Physiological and transcriptomic response of Saccharomyces pastorianus to cold storage

Somani, Abhishek; Box, Wendy G.; Smart, Katherine A.; Powell, Chris D.

Abstract

Removal of yeast biomass at the end of fermentation, followed by a period of storage before re-inoculation into a subsequent fermentation, is common in the brewing industry. Storage is typically conducted at cold temperatures to preserve yeast quality, a practice which has unfavourable cost and environmental implications. To determine the potential for alleviating these effects, the transcriptomic and physiological response of Saccharomyces pastorianus strain W34/70 to standard (4°C) and elevated (10°C) storage temperatures was explored. Higher temperatures resulted in increased expression of genes associated with the production and mobilisation of intracellular glycogen, trehalose, glycerol and fatty acids, although these observations were limited to early stages of storage. Intracellular trehalose and glycerol concentrations were higher at 4°C than at 10°C, as a consequence of the cellular response to cold stress. However, significant changes in glycogen degradation or cellular fatty acid composition did not occur between the two sets of populations, ensuring that cell viability remained consistent. It is anticipated that this data may lead to changes in standard practice for handling yeast cultures, without compromising yeast quality. This work has significance not only for the brewing industry, but also for food and biofuel sectors requiring short term storage of liquid yeast.

Citation

Somani, A., Box, W. G., Smart, K. A., & Powell, C. D. (2019). Physiological and transcriptomic response of Saccharomyces pastorianus to cold storage. FEMS Yeast Research, 19(4), Article foz025. https://doi.org/10.1093/femsyr/foz025

• Journal Article Type: Article
• Acceptance Date: Feb 18, 2019
• Online Publication Date: Mar 27, 2019
• Publication Date: 2019-06
• Deposit Date: Mar 28, 2019
• Publicly Available Date: Mar 28, 2020
• Journal: FEMS Yeast Research
• Print ISSN: 1567-1356
• Electronic ISSN: 1567-1364
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 19
• Issue: 4
• Article Number: foz025
• DOI: https://doi.org/10.1093/femsyr/foz025
• Keywords: Brewing, cold shock, lager yeast, membrane fluidity, repitching, yeast stress
• Public URL: https://nottingham-repository.worktribe.com/output/1696919
• Publisher URL: https://academic.oup.com/femsyr/advance-article/doi/10.1093/femsyr/foz025/5420514
• Additional Information: This is a pre-copyedited, author-produced version of an article accepted for publication in FEMS Yeast Research following peer review. The version of record is available online at: https://academic.oup.com/femsyr/advance-article/doi/10.1093/femsyr/foz025/5420514
• Contract Date: Mar 28, 2019