How Oxygen Affects Yeast Metabolism
Author Information
Author(s): Paula Jouhten, Eija Rintala, Anne Huuskonen, Anu Tamminen, Mervi Toivari, Marilyn Wiebe, Laura Ruohonen, Merja Penttilä, Hannu Maaheimo
Primary Institution: VTT Technical Research Centre of Finland
Hypothesis
The study investigates how varying levels of oxygen influence the metabolic fluxes and energy generation in Saccharomyces cerevisiae.
Conclusion
The study found that different oxygen levels lead to significant changes in the metabolic pathways of yeast, affecting both respiration and fermentation processes.
Supporting Evidence
- Metabolic flux distributions were quantified using 13C-MFA under five different oxygenation conditions.
- Ethanol production was observed even at low oxygen levels, indicating a shift to fermentative metabolism.
- Respiratory ATP generation provided a significant portion of ATP demand even in low oxygen conditions.
Takeaway
Yeast can change how they make energy based on how much oxygen is around. With less oxygen, they switch from breathing to making alcohol.
Methodology
The study used 13C metabolic flux analysis (MFA) to quantify metabolic flux distributions under different oxygen conditions in glucose-limited chemostat cultures.
Limitations
The study did not include redox cofactors in the metabolite mass balances, which may limit the understanding of certain metabolic interactions.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website