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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

1.2.5 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

1.2.99.1 created 1961, deleted 1984

1.2.99.2 carbon-monoxide dehydrogenase (acceptor)

1.2.99.3 aldehyde dehydrogenase (pyrroloquinoline-quinone)

1.2.99.4 formaldehyde dismutase

1.2.99.5 formylmethanofuran dehydrogenase

1.2.99.6 carboxylate reductase

1.2.99.7 aldehyde dehydrogenase (FAD-independent)

1.2.99.8 glyceraldehyde dehydrogenase (FAD-containing)

1.2.99.9 formate dehydrogenase (coenzyme F₄₂₀)

1.2.99.10 4,4′-diapolycopenoate synthase

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

1.8 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

1.17.1 With NAD⁺ or NADP⁺ as acceptor

1.17.2 With a cytochrome as acceptor

1.17.3 With oxygen as acceptor

1.17.4 With a disulfide as acceptor

1.17.5 With a quinone or similar compound as acceptor

1.17.7 With an iron-sulfur protein as acceptor

1.17.8 With a flavin as acceptor

1.17.9 With a copper protein as acceptor

1.17.98 With other, known, physiological acceptors

1.17.99 With unknown physiological acceptors

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

1.20.1 With NAD⁺ or NADP⁺ as acceptor

1.20.2 With a cytochrome as acceptor

1.20.4 With disulfide as acceptor

1.20.9 With a copper protein as acceptor

1.20.98 With other, known, physiological acceptors

1.20.99 With unknown physiological acceptors

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

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)

3.1 Acting on ester bonds

3.2 Glycosylases

3.3 Acting on ether bonds

3.4 Acting on peptide bonds (peptidases)

3.5 Acting on carbon-nitrogen bonds, other than peptide bonds

3.6 Acting on acid anhydrides

3.7 Acting on carbon-carbon bonds

3.8 Acting on halide bonds

3.8.1 In carbon-halide compounds

3.8.1.1 alkylhalidase

3.8.1.2 (S)-2-haloacid dehalogenase

3.8.1.3 haloacetate dehalogenase

3.8.1.4 created 1984, deleted 2003

3.8.1.5 haloalkane dehalogenase

3.8.1.6 4-chlorobenzoate dehalogenase

3.8.1.7 4-chlorobenzoyl-CoA dehalogenase

3.8.1.8 atrazine chlorohydrolase

3.8.1.9 (R)-2-haloacid dehalogenase

3.8.1.10 2-haloacid dehalogenase (configuration-inverting)

3.8.1.11 2-haloacid dehalogenase (configuration-retaining)

3.8.2 In phosphorus-halide compounds (deleted sub-subclass)

3.9 Acting on phosphorus-nitrogen bonds

3.10 Acting on sulfur-nitrogen bonds

3.11 Acting on carbon-phosphorus bonds

3.12 Acting on sulfur-sulfur bonds

3.13 Acting on carbon-sulfur bonds

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Release 2023.1 (January 2023)