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This page lists enzymes by their classification in the International Union of Biochemistry and Molecular Biology's Enzyme Commission [EC] numbering system. For a list of the EC numbers themselves, see:


Category:Oxidoreductases (EC 1) (Oxidoreductase)Edit

Category:EC 1.1 (act on the CH-OH group of donors)Edit

Category:EC 1.2 (act on the aldehyde or oxo group of donors)Edit

Category:EC 1.3 (act on the CH-CH group of donors)Edit

Category:EC 1.4 (act on the CH-NH2 group of donors)Edit

Category:EC 1.5 (act on CH-NH group of donors)Edit

Category:EC 1.6 (act on NADH or NADPH)Edit

Category:EC 1.7 (act on other nitrogenous compounds as donors)Edit

Category:EC 1.8 (act on a sulfur group of donors)Edit

Category:EC 1.9 (act on a heme group of donors)Edit

Category:EC 1.10 (act on diphenols and related substances as donors)Edit

Category:EC 1.11 (act on peroxide as an acceptor -- peroxidases)Edit

Category:EC 1.12 (act on hydrogen as a donor)Edit

Category:EC 1.13 (act on single donors with incorporation of molecular oxygen)Edit

Category:EC 1.14 (act on paired donors with incorporation of molecular oxygen)Edit

Category:EC 1.15 (act on superoxide radicals as acceptors)Edit

Category:EC 1.16 (oxidize metal ions)Edit

Category:EC 1.17 (act on CH or CH2 groups)Edit

Category:EC 1.18 (act on iron-sulfur proteins as donors)Edit

Category:EC 1.19 (act on reduced flavodoxin as donor)Edit

Category:EC 1.20 (act on phosphorus or arsenic as donors)Edit

Category:EC 1.21 (act on X-H and Y-H to form an X-Y bond)Edit

Category:EC 1.97 (other oxidoreductases)Edit

Category:Transferases (EC 2) (Transferase)Edit

Category:EC 2.1 (transfer one-carbon groups, Methylase)Edit

Category:EC 2.2 (transfer aldehyde or ketone groups)Edit

Category:EC 2.3 (acyltransferases)Edit

Category:EC 2.4 (glycosyltransferases)Edit

Category:EC 2.5

Category:EC 2.5 (transfer alkyl or aryl groups, other than methyl groups)Edit

Category:EC 2.6 (transfer nitrogenous groups)Edit

Category:EC 2.7 (transfer phosphorus-containing groups)Edit

Category:EC 2.8 (transfer sulfur-containing groups)Edit

Category:EC 2.9 (transfer selenium-containing groups)Edit

Category:Hydrolases (EC 3) (Hydrolase)Edit

Category:EC 3.1 (act on ester bonds)Edit

Category:EC 3.2 (act on sugars - glycosylases)Edit

Category:EC 3.3 (act on ether bonds)Edit

Category:EC 3.4 (act on peptide bonds - Peptidase)Edit

Category:EC 3.5 (act on carbon-nitrogen bonds, other than peptide bonds)Edit

Category:EC 3.6 (act on acid anhydrides)Edit

Category:EC 3.7 (act on carbon-carbon bonds)Edit

Category:EC 3.8 (act on halide bonds)Edit

Category:EC 3.9 (act on phosphorus-nitrogen bonds)Edit

Category:EC 3.10 (act on sulfur-nitrogen bonds)Edit

Category:EC 3.11 (act on carbon-phosphorus bonds)Edit

Category:EC 3.12 (act on sulfur-sulfur bonds)Edit

Category:EC 3.13 (act on carbon-sulfur bonds)Edit

Category:Lyases (EC 4) (Lyase)Edit

Category:Isomerases (EC 5) (Isomerase)Edit

Category:EC 5.1 (racemases and epimerases)Edit

Category:EC 5.2 (cis-trans-isomerases)Edit

Category:EC 5.3 (intramolecular oxidoreductases)Edit

Category:EC 5.4 (intramolecular transferases -- mutases)Edit

Category:EC 5.5 (intramolecular lyases)Edit

Intramolecular lyases:
EC number Examples
EC Muconate cycloisomerase
EC 3-carboxy-cis,cis-muconate cycloisomerase
EC Tetrahydroxypteridine cycloisomerase
EC Inositol-3-phosphate synthase
EC Carboxy-cis,cis-muconate cyclase
EC Chalcone isomerase
EC Chloromuconate cycloisomerase
EC (+)-bornyl diphosphate synthase
EC Cycloeucalenol cycloisomerase
EC Alpha-pinene-oxide decyclase
EC Dichloromuconate cycloisomerase
EC Copalyl diphosphate synthase
EC Ent-copalyl diphosphate synthase
EC Syn-copalyl-diphosphate synthase
EC Terpentedienyl-diphosphate synthase
EC Halimadienyl-diphosphate synthase
EC (S)-beta-macrocarpene synthase
EC Lycopene epsilon-cyclase
EC Lycopene beta-cyclase
EC Prosolanapyrone-III cycloisomerase
EC 5.5.1.n1 D-ribose pyranase
EC Steroid Delta Isomerase

Category:EC 5.99 (other isomerases)Edit

Category:Ligases (EC 6) (Ligase)Edit

Category:EC 6.1 (form carbon-oxygen bonds)Edit

6-carboxytetrahydropterin synthase

Category:EC 6.2 (form carbon-sulfur bonds)Edit

Category:EC 6.3 (form carbon-nitrogen bonds)Edit

Category:EC 6.4 (form carbon-carbon bonds)Edit

Category:EC 6.5 (form phosphoric ester bonds)Edit

DNA ligase (EC

Category:EC 6.6 (form nitrogen-metal bonds)Edit