Simultaneous identification of reaction and inactivation kinetics of an enzyme‐catalyzed carboligation
Simultaneous identification of reaction and inactivation kinetics of an enzyme‐catalyzed carboligation
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同时鉴定酶催化碳化反应的反应和失活动力学
DOI:
10.1002/btpr.2656
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发表时间:
2018
影响因子:
2.9
通讯作者:
Spiess AC
中科院分区:
文献类型:
--
作者:
Leipnitz M. Schöpping M;Spiess AC
Thiamine diphosphate (ThDP)‐dependent enzymes catalyze a broad range of reactions with excellent enantioselectivity. Among these reactions, carboligations of aldehydes are of particular interest since the products, chiral hydroxy ketones, are valuable building blocks in the pharmaceutical industry. However, the substrates, for example, benzaldehyde, inactivate the biocatalysts, for example the ThDP‐dependent benzaldehyde lyase fromPseudomonas fluorescens(PfBAL). Because only few mechanistic kinetic models for carboligation and simultaneous inactivation are available today, we quantitatively determined the reaction kinetics and inactivation of the self‐carboligation of benzaldehyde yielding the product (R)‐benzoin catalyzed byPfBAL directly from progress curves using model‐based experimental analysis. Discrimination of several inactivation models identified the substrate‐dependent inactivation by benzaldehyde to be significant. Sensitivity analysis and optimal experimental design improved parameter precision significantly, to between 4 and 26% relative standard deviation while maintaining the necessary number of 13 experiments moderate. The developed mechanistic kinetic model will enable to perform a model‐based process optimization to circumvent the substrate‐dependent enzyme inactivation. © 2018 American Institute of Chemical EngineersBiotechnol. Prog., 2018 © 2018 American Institute of Chemical EngineersBiotechnol. Prog., 34:1081–1092, 2018
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