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Protein engineering of invertase for enhancing yeast dough fermentation under high-sucrose conditions

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Abstract

During yeast dough fermentation, such as the high-sucrose bread-making process, the yeast cells are subjected to considerable osmotic stress, resulting in poor outcomes. Invertase is important for catalyzing the irreversible hydrolysis of sucrose to free glucose and fructose, and decreasing the catalytic activity of the invertase may reduce the glucose osmotic stress on the yeast. In this study, we performed structural design and site-directed mutagenesis (SDM) on the Saccharomyces cerevisiae invertase (ScInV) in an Escherichia coli expression system to study the catalytic activity of ScInV mutants in vitro. In addition, we generated the same mutation sites in the yeast endogenous genome and tested their invertase activity in yeast and dough fermentation ability. Our results indicated that appropriately reduced invertase activity of yeast ScInV can enhance dough fermentation activity under high-sucrose conditions by 52%. Our systems have greatly accelerated the engineering of yeast endogenous enzymes both in vitro and in yeast, and shed light on future metabolic engineering of yeast.

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All data generated or analyzed during this study are included in this published article with supplementary information files.

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Acknowledgements

We thanked Xintong Huang and Zan Chen from College of Veterinary Medicine, China Agricultural University, for assistance in quantifying invertase activity of ScInV mutants in vitro.

Funding

This work was supported by the National Natural Science Foundation of China (21908004 and 32100156), the Fundamental Research Funds for the Central Universities (buctrc201801), the Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Chinese Universities Scientific Fund, Outstanding Talent Introduction Program from College of Veterinary Medicine, China Agricultural University, Beijing Zhongnongda Veterinary Hospital Co. Ltd., and Shandong Bio Sunkeen Co. Ltd.

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Contributions

LZ and ZYP supervised the study. ZYJ, MK, XS, LZ, and ZYP designed the experiments and analyzed the results. ZYJ and ZYP performed the experiments. MK, FJ, XS, and CG contributed reagents or analytical tools. ZY, MK, FJ, XS, CG, MD, JN, LZ, and ZYP all contributed to the overall study analysis, drafting, and reviewing of the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Zihe Liu or Yueping Zhang.

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The authors declare no competing interests.

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Highlights

• Appropriately reduced invertase activity of yeast ScInV point mutants (Q148A or Q201V) can improve dough fermentation activity under high-sucrose conditions.

• Our in vitro and in yeast site-directed mutagenesis systems can accelerate the engineering of yeast endogenous enzymes and could be a valuable tool to improve yeast characteristics.

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Supplementary file2 (XLSX 113 KB)

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Zhao, Y., Meng, K., Fu, J. et al. Protein engineering of invertase for enhancing yeast dough fermentation under high-sucrose conditions. Folia Microbiol 68, 207–217 (2023). https://doi.org/10.1007/s12223-022-01006-y

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