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Biochemical characterization, structure-guided mutagenesis, and application of a recombinant D-allulose 3-epimerase from Christensenellaceae bacterium for the biocatalytic production of D-allulose

文献类型： 外文期刊

作者： Guan, Lijun 1 ; Zhu, Ling 1 ; Wang, Kunlun 1 ; Gao, Yang 1 ; Li, Jialei 1 ; Yan, Song 1 ; Zhang, Xindi 1 ; Ji, Nina 3 ; Fan, Jing 1 ; Zhou, Ye 1 ; Yao, Xinmiao 1 ; Li, Bo 1 ;

作者机构： 1.Heilongjiang Acad Sci, Inst Food Proc, Harbin, Peoples R China

2.Key Lab Food Proc Heilongjiang Prov, Harbin, Peoples R China

3.Heilongjiang Acad Agr Sci, Soybean Inst, Harbin, Peoples R China

关键词： D-allulose; D-allulose 3-epimerase; bioconversion; site-directed iteration mutagenesis; apple juice

期刊名称：FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY （ 影响因子：5.7； 五年影响因子：6.2 ）

ISSN： 2296-4185

年卷期： 2024 年 12 卷

页码：

收录情况： SCI

摘要： D-Allulose has become a promising alternative sweetener due to its unique properties of low caloric content, moderate sweetness, and physiological effects. D-Allulose 3-epimerase (DAEase) is a promising enzyme for D-Allulose production. However, the low catalytic efficiency limited its large-scale industrial applications. To obtain a more effective biocatalyst, a putative DAEase from Christensenellaceae bacterium (CbDAE) was identified and characterized. The recombinant CbDAE exhibited optimum activity at pH 7.5 degrees C and 55 degrees C, retaining more than 60% relative activity from 40 degrees C to 70 degrees C, and the catalytic activity could be significantly increased by Co2+ supplementation. These enzymatic properties of purified CbDAE were compared with other DAEases. CbDAE was also found to possess desirable thermal stability at 55 degrees C with a half-life of 12.4 h. CbDAE performed the highest relative activity towards D-allulose and strong affinity for D-fructose but relatively low catalytic efficiency towards D-fructose. Based on the structure-guided design, the best double-mutation variant G36N/W112E was obtained which reached up to 4.21-fold enhancement of catalytic activity compared with wild-type (WT) CbDAE. The catalytic production of G36N/W112E with 500 g/L D-fructose was at a medium to a higher level among the DAEases in 3.5 h, reducing 40% catalytic reaction time compared to the WT CbDAE. In addition, the G36N/W112E variant was also applied in honey and apple juice for D-allulose conversion. Our research offers an extra biocatalyst for D-allulose production, and the comprehensive report of this enzyme makes it potentially interesting for industrial applications and will aid the development of industrial biocatalysts for D-allulose.

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