Site\|directed mutagenesis was used to investigate the effects of S221C/P225A,N118S/S221C/P225A,D60N/N118S/S221C/P225A and Q103R/N118S/S221C/P225A mutations on the properties of Subtilisin E.It was found that S221C/P225A mutant is 73 000\|fold decreased in amidase activity than subtilisin E and 3\|fold increased than subtiligase in the ratio of esterase/amidase;N118S/S221C/P225A mutant has 3\^6\|fold and 15\|fold decreased in amidase and esterase activity respectively and as a result,it has a 4\|fold lower ...