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Subject    Enhanced ethanol fermentation by engineered Saccharomyces cerevisiae strains with high spermidine contents
Sun-Ki Kim, Jung-Hyun Jo, Yong-Su Jin, and Jin-Ho Seo. et al.
Bioprocess and Biosystems Engineering
Enhanced ethanol fermentation by engineered Saccharomyces cerevisiae strains with high spermidine contents  

 Sun-Ki Kim, Jung-Hyun Jo, Yong-Su Jin, and Jin-Ho Seo.

Bioprocess Biosyst Eng (2017) 40:683–691


Abstract
Construction of robust and efficient yeast strains is a prerequisite for commercializing a biofuel production process. We have demonstrated that high intracellular spermidine (SPD) contents in Saccharomyces cerevisiae can lead to improved tolerance against various fermentation inhibitors including furan derivatives and acetic acid. In this study, we examined the potential applicability of the S. cerevisiae strains with high SPD contents under two cases of ethanol fermentation: glucose fermentation in repeated batch fermentations and xylose fermentation in the presence of fermentation inhibitors. During the sixteen times of repeated-batch fermentations using glucose as a sole carbon source, the S. cerevisiae strains with high SPD contents maintained higher cell viabilities and ethanol productivities than a control strain with lower SPD contents. Specifically, at the sixteenth fermentation, the ethanol productivity of a S. cerevisiae strain with two fold higher SPD content was 31% higher than that of the control strain. When the SPD content was elevated in an engineered S. cerevisiae capable of fermenting xylose, the resulting S. cerevisiae strain exhibited much 40-50% higher ethanol productivities than the control strain during the fermentations of synthetic hydrolysate containing high concentrations of fermentation inhibitors. These results suggest that the strain engineering strategy to increase SPD content is broadly applicable for engineering yeast strains for robust and efficient production of ethanol.
 
Keywords: biofuels; spermidine; xylose; repeated-batch fermentation; inhibitor tolerance




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Subject
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202 2017     Enhanced production of 2,3-butanediol from xylose by combinatorial engineering of xylose metabolic pathway and cofactor regeneration in pyruvate decarboxylase-deficient Saccharomyces cerevisiae
Soo-Jung Kim,Hee-Jin Sim,Jin-Ho Seo
2017/06/07  267
201 2017     Construction of efficient xylose-fermenting Saccharomyces cerevisiae through a synthetic isozyme system of xylose reductase from Scheffersomyces stipitis
Jung-Hyun Jo, Jin-Ho Seo et al.
Bioresource Technology
2017/05/25  269
200 2017     Metabolic engineering of Saccharomyces cerevisiae for production of spermidine under optimal culture conditions
Sun-Ki Kim, Jung-Hyun Jo, Yong-Cheol Park, Yong-Su Jin, Jin-Ho Seo et al.
Enzyme and Microbial Technology
2017/03/22  675
199 2017     High production of 2,3-butanediol from glycerol without 1,3-propanediol formation by Raoultella ornithinolytica B6
Taeyeon Kim, Jin-Ho Seo et al.
Applied Microbiology and Biotechnology
2017/03/20  498
198 2016     Metabolic engineering of Saccharomyces cerevisiae for 2,3-butanediol production
Soo-Jung Kim, Jin-Ho Seo. et al.
Applied Microbiology and Biotechnology
2017/02/03  845
2016     Enhanced ethanol fermentation by engineered Saccharomyces cerevisiae strains with high spermidine contents
Sun-Ki Kim, Jung-Hyun Jo, Yong-Su Jin, and Jin-Ho Seo. et al.
Bioprocess and Biosystems Engineering
2016/12/27  861
196 2016     Bioethanol production from cellulosic hydrolysates by engineered industrial Saccharomyces cerevisiae
Ye-Ji Lee , Yong-Su Jin, Jin-Ho Seo. et al.
Bioresource Technology
2016/12/12  875
195 2016     Improved production of 2’-fucosyllactose in engineered Escherichia coli by expressing putative α-1,2-fucosyltransferase, WcfB from Bacteroides fragilis
Young-Wook Chin, Jin-Ho Seo. et al.
Journal of Biotechnolog
2016/12/01  802
194 2016     Enhanced production of 2,3-butanediol by engineered Saccharomyces cerevisiae through fine-tuning of pyruvate decarboxylase and NADH oxidase activities.
Jin-Woo Kim, Jin-Ho Seo. et al.
Biotechnology for Biofuels
2016/11/25  711
193 2016     High Production of 2,3-Butanediol (2,3-BD) by Raoultella ornithinolytica B6 via Optimizing Fermentation Conditions and Overexpressing 2,3-BD Synthesis Genes.
Tae-yeon Kim, Jin-Ho Seo et al.
PLoS ONE
2016/10/25  719
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