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)

     3.4.11  Aminopeptidases

     3.4.13  Dipeptidases

     3.4.14  Dipeptidyl-peptidases and tripeptidyl-peptidases

       3.4.14.1  dipeptidyl-peptidase I

       3.4.14.2  dipeptidyl-peptidase II

       3.4.14.4  dipeptidyl-peptidase III

       3.4.14.5  dipeptidyl-peptidase IV

       3.4.14.6  dipeptidyl-dipeptidase

       3.4.14.9  tripeptidyl-peptidase I

       3.4.14.10  tripeptidyl-peptidase II

       3.4.14.11  Xaa-Pro dipeptidyl-peptidase

       3.4.14.12  Xaa-Xaa-Pro tripeptidyl-peptidase

       3.4.14.13  gamma-D-glutamyl-L-lysine dipeptidyl-peptidase

       3.4.14.14  [mycofactocin precursor peptide] peptidase

     3.4.15  Peptidyl-dipeptidases

     3.4.16  Serine-type carboxypeptidases

     3.4.17  Metallocarboxypeptidases

     3.4.18  Cysteine-type carboxypeptidases

     3.4.19  Omega peptidases

     3.4.21  Serine endopeptidases

     3.4.22  Cysteine endopeptidases

     3.4.23  Aspartic endopeptidases

     3.4.24  Metalloendopeptidases

     3.4.25  Threonine endopeptidases

     3.4.26  Glutamic endopeptidases

   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