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

     2.4.3  Sialyltransferases

     2.4.99  Transferring other glycosyl groups

       2.4.99.12  lipid IVA 3-deoxy-D-manno-octulosonic acid transferase

       2.4.99.13  (Kdo)-lipid IVA 3-deoxy-D-manno-octulosonic acid transferase

       2.4.99.14  (Kdo)2-lipid IVA (2-8) 3-deoxy-D-manno-octulosonic acid transferase

       2.4.99.15  (Kdo)3-lipid IVA (2-4) 3-deoxy-D-manno-octulosonic acid transferase

       2.4.99.16  starch synthase (maltosyl-transferring)

       2.4.99.17  S-adenosylmethionine:tRNA ribosyltransferase-isomerase

       2.4.99.18  dolichyl-diphosphooligosaccharide---protein glycotransferase

       2.4.99.19  undecaprenyl-diphosphooligosaccharide---protein glycotransferase

       2.4.99.20  2'-phospho-ADP-ribosyl cyclase/2'-phospho-cyclic-ADP-ribose transferase

       2.4.99.21  dolichyl-phosphooligosaccharide-protein glycotransferase

       2.4.99.23  lipopolysaccharide heptosyltransferase I

       2.4.99.24  lipopolysaccharide heptosyltransferase II

       2.4.99.25  lipopolysaccharide heptosyltransferase III

       2.4.99.26  O-antigen ligase

       2.4.99.27  O-antigen polymerase Wzy

       2.4.99.28  peptidoglycan glycosyltransferase

   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

 4. Lyases

 5. Isomerases

 6. Ligases

 7. Translocases