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Increased yield of beta-glucosidase-catalyzed hydrolysis reactions in the presence of betaine-type metabolite analog

机译:在甜菜碱型代谢物类似物存在下,β-葡糖苷酶催化水解反应的产率提高

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摘要

beta-Glucosidases (EC 3.2.1.21), abundant enzymes distributed in animals, plants and microorganism, has been generating lots of attentions for bioethanol production from cellulosic biomass. In this study, using three different origins of beta-glucosidases, glucose productivity of beta-glucosidase-catalyzed hydrolysis reactions in the presence of synthetic betaine-type metabolite analog (2-N,N,N-tri-n-butylammonium) acetate, was investigated. By the addition of the analog, the hydrolysis yields for all beta-glucosidases was highly improved from 4-13 to 64-100 %. To understand the factors affecting on the yield enhancements, the kinetic parameters, inhibition constants of end-product and temporal stability of beta-glucosidases were compared. As a result, enhancement of the yields is mainly related to the increase in the temporal stability of beta-glucosidases in the presence of the analog. The present findings lead to not only improve the glucose productivity of beta-glucosidase-catalyzed hydrolysis reaction toward bioethanol production but also apply to a new stabilization method for various unstable enzymes.
机译:β-葡萄糖苷酶(EC 3.2.1.21)是分布在动植物,微生物中的丰富酶,已经引起了人们对纤维素生物质生产生物乙醇的广泛关注。在这项研究中,使用三种不同来源的β-葡萄糖苷酶,在合成甜菜碱型代谢物类似物(2-N,N,N-三-正丁基铵)乙酸盐存在下,β-葡萄糖苷酶催化的水解反应的葡萄糖生产率,被调查了。通过添加类似物,所有β-葡糖苷酶的水解产率都从4-13%提高到64-100%。为了了解影响产量提高的因素,比较了动力学参数,终产物抑制常数和β-葡萄糖苷酶的时间稳定性。结果,产率的提高主要与在类似物存在下β-葡糖苷酶的时间稳定性的增加有关。本发现不仅导致提高β-葡糖苷酶催化的水解反应对生物乙醇生产的葡萄糖生产率,而且还适用于各种不稳定酶的新稳定化方法。

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