1. Oxidoreductases

 2. Transferases

   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

     2.7.1  Phosphotransferases with an alcohol group as acceptor

     2.7.2  Phosphotransferases with a carboxy 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

       2.7.11.1  non-specific serine/threonine protein kinase

       2.7.11.2  [pyruvate dehydrogenase (acetyl-transferring)] kinase

       2.7.11.3  dephospho-[reductase kinase] kinase

       2.7.11.4  [3-methyl-2-oxobutanoate dehydrogenase (acetyl-transferring)] kinase

       2.7.11.5  [isocitrate dehydrogenase (NADP+)] kinase

       2.7.11.6  [tyrosine 3-monooxygenase] kinase

       2.7.11.7  myosin-heavy-chain kinase

       2.7.11.8  Fas-activated serine/threonine kinase

       2.7.11.9  Goodpasture-antigen-binding protein kinase

       2.7.11.10  IkappaB kinase

       2.7.11.11  cAMP-dependent protein kinase

       2.7.11.12  cGMP-dependent protein kinase

       2.7.11.13  protein kinase C

       2.7.11.14  rhodopsin kinase

       2.7.11.15  beta-adrenergic-receptor kinase

       2.7.11.16  G-protein-coupled receptor kinase

       2.7.11.17  Ca2+/calmodulin-dependent protein kinase

       2.7.11.18  myosin-light-chain kinase

       2.7.11.19  phosphorylase kinase

       2.7.11.20  elongation factor 2 kinase

       2.7.11.21  polo kinase

       2.7.11.22  cyclin-dependent kinase

       2.7.11.23  [RNA-polymerase]-subunit kinase

       2.7.11.24  mitogen-activated protein kinase

       2.7.11.25  mitogen-activated protein kinase kinase kinase

       2.7.11.26  tau-protein kinase

       2.7.11.28  tropomyosin kinase

       2.7.11.29  low-density-lipoprotein receptor kinase

       2.7.11.30  receptor protein serine/threonine kinase

       2.7.11.31  [hydroxymethylglutaryl-CoA reductase (NADPH)] kinase

       2.7.11.32  [pyruvate, phosphate dikinase] kinase

       2.7.11.33  [pyruvate, water dikinase] kinase

       2.7.11.34  NEK6-subfamily protein kinase

       2.7.11.35  CRIK-subfamily protein kinase

       2.7.11.36  MASTL-subfamily protein kinase

       2.7.11.37  MAST-subfamily protein kinase

     2.7.12  Dual-specificity kinases (those acting on Ser/Thr and Tyr residues)

     2.7.13  Protein-histidine kinases

     2.7.14  Protein-arginine kinases

     2.7.99  Other protein kinases

   2.8  Transferring sulfur-containing groups

   2.9  Transferring selenium-containing groups

   2.10  Transferring molybdenum- or tungsten-containing groups

 3. Hydrolases

 4. Lyases

 5. Isomerases

 6. Ligases

 7. Translocases