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Abstract
Two series of inverse substrates, p- and m-(amidinomethyl)phenyl esters derived from N-(tert-butyloxycarbonyl)amino acid, were prepared as acyl donor components for enzymatic peptide synthesis. They were found to be readily coupled with an acyl acceptor such as L-alanine p-nitroanilide to produce dipeptide. An alpha-aminoisobutyric acid containing dipeptide was especially obtained in satisfactory yield. Streptomyces griseus trypsin was a more efficient catalyst than the bovine trypsin. The optimum condition for the coupling reaction was studied by changing the organic solvent, pH, and acyl acceptor concentration. It was found that the enzymatic hydrolysis of the resulting product was negligible.
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