Elucidation of ethanol tolerance mechanisms in Saccharomyces cerevisiae by global metabolite profiling

Sooah Kim, Jungyeon Kim, Ju Hwan Song, Young Hoon Jung, Il Sup Choi, Wonja Choi, Yong Cheol Park, Jin Ho Seo, Kyoung Heon Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Ethanol, the major fermentation product of yeast, is a stress factor in yeast. We previously constructed an ethanol-tolerant mutant yeast iETS3 by using the global transcriptional machinery engineering. However, the ethanol-tolerance mechanism has not been systematically investigated. In this study, global metabolite profiling was carried out, mainly by gas chromatography/time-of-flight mass spectrometry (GC/TOF MS), to investigate the mechanisms of ethanol tolerance in iETS3. A total of 108 intracellular metabolites were identified by GC/TOF MS and high performance liquid chromatography, and these metabolites were mostly intermediates of the central carbon metabolism. The metabolite profiles of iETS3 and BY4741, cultured with or without ethanol, were significantly different based on principal component and hierarchical clustering analyses. Our metabolomic analyses identified the compositional changes in cell membranes and the activation of glutamate metabolism and the trehalose synthetic pathway as the possible mechanisms for the ethanol tolerance. These metabolic traits can be considered possible targets for further improvement of ethanol tolerance in the mutant. For example, the KGD1 deletion mutant, with up-regulated glutamate metabolism, showed increased tolerance to ethanol. This study has demonstrated that metabolomics can be a useful tool for strain improvement and phenotypic analysis of microorganisms under stress.

Original languageEnglish
Pages (from-to)1221-1229
Number of pages9
JournalBiotechnology Journal
Volume11
Issue number9
DOIs
Publication statusPublished - 2016 Sep 1

Keywords

  • Ethanol tolerance
  • Metabolite profiling
  • Metabolomics
  • Saccharomyces cerevisiae

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Molecular Medicine

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  • Cite this

    Kim, S., Kim, J., Song, J. H., Jung, Y. H., Choi, I. S., Choi, W., Park, Y. C., Seo, J. H., & Kim, K. H. (2016). Elucidation of ethanol tolerance mechanisms in Saccharomyces cerevisiae by global metabolite profiling. Biotechnology Journal, 11(9), 1221-1229. https://doi.org/10.1002/biot.201500613