期刊
ENZYME AND MICROBIAL TECHNOLOGY
卷 152, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2021.109923
关键词
Endoplasmic reticulum; Trichoderma reesei; Cellulase; Secretory pathway
资金
- National Natural Science Foundation of China [31970070]
- National Key R&D Program of China [2018YFA0900500, 2021YFC2101300]
- Youth Interdisciplinary Science and Innovative Research Groups of Shandong University [2020QNQT006]
Through engineering the endoplasmic reticulum (ER) secretory pathway, the secretion of cellulolytic enzymes can be significantly increased, and the resistance to ER stress can also be regulated, thereby enhancing cellulase production.
The filamentous fungus Trichoderma reesei is an extraordinarily efficient cell factory of industrial cellulase for production of biofuels and other bio-based products because of its excellent potential to secrete cellulolytic enzymes. Engineering the protein secretory pathway may be a powerful means for efficient protein production. However, it is uncertain whether this engineering approach could improve cellulase production in T. reesei. Herein, the endoplasmic reticulum (ER) secretory pathway was engineered for the production of cellulolytic enzymes by multiple strategies, including: (I) overexpression of the key components of protein folding (Pdi1, Ero1 and BiP); (II) overexpression of the glycosylation-related elements (Gpt1 and Gls2); (III) knockout of the ER mannosidase I (Mns1) encoding gene mns1. By utilizing these ER engineering strategies, the secretion of beta-glucosidase was remarkably elevated in the engineered strains, ranging from 29.2 % to 112.5 %. Furthermore, it was found that engineering these components also regulated the ER stress resistance. More importantly, the total cellulase production was increased with varying degrees, which reached a maximum of 149.4 %, using the filter paper assay (FPA) as a characterization method. These results demonstrated that engineering the ER secretory pathway can enhance protein secretion, particularly for cellulase production, which shed light for the development of high-efficient cellulolytic enzymes for economically feasible bioethanol production from ligno-cellulosic biomass.
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