1. Oxidoreductase reactions

   1.1  Acting on the CH-OH group of donors

   1.2  Acting on the aldehyde or oxo group of donors

   1.3  Acting on the CH-CH group of donors

     1.3.1  With NAD+ or NADP+ as acceptor

     1.3.2  With a cytochrome as acceptor

     1.3.3  With oxygen as acceptor

     1.3.4  With a disulfide as acceptor

     1.3.5  With a quinone or related compound as acceptor

       1.3.5.1

       1.3.5.2

       1.3.5.3

       1.3.5.5

       1.3.5.6

     1.3.7  With an iron-sulfur protein as acceptor

     1.3.8  With a flavin as acceptor

     1.3.98  With other, known, physiological acceptors

     1.3.99  With unknown physiological acceptors

     1.3.-  Acting on the CH-CH group of donors

   1.4  Acting on the CH-NH2 group of donors

   1.5  Acting on the CH-NH group of donors

   1.6  Acting on NADH or NADPH

   1.7  Acting on other nitrogenous compounds as donors

   1.8  Acting on a sulfur group of donors

   1.9  Acting on a heme group of donors

   1.10  Acting on diphenols and related substances as donors

     1.10.1  With NAD+ or NADP+ as acceptor

       1.10.1.1

     1.10.3  With oxygen as acceptor

       1.10.3.1

       1.10.3.3

       1.10.3.4

       1.10.3.5

       1.10.3.6

       1.10.3.9

       1.10.3.11

       1.10.3.15

       1.10.3.16

       1.10.3.-

   1.11  Acting on a peroxide as acceptor

   1.12  

   1.13  Acting on single donors with incorporation of molecular oxygen (oxygenases)

   1.14  Acting on paired donors, with incorporation or reduction of molecular oxygen

   1.16  Oxidizing metal ions

   1.17  Acting on CH or CH2 groups

   1.18  Acting on iron-sulfur proteins as donors

   1.19  Acting on reduced flavodoxin as donor

   1.20  Acting on phosphorus or arsenic in donors

   1.21  Catalysing the reaction X-H + Y-H = X-Y

   1.23  Reducing C-O-C group as acceptor

   1.97  Other oxidoreductases

   1.-  

 2. Transferase reactions

   2.1  Transferring one-carbon groups

     2.1.1  Methyltransferases

     2.1.2  Hydroxymethyl-, formyl- and related transferases

       2.1.2.1

       2.1.2.2

       2.1.2.3

       2.1.2.4

       2.1.2.5

       2.1.2.7

       2.1.2.8

       2.1.2.9

       2.1.2.10

       2.1.2.11

       2.1.2.13

       2.1.2.14

     2.1.3  Carboxy- and carbamoyltransferases

     2.1.4  Amidinotransferases

     2.1.5  Methylenetransferases

   2.2  Transferring aldehyde or ketonic groups

   2.3  Acyltransferases

   2.4  Glycosyltransferases

   2.5  Transferring alkyl or aryl groups, other than methyl groups

   2.6  Transferring nitrogenous groups

   2.7  Transferring phosphorus-containing groups

   2.8  Transferring sulfur-containing groups

   2.9  Transferring selenium-containing groups

   2.10  Transferring molybdenum- or tungsten-containing groups

   2.-  

 3. Hydrolase reactions

 4. Lyase reactions

 5. Isomerase reactions

   5.1  Racemases and epimerases

   5.2  cis-trans-Isomerases

   5.3  Intramolecular oxidoreductases

     5.3.1  Interconverting aldoses and ketoses, and related compounds

       5.3.1.1

       5.3.1.3

       5.3.1.4

       5.3.1.5

       5.3.1.6

       5.3.1.7

       5.3.1.8

       5.3.1.9

       5.3.1.12

       5.3.1.13

       5.3.1.14

       5.3.1.15

       5.3.1.16

       5.3.1.17

       5.3.1.20

       5.3.1.21

       5.3.1.22

       5.3.1.23

       5.3.1.24

       5.3.1.25

       5.3.1.26

       5.3.1.27

       5.3.1.28

       5.3.1.29

       5.3.1.30

       5.3.1.31

       5.3.1.32

       5.3.1.33

       5.3.1.34

       5.3.1.35

       5.3.1.37

       5.3.1.-

     5.3.2  Interconverting keto- and enol-groups

     5.3.3  Transposing C=C bonds

     5.3.99  Other intramolecular oxidoreductases

   5.4  Intramolecular transferases

   5.5  Intramolecular lyases

   5.99  Other isomerases

 6. Ligase reactions

   6.1  Forming carbon-oxygen bonds

     6.1.1  Ligases forming aminoacyl-tRNA and related compounds

       6.1.1.1

       6.1.1.2

       6.1.1.3

       6.1.1.4

       6.1.1.5

       6.1.1.6

       6.1.1.7

       6.1.1.9

       6.1.1.10

       6.1.1.11

       6.1.1.12

       6.1.1.13

       6.1.1.14

       6.1.1.15

       6.1.1.16

       6.1.1.17

       6.1.1.18

       6.1.1.19

       6.1.1.20

       6.1.1.21

       6.1.1.22

       6.1.1.23

       6.1.1.24

       6.1.1.26

       6.1.1.27

     6.1.2  acid-alcohol ligases (ester synthases)

   6.2  Forming carbon-sulfur bonds

   6.3  Forming carbon-nitrogen bonds

   6.4  Forming carbon-carbon bonds

   6.5  Forming phosphoric-ester bonds

   6.6  Forming nitrogen-metal bonds

 7. Translocase reactions