Top Level Codes
| Group | Reaction catalyzed | Typical reaction | Enzyme example(s) with trivial name |
|---|---|---|---|
| EC 1 Oxidoreductases |
To catalyze oxidation/reduction reactions; transfer of H and O atoms or electrons from one substance to another | AH + B → A + BH A + O → AO |
Dehydrogenase, oxidase |
| EC 2 Transferases |
Transfer of a functional group from one substance to another. The group may be methyl-, acyl-, amino- or phosphate group | AB + C → A + BC | Transaminase, kinase |
| EC 3 Hydrolases |
Formation of two products from a substrate by hydrolysis | AB + H2O → AOH + BH | Lipase, amylase, peptidase |
| EC 4 Lyases |
Non-hydrolytic addition or removal of groups from substrates. C-C, C-N, C-O or C-S bonds may be cleaved | RCOCOOH → RCOH + CO2 or → | Decarboxylase |
| EC 5 Isomerases |
Intramolecule rearrangement, i.e. isomerization changes within a single molecule | AB → BA | Isomerase, mutase |
| EC 6 Ligases |
Join together two molecules by synthesis of new C-O, C-S, C-N or C-C bonds with simultaneous breakdown of ATP | X + Y+ ATP → XY + ADP + Pi | Synthetase |
Read more about this topic: Enzyme Commission Number
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