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- W2113753742 abstract "The hydrolysis of p-nitrophenyl acetate (NPA) was catalyzed by copoly (L-Cys, L-Glu 1: 1). The pH-activity curve was bell-shaped with two optima of pH 6.1 at 40°C and pH7.1 at 40°C, unlike with other copolymers which gave one peak as shown previously. The catalytic action of copoly (L-Cys, L-Glu 1: 1) was compared with that of a mixture of poly-L-Glu and poly-L-Cys with components in the same proportions as in the copolymer. The activity of the copolymer at pH6.1 (40°C) was about 20 fold higher than that of poly-L-Glu at the optimum pH of 5.2. At pH7.1 (40°C), the activity was 1.5 fold higher than that of poly-L-Cys at the optimum pH of 7.8. The mechanisms of catalytic hydrolysis at the two optima seem to be different; the former seems to involve cooperation between SH and COO−, and the latter bifunctional catalysis between SH and OH−. Copoly (L-Cys, L-Asp) and sequential poly-L-cysteinyl-L-glutamic acid had no activity. A method was devised for preparation of a sample solution of cysteinyl copolymer free from activator for measurement of NPA hydrolysis." @default.
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- W2113753742 date "1971-09-01" @default.
- W2113753742 modified "2023-09-25" @default.
- W2113753742 title "Studies on the Catalytic Action of Poly-α-Amino Acids: VI.* Hydrolysis of p-Nitrophenyl Acetate by an Interaction between Sulfhydryl and Carboxyl Groups in Copoly (L-Cys, L-Glu)**" @default.
- W2113753742 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a129661" @default.
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