Abstract
The conventional baker’s yeast, Saccharomyces cerevisiae, is the indispensable baking yeast of all times. Its monopoly coupled to its major drawbacks, such as streamlined carbon substrate utilisation base and a poor ability to withstand a number of baking associated stresses, prompt the need to search for alternative yeasts to leaven bread in the era of increasingly complex consumer lifestyles. Our previous work identified the inefficient baking attributes of Wickerhamomyces subpelliculosus and Kazachstania gamospora as well as preliminarily observations of improving the fermentative capacity of these potential alternative baker’s yeasts using evolutionary engineering. Here we report on the characterisation and improvement in baking traits in five out of six independently evolved lines incubated for longer time and passaged for at least 60 passages relative to their parental strains as well as the conventional baker’s yeast. In addition, the evolved clones produced bread with a higher loaf volume when compared to bread baked with either the ancestral strain or the control conventional baker’s yeast. Remarkably, our approach improved the yeasts’ ability to withstand baking associated stresses, a key baking trait exhibited poorly in both the conventional baker’s yeast and their ancestral strains. W. subpelliculosus evolved the best characteristics attractive for alternative baker’s yeasts as compared to the evolved K. gamospora strains. These results demonstrate the robustness of evolutionary engineering in development of alternative baker’s yeasts.
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This work was funded by the Department of Research and Innovation, Undergraduate Funding, Botswana University of Science and Technology (BIUST).
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TS performed the experiments. NZ conceived the experiments and partly designed the experiments. TS, TB, AG and NZ wrote the paper.
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Semumu, T., Gamero, A., Boekhout, T. et al. Evolutionary engineering to improve Wickerhamomyces subpelliculosus and Kazachstania gamospora for baking. World J Microbiol Biotechnol 38, 48 (2022). https://doi.org/10.1007/s11274-021-03226-9
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DOI: https://doi.org/10.1007/s11274-021-03226-9