1. Oxidoreductases

 2. Transferases

   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

       2.4.2.12  nicotinamide phosphoribosyltransferase

       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

       2.4.2.24  1,4-beta-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-beta-D-xylosyltransferase

       2.4.2.39  xyloglucan 6-xylosyltransferase

       2.4.2.40  zeatin O-beta-D-xylosyltransferase

       2.4.2.41  xylogalacturonan beta-1,3-xylosyltransferase

       2.4.2.42  UDP-D-xylose:beta-D-glucoside alpha-1,3-D-xylosyltransferase

       2.4.2.43  lipid IVA 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  beta-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  alpha-dystroglycan beta1,4-xylosyltransferase

       2.4.2.62  xylosyl alpha-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

   2.6  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

 3. Hydrolases

   3.1  Acting on ester bonds

   3.2  Glycosylases

     3.2.1  Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds

     3.2.2  Hydrolysing N-glycosyl compounds

       3.2.2.1  purine nucleosidase

       3.2.2.2  inosine nucleosidase

       3.2.2.3  uridine nucleosidase

       3.2.2.4  AMP nucleosidase

       3.2.2.5  NAD+ glycohydrolase

       3.2.2.6  ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase

       3.2.2.7  adenosine nucleosidase

       3.2.2.8  ribosylpyrimidine nucleosidase

       3.2.2.9  adenosylhomocysteine nucleosidase

       3.2.2.10  pyrimidine-5'-nucleotide nucleosidase

       3.2.2.11  beta-aspartyl-N-acetylglucosaminidase

       3.2.2.12  inosinate nucleosidase

       3.2.2.13  1-methyladenosine nucleosidase

       3.2.2.14  NMN nucleosidase

       3.2.2.15  DNA-deoxyinosine glycosylase

       3.2.2.16  methylthioadenosine nucleosidase

       3.2.2.17  deoxyribodipyrimidine endonucleosidase

       3.2.2.19  [protein ADP-ribosylarginine] hydrolase

       3.2.2.20  DNA-3-methyladenine glycosylase I

       3.2.2.21  DNA-3-methyladenine glycosylase II

       3.2.2.22  rRNA N-glycosylase

       3.2.2.23  DNA-formamidopyrimidine glycosylase

       3.2.2.24  ADP-ribosyl-[dinitrogen reductase] hydrolase

       3.2.2.25  N-methyl nucleosidase

       3.2.2.26  futalosine hydrolase

       3.2.2.27  uracil-DNA glycosylase

       3.2.2.28  double-stranded uracil-DNA glycosylase

       3.2.2.29  thymine-DNA glycosylase

       3.2.2.30  aminodeoxyfutalosine nucleosidase

       3.2.2.31  adenine glycosylase

   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

   3.9  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

 4. Lyases

 5. Isomerases

 6. Ligases

 7. Translocases