Table 8.8: Six major classes of enzymes

Class

Type of reaction

Example

Chapter

1. Oxidoreductases

Oxidation–reduction

Lactate dehydrogenase

16

2. Transferases

Group transfer

Nucleoside monophosphate kinase (NMP kinase)

  9

3. Hydrolases

Hydrolysis reactions (transfer of functional groups to water)

Chymotrypsin

  9

4. Lyases

Addition or removal of groups to form double bonds

Fumarase

17

5. Isomerases

Isomerization (intramolecular group transfer)

Triose phosphate isomerase

16

6. Ligases

Ligation of two substrates at the expense of ATP hydrolysis

Aminoacyl-tRNA synthetase

30