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EC Tree

1 Oxidoreductases

2.1 Transferring one-carbon groups

2.2 Transferring aldehyde or ketonic groups

2.3 Acyltransferases

2.4 Glycosyltransferases

2.4.1 Hexosyltransferases

2.4.2 Pentosyltransferases

2.4.2.1 purine-nucleoside phosphorylase

2.4.2.2 pyrimidine-nucleoside phosphorylase

2.4.2.3 uridine phosphorylase

2.4.2.4 thymidine phosphorylase

2.4.2.5 nucleoside ribosyltransferase

2.4.2.6 nucleoside deoxyribosyltransferase

2.4.2.7 adenine phosphoribosyltransferase

2.4.2.8 hypoxanthine phosphoribosyltransferase

2.4.2.9 uracil phosphoribosyltransferase

2.4.2.10 orotate phosphoribosyltransferase

2.4.2.11 nicotinate phosphoribosyltransferase

2.4.2.12 nicotinamide phosphoribosyltransferase

2.4.2.13 created 1961, deleted 1965

2.4.2.14 amidophosphoribosyltransferase

2.4.2.15 guanosine phosphorylase

2.4.2.16 urate-ribonucleoside phosphorylase

2.4.2.17 ATP phosphoribosyltransferase

2.4.2.18 anthranilate phosphoribosyltransferase

2.4.2.19 nicotinate-nucleotide diphosphorylase (carboxylating)

2.4.2.20 dioxotetrahydropyrimidine phosphoribosyltransferase

2.4.2.21 nicotinate-nucleotide—dimethylbenzimidazole phosphoribosyltransferase

2.4.2.22 xanthine phosphoribosyltransferase

2.4.2.23 deoxyuridine phosphorylase

2.4.2.24 1,4-β-D-xylan synthase

2.4.2.25 flavone apiosyltransferase

2.4.2.26 protein xylosyltransferase

2.4.2.27 dTDP-dihydrostreptose—streptidine-6-phosphate dihydrostreptosyltransferase

2.4.2.28 S-methyl-5′-thioadenosine phosphorylase

2.4.2.29 tRNA-guanosine³⁴ preQ₁ transglycosylase

2.4.2.30 NAD⁺ ADP-ribosyltransferase

2.4.2.31 NAD⁺—protein-arginine ADP-ribosyltransferase

2.4.2.32 dolichyl-phosphate D-xylosyltransferase

2.4.2.33 dolichyl-xylosyl-phosphate—protein xylosyltransferase

2.4.2.34 indolylacetylinositol arabinosyltransferase

2.4.2.35 flavonol-3-O-glycoside xylosyltransferase

2.4.2.36 NAD⁺—diphthamide ADP-ribosyltransferase

2.4.2.37 NAD⁺—dinitrogen-reductase ADP-D-ribosyltransferase

2.4.2.38 glycoprotein 2-β-D-xylosyltransferase

2.4.2.39 xyloglucan 6-xylosyltransferase

2.4.2.40 zeatin O-β-D-xylosyltransferase

2.4.2.41 xylogalacturonan β-1,3-xylosyltransferase

2.4.2.42 UDP-D-xylose:β-D-glucoside α-1,3-D-xylosyltransferase

2.4.2.43 lipid IV_A 4-amino-4-deoxy-L-arabinosyltransferase

2.4.2.44 S-methyl-5′-thioinosine phosphorylase

2.4.2.45 decaprenyl-phosphate phosphoribosyltransferase

2.4.2.46 galactan 5-O-arabinofuranosyltransferase

2.4.2.47 arabinofuranan 3-O-arabinosyltransferase

2.4.2.48 tRNA-guanine¹⁵ transglycosylase

2.4.2.49 neamine phosphoribosyltransferase

2.4.2.50 cyanidin 3-O-galactoside 2′′-O-xylosyltransferase

2.4.2.51 anthocyanidin 3-O-glucoside 2′′′-O-xylosyltransferase

2.4.2.52 triphosphoribosyl-dephospho-CoA synthase

2.4.2.53 undecaprenyl-phosphate 4-deoxy-4-formamido-L-arabinose transferase

2.4.2.54 β-ribofuranosylphenol 5′-phosphate synthase

2.4.2.55 nicotinate D-ribonucleotide:phenol phospho-D-ribosyltransferase

2.4.2.56 kaempferol 3-O-xylosyltransferase

2.4.2.57 AMP phosphorylase

2.4.2.58 hydroxyproline O-arabinosyltransferase

2.4.2.59 sulfide-dependent adenosine diphosphate thiazole synthase

2.4.2.60 cysteine-dependent adenosine diphosphate thiazole synthase

2.4.2.61 α-dystroglycan β1,4-xylosyltransferase

2.4.2.62 xylosyl α-1,3-xylosyltransferase

2.4.2.63 EGF-domain serine xylosyltransferase

2.4.2.64 tRNA-guanosine³⁴ queuine transglycosylase

2.4.3 Sialyltransferases

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 (only sub-subclass identified to date)

2.6 Transferring nitrogenous groups

2.6.1 Transaminases

2.6.2 Amidinotransferases (deleted sub-subclass)

2.6.2.1 created 1961, deleted 1965

2.6.3 Oximinotransferases

2.6.99 Transferring other 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

2.10.1 Molybdenumtransferases or tungstentransferases with sulfide groups as acceptors

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Release 2023.1 (January 2023)