Abstract

Polyethylene glycol-modified thermolysin was found to efficiently catalyze peptide synthesis in organic solvents. As in aqueous media, the reaction occurred through a rapid equilibrium random bireactant mechanism. However, the substrate specificity of modified thermolysin was actually changed since hydrophilic as well as acidic amino acids were better carboxyl group donors than hydrophobic residues, contrary to what is observed in both the enzyme-catalyzed synthesis and hydrolysis of peptide bonds in water.

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