1. Oxidoreductases

 2. Transferases

 3. Hydrolases

   3.1  Acting on ester bonds

   3.2  Glycosylases

   3.3  Acting on ether bonds

     3.3.2  Ether hydrolases

       3.3.2.1  isochorismatase

       3.3.2.2  lysoplasmalogenase

       3.3.2.4  trans-epoxysuccinate hydrolase

       3.3.2.6  leukotriene-A4 hydrolase

       3.3.2.7  hepoxilin-epoxide hydrolase

       3.3.2.8  limonene-1,2-epoxide hydrolase

       3.3.2.9  microsomal epoxide hydrolase

       3.3.2.10  soluble epoxide hydrolase

       3.3.2.11  cholesterol-5,6-oxide hydrolase

       3.3.2.12  oxepin-CoA hydrolase

       3.3.2.13  chorismatase

       3.3.2.14  2,4-dinitroanisole O-demethylase

       3.3.2.15  trans-2,3-dihydro-3-hydroxyanthranilic acid synthase

   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