Abstract
Molecular and cellular processes that are responsible for industrially relevant phenotypes of fermenting microorganisms are a central focus of biotechnological research. Such research intends to generate insights and solutions for fermentation-based industries with regards to issues such as improving product yield or the quality of the final fermentation product. For logistical reasons, and to ensure data reproducibility, such research is mostly carried out in defined or synthetic media and in small-scale fermentation vessels. Two questions are frequently raised regarding the applicability of this approach to solve problems experienced in industrial fermentations: (1) Is synthetic medium a sufficiently accurate approximation of the generally more complex natural (and frequently highly variable) substrates that are employed in most fermentation-based industries, and (2) can results obtained in small-scale laboratory fermentations be extrapolated to large-scale industrial environments? Here, we address the second question through a comparative transcriptomic approach by assessing the response of an industrial wine yeast strain fermenting a natural grape juice in small-scale laboratory and large-scale industrial conditions. In yeast, transcriptome analysis is arguably the best available tool to holistically assess the physiological state of a population and its response to changing environmental conditions. The data suggest that scale does indeed impact on some environmental parameters such as oxygen availability. However, the data show that small-scale fermentations nevertheless accurately reflect general molecular processes and adaptations during large-scale fermentation and that extrapolation of laboratory datasets to real industrial processes can be justified.
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Acknowledgments
Funding for the research presented in this paper was provided by the NRF (National Research Foundation, South Africa) and Winetech. We would also like to thank Jo McBride and the Cape Town Centre for Proteomic and Genomic Research for the microarray analysis and the staff and students at the IWBT for their support and assistance in numerous areas. Large-scale fermentations were carried out at the Nietvoorbij Research Cellars in collaboration with the ARC (Agricultural Research Council).
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Rossouw, D., Jolly, N., Jacobson, D. et al. The effect of scale on gene expression: commercial versus laboratory wine fermentations. Appl Microbiol Biotechnol 93, 1207–1219 (2012). https://doi.org/10.1007/s00253-011-3564-0
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DOI: https://doi.org/10.1007/s00253-011-3564-0