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

Paper ID Volume ID Publish Year Pages File Format Full-Text
17109 42641 2012 7 PDF Available
Title
Increased ethanol production from glycerol by Saccharomyces cerevisiae strains with enhanced stress tolerance from the overexpression of SAGA complex components
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 YPH499fps1Δgpd2Δ (pGcyaDak, pGupSpt3.15Cas) formed significantly more biomass compared to the strain YPH499fps1Δgpd2Δ (pGcyaDak, pGupCas), 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 YPH499fps1Δgpd2Δ (pGcyaDak, pGupSpt3.15Cas) was 1.8-fold more than that of strain YPH499fps1Δgpd2Δ (pGcyaDak, pGupCas), 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.

► Increased ethanol yield from glycerol in stress-tolerant Saccharomyces cerevisiae using gTME. ► Fermentative performances such as cell growth and ethanol yield were enhanced. ► The stress tolerance and levels of cellular membrane components were increased. ► 1.8-Fold improvement in ethanol yield using glycerol as the substrate.

Keywords
Glycerol; Saccharomyces cerevisiae; Ethanol; SAGA complex; SPT; Stress tolerance
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Increased ethanol production from glycerol by Saccharomyces cerevisiae strains with enhanced stress tolerance from the overexpression of SAGA complex components
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 51, Issue 4, 10 September 2012, Pages 237–243
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us