1. Oxidoreductases

 2. Transferases

 3. Hydrolases

   3.1  Acting on ester bonds

   3.2  Glycosylases

   3.3  Acting on ether bonds

   3.4  Acting on peptide bonds (peptidases)

   3.5  Acting on carbon-nitrogen bonds, other than peptide bonds

     3.5.1  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

       3.5.99.1  riboflavinase

       3.5.99.2  aminopyrimidine aminohydrolase

       3.5.99.5  2-aminomuconate deaminase

       3.5.99.6  glucosamine-6-phosphate deaminase

       3.5.99.7  1-aminocyclopropane-1-carboxylate deaminase

       3.5.99.8  5-nitroanthranilic acid aminohydrolase

       3.5.99.9  2-nitroimidazole nitrohydrolase

       3.5.99.10  2-iminobutanoate/2-iminopropanoate deaminase

       3.5.99.11  2-aminomuconate deaminase (2-hydroxymuconate-forming)

       3.5.99.12  salsolinol synthase

       3.5.99.13  strictosidine synthase

       3.5.99.14  (S)-norcoclaurine synthase

       3.5.99.15  deacetylisoipecoside synthase

       3.5.99.16  deacetylipecoside synthase

   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