Chymotrypsin-catalysed transpeptidations

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Abstract
The action of chymotrypsin on tyrosine amide, phenylalanine amide, tyrosyltyrosine amide, phenylalanylphenylaline amide, tyrosyl-phenylalanine amide, phenylalanyltyrosine amide and tyrosyltyrosine was studied. Hydrolysis is accompanied by transpeptidation in the case of tyrosine amide, phenylalanine amide and tyrosyltyrosine. The products thus formed then break down to give the amino acids as final products. The action of pepsin, papain, and ficin on some of these substrates is also described briefly.