Journal
BIORESOURCE TECHNOLOGY
Volume 355, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127244
Keywords
Agricultural residues; Bifunctional xylanase/feruloyl esterase; Domain truncation; Lignocellulose hydrolysis
Funding
- National Natural Science Foundation of China [31870784, 31972042]
- Liaoning Xingliao Yingcai Science and Technology Innovation Talent Plan [2018-35]
- Natural Science Foundation of Liaoning Province [2020-MS-318]
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The xylanase and feruloyl esterase domains of the bifunctional enzyme Xyn-Fae were identified, and a more efficient bifunctional enzyme XynII-Fae was constructed. The synergistic action of XynII-Fae with cellulase dramatically improved the hydrolysis efficiency of lignocellulose.
Herein, the xylanase and feruloyl esterase domains of the xylanase/feruloyl esterase bifunctional enzyme (Xyn-Fae) from Prevotella ruminicola 23 were identified using N- and C-terminal truncation mutagenesis. In addition, a novel and more efficient xylanase/feruloyl esterase bifunctional enzyme XynII-Fae was constructed, and its synergistic action with a commercial cellulase for lignocellulose hydrolysis was studied. When 40% cellulase was replaced by XynII-Fae, the production of reducing sugars increased by 65% than that with the cellulase alone, and the conversions of xylan and glucan were increased by 125.1% and 54.3%, respectively. When 80% cellulase was substituted by XynII-Fae, up to 43.5 mu g/mL ferulic acid and 418.7 mu g/mL acetic acid were obtained. The XynII-Fae could also accelerate the hydrolysis of wheat straw and sugarcane bagasse with commercial cellulase. These results indicated that the synergistic action of XynII-Fae with cellulase could dramatically improve the hydrolysis efficiency of lignocellulose, showing the great potential for industrial applications.
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