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10:08
Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
Published on: August 12, 2019
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Elevated temperatures do not trigger a conserved metabolic network response among thermotolerant yeasts
Mathias Lehnen1, Birgitta E Ebert2, Lars M Blank1
1iAMB - Institute of Applied Microbiology, ABBt - Aachen Biology and Biotechnology, RWTH Aachen University, Worringer Weg 1, D-52074, Aachen, Germany.
BMC Microbiology
|May 19, 2019
Summary
Thermotolerance in yeast is crucial for industrial applications. This study reveals distinct metabolic responses to heat stress in Kluyveromyces marxianus and Ogataea polymorpha, offering insights for optimizing microbial cell factories.
Area of Science:
- Microbiology
- Biotechnology
- Metabolic Engineering
Background:
- Thermotolerance is a key trait for microbial cell factories, but yeast typically have a narrow temperature range.
- Only a few yeast species, like Kluyveromyces marxianus and Ogataea polymorpha, grow well above 40°C.
- Understanding yeast thermotolerance mechanisms is challenging due to limited physiological and metabolic data at high temperatures.
Purpose of the Study:
- To investigate the metabolic network response of yeast to elevated fermentation temperatures (up to 49°C).
- To compare thermotolerance mechanisms between different yeast species, specifically Kluyveromyces and Ogataea.
- To generate comprehensive physiological datasets for metabolic flux analyses at high temperatures.
Main Methods:
- Generation of comprehensive physiological datasets for multiple Kluyveromyces and Ogataea strains.
- Application of 13C-metabolic flux analysis to study metabolic network responses.
- Cultivation of yeast strains at temperatures up to 49°C.
Main Results:
- Maximum growth temperatures were similar across investigated yeast strains.
- Metabolic network responses to elevated temperatures varied significantly between species.
- Ogataea polymorpha showed minimal metabolic flux changes with increasing temperature, while Kluyveromyces marxianus exhibited extensive flux rerouting.
Conclusions:
- While a complete thermotolerance mechanism is not fully elucidated from fluxome data alone.
- The generated data serves as a valuable resource for engineering yeast metabolic activity using temperature modulation.
- Distinct metabolic strategies for thermotolerance were observed between K. marxianus and O. polymorpha.
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