High temperature stimulates acetic acid accumulation and enhances the growth inhibition and ethanol production by Saccharomyces cerevisiae under fermenting conditions

Ji Min Woo, Kyung Mi Yang, Sae Um Kim, Lars M. Blank, Jin Byung Park

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Cellular responses of Saccharomyces cerevisiae to high temperatures of up to 42°C during ethanol fermentation at a high glucose concentration (i.e., 100 g/L) were investigated. Increased temperature correlated with stimulated glucose uptake to produce not only the thermal protectant glycerol but also ethanol and acetic acid. Carbon flux into the tricarboxylic acid (TCA) cycle correlated positively with cultivation temperature. These results indicate that the increased demand for energy (in the form of ATP), most likely caused by multiple stressors, including heat, acetic acid, and ethanol, was matched by both the fermentation and respiration pathways. Notably, acetic acid production was substantially stimulated compared to that of other metabolites during growth at increased temperature. The acetic acid produced in addition to ethanol seemed to subsequently result in adverse effects, leading to increased production of reactive oxygen species. This, in turn, appeared to cause the specific growth rate, and glucose uptake rate reduced leading to a decrease of the specific ethanol production rate far before glucose depletion. These results suggest that adverse effects from heat, acetic acid, ethanol, and oxidative stressors are synergistic, resulting in a decrease of the specific growth rate and ethanol production rate and, hence, are major determinants of cell stability and ethanol fermentation performance of S. cerevisiae at high temperatures. The results are discussed in the context of possible applications.

Original languageEnglish
Pages (from-to)6085-6094
Number of pages10
JournalApplied Microbiology and Biotechnology
Volume98
Issue number13
DOIs
StatePublished - Jul 2014

Keywords

  • Acetic acid stress
  • Carbon metabolism
  • Heat stress
  • Oxidative stress
  • Reactive oxygen species
  • Saccharomyces cerevisiae

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