Template:ECHierarchy

(Original source: http://au.expasy.org/enzyme/enzyme-byclass.html)

EC Class 1: Oxidoreductases

• 1.-.-.- Oxidoreductases.
• 1.1.-.- Acting on the CH-OH group of donors.
• 1.1.1.- With NAD(+) or NADP(+) as acceptor.
• 1.1.2.- With a cytochrome as acceptor.
• 1.1.3.- With oxygen as acceptor.
• 1.1.4.- With a disulfide as acceptor.
• 1.1.5.- With a quinone or similar compound as acceptor.
• 1.1.99.- With other acceptors.
• 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.
• 1.2.7.- With an iron-sulfur protein as acceptor.
• 1.2.99.- With other acceptors.
• 1.3.-.- Acting on the CH-CH group of donors.
• 1.3.1.- With NAD(+) or NADP(+) as acceptor.
• 1.3.2.- With a cytochrome as acceptor.
• 1.3.3.- With oxygen as acceptor.
• 1.3.5.- With a quinone or related compound as acceptor.
• 1.3.7.- With an iron-sulfur protein as acceptor.
• 1.3.99.- With other acceptors.
• 1.4.-.- Acting on the CH-NH(2) group of donors.
• 1.4.1.- With NAD(+) or NADP(+) as acceptor.
• 1.4.2.- With a cytochrome as acceptor.
• 1.4.3.- With oxygen as acceptor.
• 1.4.4.- With a disulfide as acceptor.
• 1.4.7.- With an iron-sulfur protein as acceptor.
• 1.4.99.- With other acceptors.
• 1.5.-.- Acting on the CH-NH group of donors.
• 1.5.1.- With NAD(+) or NADP(+) as acceptor.
• 1.5.3.- With oxygen as acceptor.
• 1.5.4.- With a disulfide as acceptor.
• 1.5.5.- With a quinone or similar compound as acceptor.
• 1.5.7.- With an iron-sulfur protein as acceptor.
• 1.5.8.- With a flavin as acceptor.
• 1.5.99.- With other acceptors.
• 1.6.-.- Acting on NADH or NADPH.
• 1.6.1.- With NAD(+) or NADP(+) as acceptor.
• 1.6.2.- With a heme protein as acceptor.
• 1.6.3.- With a oxygen as acceptor.
• 1.6.5.- With a quinone or similar compound as acceptor.
• 1.6.6.- With a nitrogenous group as acceptor.
• 1.6.99.- With other acceptors.
• 1.7.-.- Acting on other nitrogenous compounds as donors.
• 1.7.1.- With NAD(+) or NADP(+) as acceptor.
• 1.7.2.- With a cytochrome as acceptor.
• 1.7.3.- With oxygen as acceptor.
• 1.7.7.- With an iron-sulfur protein as acceptor.
• 1.7.99.- With other acceptors.
• 1.8.-.- Acting on a sulfur group of donors.
• 1.8.1.- With NAD(+) or NADP(+) as acceptor.
• 1.8.2.- With a cytochrome as acceptor.
• 1.8.3.- With oxygen as acceptor.
• 1.8.4.- With a disulfide as acceptor.
• 1.8.5.- With a quinone or similar compound as acceptor.
• 1.8.7.- With an iron-sulfur protein as acceptor.
• 1.8.98.- With other, known, acceptors.
• 1.8.99.- With other acceptors.
• 1.9.-.- Acting on a heme group of donors.
• 1.9.3.- With oxygen as acceptor.
• 1.9.6.- With a nitrogenous group as acceptor.
• 1.9.99.- With other acceptors.
• 1.10.-.- Acting on diphenols and related substances as donors.
• 1.10.1.- With NAD(+) or NADP(+) as acceptor.
• 1.10.2.- With a cytochrome as acceptor.
• 1.10.3.- With oxygen as acceptor.
• 1.10.99.- With other acceptors.
• 1.11.-.- Acting on a peroxide as acceptor.
• 1.11.1.- Peroxidases.
• 1.12.-.- Acting on hydrogen as donor.
• 1.12.1.- With NAD(+) or NADP(+) as acceptor.
• 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 acceptors.
• 1.12.99.- With other acceptors.
• 1.13.-.- Acting on single donors with incorporation of molecular oxygen.
• 1.13.11.- With incorporation of two atoms of oxygen.
• 1.13.12.- With incorporation of one atom of oxygen.
• 1.13.99.- Miscellaneous (requires further characterization).
• 1.14.-.- Acting on paired donors, with incorporation or reduction of
• 1.14.11.- With 2-oxoglutarate as one donor, and incorporation of one
• 1.14.12.- With NADH or NADPH as one donor, and incorporation of two
• 1.14.13.- With NADH or NADPH as one donor, and incorporation of one atom
• 1.14.14.- With reduced flavin or flavoprotein as one donor, and
• 1.14.15.- With a reduced iron-sulfur protein as one donor, and
• 1.14.16.- With reduced pteridine as one donor, and incorporation of one
• 1.14.17.- With reduced ascorbate as one donor, and incorporation of one
• 1.14.18.- With another compound as one donor, and incorporation of one
• 1.14.19.- With oxidation of a pair of donors resulting in the reduction
• 1.14.20.- With 2-oxoglutarate as one donor, and the other dehydrogenated.
• 1.14.21.- With NADH or NADPH as one donor, and the other dehydrogenated.
• 1.14.99.- Miscellaneous (requires further characterization).
• 1.15.-.- Acting on superoxide as acceptor.
• 1.15.1.- Acting on superoxide as acceptor.
• 1.16.-.- Oxidizing metal ions.
• 1.16.1.- With NAD(+) or NADP(+) as acceptor.
• 1.16.3.- With oxygen as acceptor.
• 1.16.8.- With flavin as acceptor.
• 1.17.-.- Acting on CH or CH(2) groups.
• 1.17.1.- With NAD(+) or NADP(+) 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.
• 1.17.99.- With other acceptors.
• 1.18.-.- Acting on iron-sulfur proteins as donors.
• 1.18.1.- With NAD(+) or NADP(+) as acceptor.
• 1.18.6.- With dinitrogen as acceptor.
• 1.19.-.- Acting on reduced flavodoxin as donor.
• 1.19.6.- With dinitrogen as acceptor.
• 1.20.-.- Acting on phosphorus or arsenic in donors.
• 1.20.1.- Acting on phosphorus or arsenic in donors, with NAD(P)(+) as
• 1.20.4.- Acting on phosphorus or arsenic in donors, with disulfide as
• 1.20.98.- Acting on phosphorus or arsenic in donors, with other, known
• 1.20.99.- Acting on phosphorus or arsenic in donors, with other
• 1.21.-.- Acting on x-H and y-H to form an x-y bond.
• 1.21.3.- With oxygen as acceptor.
• 1.21.4.- With a disulfide as acceptor.
• 1.21.99.- With other acceptors.
• 1.97.-.- Other oxidoreductases.
• 1.97.1.- Sole sub-subclass for oxidoreductases that do not belong in the other.

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EC Class 2: Transferases

• 2.-.-.- Transferases.
• 2.1.-.- Transferring one-carbon groups.
• 2.1.1.- Methyltransferases.
• 2.1.2.- Hydroxymethyl-, formyl- and related transferases.
• 2.1.3.- Carboxyl- and carbamoyltransferases.
• 2.1.4.- Amidinotransferases.
• 2.2.-.- Transferring aldehyde or ketone residues.
• 2.2.1.- Transketolases and transaldolases.
• 2.3.-.- Acyltransferases.
• 2.3.1.- Transferring groups other than amino-acyl groups.
• 2.3.2.- Aminoacyltransferases.
• 2.3.3.- Acyl groups converted into alkyl on transfer.
• 2.4.-.- Glycosyltransferases.
• 2.4.1.- Hexosyltransferases.
• 2.4.2.- Pentosyltransferases.
• 2.4.99.- Transferring other glycosyl groups.
• 2.5.-.- Transferring alkyl or aryl groups, other than methyl groups.
• 2.5.1.- Transferring alkyl or aryl groups, other than methyl groups.
• 2.6.-.- Transferring nitrogenous groups.
• 2.6.1.- Transaminases (aminotransferases).
• 2.6.3.- Oximinotransferases.
• 2.6.99.- Transferring other nitrogenous groups.
• 2.7.-.- Transferring phosphorous-containing groups.
• 2.7.1.- Phosphotransferases with an alcohol group as acceptor.
• 2.7.2.- Phosphotransferases with a carboxyl group as acceptor.
• 2.7.3.- Phosphotransferases with a nitrogenous group as acceptor.
• 2.7.4.- Phosphotransferases with a phosphate group as acceptor.
• 2.7.6.- Diphosphotransferases.
• 2.7.7.- Nucleotidyltransferases.
• 2.7.8.- Transferases for other substituted phosphate groups.
• 2.7.9.- Phosphotransferases with paired acceptors.
• 2.7.10.- Protein-tyrosine kinases.
• 2.7.11.- Protein-serine/threonine kinases.
• 2.7.12.- Dual-specificity kinases (those acting on Ser/Thr and Tyr
• 2.7.13.- Protein-histidine kinases.
• 2.7.99.- Other protein kinases.
• 2.8.-.- Transferring sulfur-containing groups.
• 2.8.1.- Sulfurtransferases.
• 2.8.2.- Sulfotransferases.
• 2.8.3.- CoA-transferases.
• 2.8.4.- Transferring alkylthio groups.
• 2.9.-.- Transferring selenium-containing groups.
• 2.9.1.- Selenotransferases.

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EC Class 3: Hydrolases

• 3.-.-.- Hydrolases.
• 3.1.-.- Acting on ester bonds.
• 3.1.1.- Carboxylic ester hydrolases.
• 3.1.2.- Thiolester hydrolases.
• 3.1.3.- Phosphoric monoester hydrolases.
• 3.1.4.- Phosphoric diester hydrolases.
• 3.1.5.- Triphosphoric monoester hydrolases.
• 3.1.6.- Sulfuric ester hydrolases.
• 3.1.7.- Diphosphoric monoester hydrolases.
• 3.1.8.- Phosphoric triester hydrolases.
• 3.1.11.- Exodeoxyribonucleases producing 5'-phosphomonoesters.
• 3.1.13.- Exoribonucleases producing 5'-phosphomonoesters.
• 3.1.14.- Exoribonucleases producing 3'-phosphomonoesters.
• 3.1.15.- Exonucleases active with either ribo- or deoxyribonucleic acid
• 3.1.16.- Exonucleases active with either ribo- or deoxyribonucleic acid
• 3.1.21.- Endodeoxyribonucleases producing 5'-phosphomonoesters.
• 3.1.22.- Endodeoxyribonucleases producing other than 5'-phosphomonoesters.
• 3.1.25.- Site-specific endodeoxyribonucleases specific for altered bases.
• 3.1.26.- Endoribonucleases producing 5'-phosphomonoesters.
• 3.1.27.- Endoribonucleases producing other than 5'-phosphomonoesters.
• 3.1.30.- Endoribonucleases active with either ribo- or deoxyribonucleic
• 3.1.31.- Endoribonucleases active with either ribo- or deoxyribonucleic
• 3.2.-.- Glycosylases.
• 3.2.1.- Glycosidases, i.e.enzymes hydrolyzing O- and S-glycosyl
• 3.2.2.- Hydrolyzing N-glycosyl compounds.
• 3.3.-.- Acting on ether bonds.
• 3.3.1.- Thioether and trialkylsulfonium hydrolases.
• 3.3.2.- Ether hydrolases.
• 3.4.-.- Acting on peptide bonds (peptide hydrolases).
• 3.4.11.- Aminopeptidases.
• 3.4.13.- Dipeptidases.
• 3.4.14.- Dipeptidyl-peptidases and tripeptidyl-peptidases.
• 3.4.15.- Peptidyl-dipeptidases.
• 3.4.16.- Serine-type carboxypeptidases.
• 3.4.17.- Metallocarboxypeptidases.
• 3.4.18.- Cysteine-type carboxypeptidases.
• 3.4.19.- Omega peptidases.
• 3.4.21.- Serine endopeptidases.
• 3.4.22.- Cysteine endopeptidases.
• 3.4.23.- Aspartic endopeptidases.
• 3.4.24.- Metalloendopeptidases.
• 3.4.25.- Threonine endopeptidases.
• 3.4.99.- Endopeptidases of unknown catalytic mechanism.
• 3.5.-.- Acting on carbon-nitrogen bonds, other than peptide bonds.
• 3.5.1.- In linear amides.
• 3.5.2.- In cyclic amides.
• 3.5.3.- In linear amidines.
• 3.5.4.- In cyclic amidines.
• 3.5.5.- In nitriles.
• 3.5.99.- In other compounds.
• 3.6.-.- Acting on acid anhydrides.
• 3.6.1.- In phosphorous-containing anhydrides.
• 3.6.2.- In sulfonyl-containing anhydrides.
• 3.6.3.- Acting on acid anhydrides; catalyzing transmembrane movement
• 3.6.4.- Acting on acid anhydrides; involved in cellular and
• 3.6.5.- Acting on GTP; involved in cellular and subcellular movement.
• 3.7.-.- Acting on carbon-carbon bonds.
• 3.7.1.- In ketonic substances.
• 3.8.-.- Acting on halide bonds.
• 3.8.1.- In C-halide compounds.
• 3.9.-.- Acting on phosphorus-nitrogen bonds.
• 3.9.1.- Acting on phosphorus-nitrogen bonds.
• 3.10.-.- Acting on sulfur-nitrogen bonds.
• 3.10.1.- Acting on sulfur-nitrogen bonds.
• 3.11.-.- Acting on carbon-phosphorus bonds.
• 3.11.1.- Acting on carbon-phosphorus bonds.
• 3.12.-.- Acting on sulfur-sulfur bonds.
• 3.12.1.- Acting on sulfur-sulfur bonds.
• 3.13.-.- Acting on carbon-sulfur bonds.
• 3.13.1.- Acting on carbon-sulfur bonds.

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EC Class 4: Lyases

• 4.-.-.- Lyases.
• 4.1.-.- Carbon-carbon lyases.
• 4.1.1.- Carboxy-lyases.
• 4.1.2.- Aldehyde-lyases.
• 4.1.3.- Oxo-acid-lyases.
• 4.1.99.- Other carbon-carbon lyases.
• 4.2.-.- Carbon-oxygen lyases.
• 4.2.1.- Hydro-lyases.
• 4.2.2.- Acting on polysaccharides.
• 4.2.3.- Acting on phosphates.
• 4.2.99.- Other carbon-oxygen lyases.
• 4.3.-.- Carbon-nitrogen lyases.
• 4.3.1.- Ammonia-lyases.
• 4.3.2.- Lyases acting on amides, amidines, etc.
• 4.3.3.- Amine-lyases.
• 4.4.-.- Carbon-sulfur lyases.
• 4.4.1.- Carbon-sulfur lyases.
• 4.5.-.- Carbon-halide lyases.
• 4.5.1.- Carbon-halide lyases.
• 4.6.-.- Phosphorus-oxygen lyases.
• 4.6.1.- Phosphorus-oxygen lyases.
• 4.99.-.- Other lyases.
• 4.99.1.- Sole sub-subclass for lyases that do not belong in the other.

EC Class 5: Isomerases

• 5.-.-.- Isomerases.
• 5.1.-.- Racemases and epimerases.
• 5.1.1.- Acting on amino acids and derivatives.
• 5.1.2.- Acting on hydroxy acids and derivatives.
• 5.1.3.- Acting on carbohydrates and derivatives.
• 5.1.99.- Acting on other compounds.
• 5.2.-.- Cis-trans-isomerases.
• 5.2.1.- Cis-trans Isomerases.
• 5.3.-.- Intramolecular oxidoreductases.
• 5.3.1.- Interconverting aldoses and ketoses.
• 5.3.2.- Interconverting keto- and enol- groups.
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• 5.3.4.- Transposing S-S bonds.
• 5.3.99.- Other intramolecular oxidoreductases.
• 5.4.-.- Intramolecular transferases (mutases).
• 5.4.1.- Transferring acyl groups.
• 5.4.2.- Phosphotransferases (phosphomutases).
• 5.4.3.- Transferring amino groups.
• 5.4.4.- Transferring hydroxy groups.
• 5.4.99.- Transferring other groups.
• 5.5.-.- Intramolecular lyases.
• 5.5.1.- Intramolecular lyases.
• 5.99.-.- Other isomerases.
• 5.99.1.- Sole sub-subclass for isomerases that do not belong in the other.

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EC Class 6: Ligases

• 6.-.-.- Ligases.
• 6.1.-.- Forming carbon-oxygen bonds.
• 6.1.1.- Ligases forming aminoacyl-tRNA and related compounds.
• 6.2.-.- Forming carbon-sulfur bonds.
• 6.2.1.- Acid--thiol ligases.
• 6.3.-.- Forming carbon-nitrogen bonds.
• 6.3.1.- Acid--ammonia (or amide) ligases (amide synthases).
• 6.3.2.- Acid--D-amino-acid ligases (peptide synthases).
• 6.3.3.- Cyclo-ligases.
• 6.3.4.- Other carbon--nitrogen ligases.
• 6.3.5.- Carbon--nitrogen ligases with glutamine as amido-N-donor.
• 6.4.-.- Forming carbon-carbon bonds.
• 6.4.1.- Ligases that form carbon-carbon bonds.
• 6.5.-.- Forming phosphoric ester bonds.
• 6.5.1.- Ligases that form phosphoric-ester bonds.
• 6.6.-.- Forming nitrogen-metal bonds.
• 6.6.1.- Forming coordination complexes.

Upper Levels: EC : EC : EC