Increased ethanol production from glycerol by Saccharomyces cerevisiae strains with enhanced stress tolerance from the overexpression of SAGA complex components

Kyung Ok Yu, Ju Jung, Ahmad Bazli Ramzi, Se Hoon Choe, Seung Wook Kim, Chulhwan Park, Sung Ok Han

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

During the industrial production of ethanol using yeast, the cells are exposed to stresses that affect their growth and productivity; therefore, stress-tolerant yeast strains are highly desirable. To increase ethanol production from glycerol, a greater tolerance to osmotic and ethanol stress was engineered in yeast strains that were impaired in endogenous glycerol production by the overexpression of both SPT3 and SPT15, components of the SAGA (Spt-Ada-Gcn5-acetyltransferase) complex. The engineered strain YPH499. fps1Δgpd2Δ (p. GcyaDak, p. GupSpt3.15Cas) formed significantly more biomass compared to the strain YPH499. fps1Δgpd2Δ (p. GcyaDak, p. GupCas), and both engineered strains displayed increased biomass when compared to the control YPH499 fps1Δgpd2Δ (pESC-TRP) strain. The trehalose accumulation and ergosterol content of these strains were 2.3-fold and 1.6-fold higher, respectively, than the parent strains, suggesting that levels of cellular membrane components were correlated with the enhanced stress tolerance of the engineered strains. Consequently, the ethanol production of the engineered strain YPH499. fps1Δgpd2Δ (p. GcyaDak, p. GupSpt3.15Cas) was 1.8-fold more than that of strain YPH499. fps1Δgpd2Δ (p. GcyaDak, p. GupCas), with about 8.1. g/L ethanol produced. In conclusion, we successfully established that the co-expression of SPT3 and SPT15 that improved the fermentation performance of the engineered yeast strains which produced higher ethanol yields than stress-sensitive yeast strains.

Original languageEnglish
Pages (from-to)237-243
Number of pages7
JournalEnzyme and Microbial Technology
Volume51
Issue number4
DOIs
Publication statusPublished - 2012 Sep 10

Keywords

  • Ethanol
  • Glycerol
  • Saccharomyces cerevisiae
  • SAGA complex
  • SPT
  • Stress tolerance

ASJC Scopus subject areas

  • Biochemistry
  • Biotechnology
  • Applied Microbiology and Biotechnology

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