Abstract
Leavening ability in sweet dough is required for the commercial applications of baker’s yeast. This property depends on many factors, such as glycolytic activity, sucrase activity, and osmotolerance. This study explored the importance of sucrase level on the leavening ability of baker’s yeast in sweet dough. Furthermore, the baker’s yeast strains with varying sucrase activities were constructed by deleting SUC2, which encodes sucrase or replacing the SUC2 promoter with the VPS8/TEF1 promoter. The results verify that the sucrase activity negatively affects the leavening ability of baker’s yeast strains under high-sucrose conditions. Based on a certain level of osmotolerance, sucrase level plays a significant role in the fermentation performance of baker’s yeast, and appropriate sucrase activity is an important determinant for the leavening property of baker’s yeast in sweet dough. Therefore, modification on sucrase activity is an effective method for improving the leavening properties of baker’s yeast in sweet dough. This finding provides guidance for the breeding of industrial baker’s yeast strains for sweet dough leavening. The transformants BS1 with deleted SUC2 genetic background provided decreased sucrase activity (a decrease of 39.3 %) and exhibited enhanced leavening property (an increase of 12.4 %). Such a strain could be useful for industrial applications.
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Acknowledgments
The current study was financially supported by the National Natural Science Foundation of China (31571809) and the National High Technology Research and Development Program of China (2013AA102106).
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Cui-Ying Zhang and Xue Lin are the co-first authors in this study.
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Zhang, CY., Lin, X., Feng, B. et al. Enhanced leavening properties of baker’s yeast by reducing sucrase activity in sweet dough. Appl Microbiol Biotechnol 100, 6375–6383 (2016). https://doi.org/10.1007/s00253-016-7449-0
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DOI: https://doi.org/10.1007/s00253-016-7449-0