Table 1.

Enzyme classes, types of reactions and corresponding enzymes

S. no.	Class	Reactions	Enzymes
1	Oxidoreductases	Transfer of hydrogen or oxygen or electrons between molecules	Dehydrogenases, oxidases, oxygenases, peroxidases
2	Transferases	Transfer of groups of atoms from one molecule to another	Fructosyltransferases, transketolases, acyltransferases, transaminases
3	Hydrolases	Hydrolytic cleavage of bonds	Proteases, amylases, acylases, lipases, phosphatases, cutinases
4	Lyases	Non-hydrolytic cleavage by elimination or addition reactions	Pectate lyases, hydratases, dehydratases, decarboxylases, fumarase, argino succinase
5	Isomerases	Transfer of group from one position to another within one molecule	Isomerases, epimerases, racemases
6	Ligases	Covalent joining of two molecules coupled with the hydrolysis of an energy rich bond in ATP or similar triphosphates	Synthetases, ligases