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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

1.7 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

1.12.1 With NAD⁺ or NADP⁺ as acceptor

1.12.1.1 created 1965, deleted 1972

1.12.1.2 hydrogen dehydrogenase

1.12.1.3 hydrogen dehydrogenase (NADP⁺)

1.12.1.4 hydrogenase (NAD⁺, ferredoxin)

1.12.1.5 hydrogen dehydrogenase [NAD(P)⁺]

1.12.2 With a cytochrome as acceptor

1.12.5 With a quinone or similar compound as acceptor

1.12.7 With an iron-sulfur protein as acceptor

1.12.98 With other, known, physiological acceptors

1.12.99 With unknown physiological acceptors

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)

1.99.1 Hydroxylases (now covered by EC 1.14)

1.99.1.1 created 1961, deleted 1965

1.99.1.2 created 1961, deleted 1965

1.99.1.3 created 1961, deleted 1965

1.99.1.4 created 1961, deleted 1965

1.99.1.5 created 1961, deleted 1965

1.99.1.6 created 1961, deleted 1965

1.99.1.7 created 1961, deleted 1965

1.99.1.8 created 1961, deleted 1965

1.99.1.9 created 1961, deleted 1965

1.99.1.10 created 1961, deleted 1965

1.99.1.11 created 1961, deleted 1965

1.99.1.12 created 1961, deleted 1965

1.99.1.13 created 1961, deleted 1965

1.99.1.14 created 1961, deleted 1965

1.99.2 Oxygenases (now covered by EC 1.13)

2.1 Transferring one-carbon groups

2.2 Transferring aldehyde or ketonic groups

2.3 Acyltransferases

2.4 Glycosyltransferases

2.5 Transferring alkyl or aryl groups, other than methyl groups

2.6 Transferring nitrogenous groups

2.7 Transferring phosphorus-containing groups

2.8 Transferring sulfur-containing groups

2.9 Transferring selenium-containing groups

2.10 Transferring molybdenum- or tungsten-containing groups

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Release 2023.1 (January 2023)