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

     3.4.15  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

       3.4.24.1  atrolysin A

       3.4.24.3  microbial collagenase

       3.4.24.6  leucolysin

       3.4.24.7  interstitial collagenase

       3.4.24.11  neprilysin

       3.4.24.12  envelysin

       3.4.24.13  IgA-specific metalloendopeptidase

       3.4.24.14  procollagen N-endopeptidase

       3.4.24.15  thimet oligopeptidase

       3.4.24.16  neurolysin

       3.4.24.17  stromelysin 1

       3.4.24.18  meprin A

       3.4.24.19  procollagen C-endopeptidase

       3.4.24.20  peptidyl-Lys metalloendopeptidase

       3.4.24.21  astacin

       3.4.24.22  stromelysin 2

       3.4.24.23  matrilysin

       3.4.24.24  gelatinase A

       3.4.24.25  vibriolysin

       3.4.24.26  pseudolysin

       3.4.24.27  thermolysin

       3.4.24.28  bacillolysin

       3.4.24.29  aureolysin

       3.4.24.30  coccolysin

       3.4.24.31  mycolysin

       3.4.24.32  beta-lytic metalloendopeptidase

       3.4.24.33  peptidyl-Asp metalloendopeptidase

       3.4.24.34  neutrophil collagenase

       3.4.24.35  gelatinase B

       3.4.24.36  leishmanolysin

       3.4.24.37  saccharolysin

       3.4.24.38  gametolysin

       3.4.24.39  deuterolysin

       3.4.24.40  serralysin

       3.4.24.41  atrolysin B

       3.4.24.42  atrolysin C

       3.4.24.43  atroxase

       3.4.24.44  atrolysin E

       3.4.24.45  atrolysin F

       3.4.24.46  adamalysin

       3.4.24.47  horrilysin

       3.4.24.48  ruberlysin

       3.4.24.49  bothropasin

       3.4.24.50  bothrolysin

       3.4.24.51  ophiolysin

       3.4.24.52  trimerelysin I

       3.4.24.53  trimerelysin II

       3.4.24.54  mucrolysin

       3.4.24.55  pitrilysin

       3.4.24.56  insulysin

       3.4.24.57  O-sialoglycoprotein endopeptidase

       3.4.24.58  russellysin

       3.4.24.59  mitochondrial intermediate peptidase

       3.4.24.60  dactylysin

       3.4.24.61  nardilysin

       3.4.24.62  magnolysin

       3.4.24.63  meprin B

       3.4.24.64  mitochondrial processing peptidase

       3.4.24.65  macrophage elastase

       3.4.24.66  choriolysin L

       3.4.24.67  choriolysin H

       3.4.24.68  tentoxilysin

       3.4.24.69  bontoxilysin

       3.4.24.70  oligopeptidase A

       3.4.24.71  endothelin-converting enzyme 1

       3.4.24.72  fibrolase

       3.4.24.73  jararhagin

       3.4.24.74  fragilysin

       3.4.24.75  lysostaphin

       3.4.24.76  flavastacin

       3.4.24.77  snapalysin

       3.4.24.78  gpr endopeptidase

       3.4.24.79  pappalysin-1

       3.4.24.80  membrane-type matrix metalloproteinase-1

       3.4.24.81  ADAM10 endopeptidase

       3.4.24.82  ADAMTS-4 endopeptidase

       3.4.24.83  anthrax lethal factor endopeptidase

       3.4.24.84  Ste24 endopeptidase

       3.4.24.85  S2P endopeptidase

       3.4.24.86  ADAM 17 endopeptidase

       3.4.24.87  ADAMTS13 endopeptidase

       3.4.24.89  Pro-Pro endopeptidase

     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