Journal
BIOMACROMOLECULES
Volume 3, Issue 2, Pages 318-323Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm010135c
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Protease-catalyzed polymerization and copolymerization Of L-glutamic acid diethyl ester hydrochloride (1) have been performed in a buffer of high concentration. Papain and bromelain showed high catalytic activity toward the polymerization. H-H COSY NMR analysis of the product showed the exclusive formation of poly(alpha-peptide), which was further confirmed by comparison with NMR spectra of poly(alpha-methyl gamma-L-glutamate). The papain-catalyzed polymerization of gamma-methyl L-glutamate did not occur under the similar reaction conditions, supporting the regioselective production of the polymer having an alpha-peptide linkage from 1. The effects of the reaction parameters have been systematically investigated. The copolymerization of 1 with various amino acid esters took place by the papain catalyst to give peptide copolymers.
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