Table 1. Classification of enzymatic reactions and related information.
| Reaction Type | Schematic | Enzymatic class | Number of (redundant) structures | Number of unique reactions |
|---|---|---|---|---|
| Redox reactions |  |
Oxidoreductases (EC 1.) | 12581 | 2143 |
| Single replacement/transfer |  |
Transferases (EC 2.) | 23020 | 2045 |
| Double replacement/transfer (acid-base reactions) |  |
Hydrolases (EC 3.) | 26942 | 1797 |
| Decomposition (bond breaking) |  |
Lyases (EC 4.) | 5307 | 771 |
| Isomerization (bond rearrangement) |  |
Isomerases (EC 5.) | 2985 | 306 |
| Synthesis (bond formation) |  |
Ligases (EC 6.) | 2024 | 228 |