日常农业工业废物,主要是纤维素,木质素,和半纤维素,带来了重大的环境挑战。利用木质纤维素分解酶,特别是内切-1,4-β-木聚糖酶,有效的糖化是一种具有成本效益的策略,将生物质转化为高价值产品。这项研究的重点是克隆,表达式,定点诱变,净化,三维建模,和大肠杆菌中棒曲霉的重组内切-1,4-β-木聚糖酶(XlnA)的表征。这项工作包括在不同的NaCl浓度下的稳定性评估,确定动力学常数,并使用pET22b(+)呈递XlnAΔ36的异源表达。该表达导致纯化的酶在不同的pH水平上具有强大的稳定性,在50°C时具有优异的热稳定性,在3.0MNaCl中24小时后的相对稳定性为96-100%。三维建模揭示了具有催化残基Glu132和22的GH11结构。与其他内切-1,4-β-木聚糖酶相比,XlnAΔ36表现出出色的动力学参数,表明了它在工业酶鸡尾酒中的潜力,增强糖化。此外,它产生高价值化合物的能力,比如糖,为食品和生物技术行业提供了一种有希望且对生态有利的替代方案。
Daily agro-industrial waste, primarily cellulose, lignin, and hemicellulose, poses a significant environmental challenge. Harnessing lignocellulolytic enzymes, particularly endo-1,4-β-xylanases, for efficient saccharification is a cost-effective strategy, transforming biomass into high-value products. This study focuses on the cloning, expression, site-directed mutagenesis, purification, three-dimensional modeling, and characterization of the recombinant endo-1,4-β-xylanase (XlnA) from Aspergillus clavatus in Escherichia coli. This work includes evaluation of the stability at varied NaCl concentrations, determining kinetic constants, and presenting the heterologous expression of XlnAΔ36 using pET22b(+). The expression led to purified enzymes with robust stability across diverse pH levels, exceptional thermostability at 50 °C, and 96-100% relative stability after 24 h in 3.0 M NaCl. Three-dimensional modeling reveals a GH11 architecture with catalytic residues Glu 132 and 22. XlnAΔ36 demonstrates outstanding kinetic parameters compared to other endo-1,4-β-xylanases, indicating its potential for industrial enzymatic cocktails, enhancing saccharification. Moreover, its ability to yield high-value compounds, such as sugars, suggests a promising and ecologically positive alternative for the food and biotechnology industries.