Improvement in catalytic activity and thermostability of a GH10 xylanase and its synergistic degradation of biomass with cellulase

文献类型： 外文期刊

第一作者： You, Shuai

作者： You, Shuai;Ma, Rui;Huang, Huo-qing;Su, Xiao-yun;Cai, Hui-yi;Yao, Bin;Luo, Hui-ying;You, Shuai;Xie, Chen;Herman, Richard Ansah;Ge, Yan;Wang, Jun;You, Shuai;Xie, Chen;Herman, Richard Ansah;Ge, Yan;Wang, Jun

作者机构：

关键词： GH10 xylanase; Catalytic efficiency; Thermostability; Fragment replacement; Biomass degradation

期刊名称：BIOTECHNOLOGY FOR BIOFUELS （ 影响因子：6.04； 五年影响因子：6.485 ）

ISSN：

年卷期： 2019 年 12 卷 1 期

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收录情况： SCI

摘要： Background: Xylanase is one of the most extensively used biocatalysts for biomass degradation. However, its low catalytic efficiency and poor thermostability limit its applications. Therefore, improving the properties of xylanases to enable synergistic degradation of lignocellulosic biomass with cellulase is of considerable significance in the field of bioenergy. Results: Using fragment replacement, we improved the catalytic performance and thermostability of a GH10 xylanase, XylE. Of the ten hybrid enzymes obtained, seven showed xylanase activity. Substitution of fragments, M3, M6, M9, and their combinations enhanced the catalytic efficiency (by 2.4- to fourfold) as well as the specific activity (by 1.2- to 3.3-fold) of XylE. The hybrids, XylE-M3, XylE-M3/M6, XylE-M3/M9, and XylE-M3/M6/M9, showed enhanced thermostability, as observed by the increase in the T-50 (3-4.7 degrees C) and T-m (1.1-4.7 degrees C), and extended t(1/2) (by 1.8-2.3 h). In addition, the synergistic effect of the mutant xylanase and cellulase on the degradation of mulberry bark showed that treatment with both XylE-M3/M6 and cellulase exhibited the highest synergistic effect. In this case, the degree of synergy reached 1.3, and the reducing sugar production and dry matter reduction increased by 148% and 185%, respectively, compared to treatment with only cellulase. Conclusions: This study provides a successful strategy to improve the catalytic properties and thermostability of enzymes. We identified several xylanase candidates for applications in bioenergy and biorefinery. Synergistic degradation experiments elucidated a possible mechanism of cellulase inhibition by xylan and xylo-oligomers.

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