloride peroxidase

1.11.1.11 L-ascorbate peroxidase

1.11.1.12 phospholipid-hydroperoxide glutathione peroxidase

1.11.1.13 manganese peroxidase

1.11.1.14 lignin peroxidase

1.11.1.15 peroxiredoxin

1.11.1.16 versatile peroxidase

1.11.1.17 glutathione amide-dependent peroxidase

1.11.1.18 bromide peroxidase

1.11.1.19 dye decolorizing peroxidase

1.11.1.20 prostamide/prostaglandin F_2α synthase

1.11.1.21 catalase-peroxidase

1.11.1.22 hydroperoxy fatty acid reductase

1.11.1.23 (S)-2-hydroxypropylphosphonic acid epoxidase

1.11.1.24 thioredoxin-dependent peroxiredoxin

1.11.1.25 glutaredoxin-dependent peroxiredoxin

1.11.1.26 NADH-dependent peroxiredoxin

1.11.1.27 glutathione-dependent peroxiredoxin

1.11.1.28 lipoyl-dependent peroxiredoxin

1.11.1.29 mycoredoxin-dependent peroxiredoxin

1.11.2 Peroxygenases

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

1.21.1 With NAD⁺ or NADP⁺ as acceptor

1.21.3 With oxygen as acceptor

1.21.4 With a disulfide as acceptor

1.21.98 With other, known, physiological acceptors

1.21.99 With unknown physiological acceptors

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group 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)

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Release 2023.1 (January 2023)