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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

1.2.1 With NAD⁺ or NADP⁺ as acceptor

1.2.2 With a cytochrome as acceptor

1.2.3 With oxygen as acceptor

1.2.4 With a disulfide as acceptor

1.2.4.1 pyruvate dehydrogenase (acetyl-transferring)

1.2.4.2 oxoglutarate dehydrogenase (succinyl-transferring)

1.2.4.3 created 1972, deleted 1978

1.2.4.4 3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring)

1.2.5 With a quinone or similar compound as acceptor

1.2.7 With an iron-sulfur protein as acceptor

1.2.98 With other, known, physiological acceptors

1.2.99 With unknown physiological acceptors

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

1.7 Acting on other nitrogenous compounds as donors

1.7.1 With NAD⁺ or NADP⁺ as acceptor

1.7.1.1 nitrate reductase (NADH)

1.7.1.2 nitrate reductase [NAD(P)H]

1.7.1.3 nitrate reductase (NADPH)

1.7.1.4 nitrite reductase [NAD(P)H]

1.7.1.5 hyponitrite reductase

1.7.1.6 azobenzene reductase

1.7.1.7 GMP reductase

1.7.1.8 created 2002, deleted 2002

1.7.1.9 nitroquinoline-N-oxide reductase

1.7.1.10 hydroxylamine reductase (NADH)

1.7.1.11 4-(dimethylamino)phenylazoxybenzene reductase

1.7.1.12 N-hydroxy-2-acetamidofluorene reductase

1.7.1.13 preQ₁ synthase

1.7.1.14 nitric oxide reductase [NAD(P)⁺, nitrous oxide-forming]

1.7.1.15 nitrite reductase (NADH)

1.7.1.16 nitrobenzene nitroreductase

1.7.1.17 FMN-dependent NADH-azoreductase

1.7.2 With a cytochrome as acceptor

1.7.3 With oxygen as acceptor

1.7.5 With a quinone or similar compound as acceptor

1.7.6 With a nitrogenous group as acceptor

1.7.7 With an iron-sulfur protein as acceptor

1.7.9 With a copper protein as acceptor

1.7.99 With unknown physiological acceptors

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)

1.13.1. undefined

1.13.11 With incorporation of two atoms of oxygen

1.13.12 With incorporation of one atom of oxygen (internal monooxygenases or internal mixed-function oxidases)

1.13.99 Miscellaneous

1.13.99.1 inositol oxygenase

1.13.99.2 created 1972, deleted 1992

1.13.99.3 tryptophan 2′-dioxygenase

1.13.99.4 created 1989, deleted 1992

1.13.99.5 created 1999, deleted 2001

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)

1.98.1. undefined

1.99 Other enzymes using O₂ as oxidant (deleted subclass)