1. Oxidoreductases

 2. Transferases

 3. Hydrolases

 4. Lyases

 5. Isomerases

   5.1  Racemases and epimerases

   5.2  cis-trans-Isomerases

   5.3  Intramolecular oxidoreductases

   5.4  Intramolecular transferases

     5.4.1  Transferring acyl groups

     5.4.2  Phosphotransferases (phosphomutases)

     5.4.3  Transferring amino groups

       5.4.3.2  lysine 2,3-aminomutase

       5.4.3.3  lysine 5,6-aminomutase

       5.4.3.5  D-ornithine 4,5-aminomutase

       5.4.3.6  tyrosine 2,3-aminomutase

       5.4.3.7  leucine 2,3-aminomutase

       5.4.3.8  glutamate-1-semialdehyde 2,1-aminomutase

       5.4.3.9  glutamate 2,3-aminomutase

       5.4.3.10  phenylalanine aminomutase (L-beta-phenylalanine forming)

       5.4.3.11  phenylalanine aminomutase (D-beta-phenylalanine forming)

     5.4.4  Transferring hydroxy groups

     5.4.99  Transferring other groups

   5.5  Intramolecular lyases

   5.6  Isomerases altering macromolecular conformation

   5.99  Other isomerases

 6. Ligases

 7. Translocases