Abstract
The kinetics of oxidation of 4-hydroxybiphenyl (4-HBP) catalyzed by laccase from Polyporus pinsitus was studied in the presence of methyl syringate (MS), which acts as an electron-transfer mediator. Measurements were performed in 0.05 M acetate buffer, pH 5.5, in the presence of 4-HBP, MS, and laccase. It is shown that the oxidation rate of the lowly reactive substrate 4-HBP significantly increases during synergistic action of the highly reactive substrate MS. Bimolecular kinetic constants of interaction between the oxidized form of laccase and MS, the former and 4-HBP, and the oxidized form of MS and 4-HBP were calculated. A kinetic scheme of the synergistic substrate action is suggested; based on this scheme, the dependence of the initial rate on reagent concentration is derived. Analyzing experimental data, we obtained kinetic constants close to those obtained by modeling the processes.
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Abbreviations
- 4-HBP:
-
4-hydroxybiphenyl
- MS:
-
methyl syringate
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Original Russian Text © I. Bratkovskaya, R. Ivanec, J. Kulys, 2006, published in Biokhimiya, 2006, Vol. 71, No. 5, pp. 681–686.
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Bratkovskaya, I., Ivanec, R. & Kulys, J. Mediator-assisted laccase-catalyzed oxidation of 4-hydroxybiphenyl. Biochemistry (Moscow) 71, 550–554 (2006). https://doi.org/10.1134/S0006297906050130
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DOI: https://doi.org/10.1134/S0006297906050130