International classification of enzymes No. Class Type of reaction catalyzed 1 Oxidoreductase Transfer of electrons 2 Transferase Group transfer reaction 3 Hydrolase Hydrolysis reaction 4 Lyase Addition of groups to double bonds,or formation of double bonds by removal of groups 5 Isomerase Transfer of groups within molecules to yield isomeric forms 6 Ligase Bond formation coupled with ATP hydrolysis Serine endopeptidase: Chymotrypsin EC3.4.21.1 Trypsin EC3.4.21.4 Subtilisin EC3.4.21.62 14 14 No. Class Type of reaction catalyzed 1 Oxidoreductase Transfer of electrons 2 Transferase Group transfer reaction 3 Hydrolase Hydrolysis reaction 4 Lyase Addition of groups to double bonds, or formation of double bonds by removal of groups 5 Isomerase Transfer of groups within molecules to yield isomeric forms 6 Ligase Bond formation coupled with ATP hydrolysis International classification of enzymes Serine endopeptidase: Chymotrypsin Trypsin Subtilisin …… EC 3.4.21.1 EC 3.4.21.4 EC 3.4.21.62