Biotechnology and Bioprocess Engineering 2021; 26(1): 47-54  
Evaluating the Engineered Saccharomyces cerevisiae With High Spermidine Contents for Increased Tolerance to Lactic, Succinic, and Malic Acids and Increased Xylose Fermentation
Sun-Ki Kim and Joong-Hyuck Auh
Sun-Ki Kim*, Joong-Hyuck Auh*
Department of Food Science and Technology, Chung-Ang University, Anseong 17546, Korea
Tel: +82-31-670-3261; Fax: +82-31-675-3108
E-mail: skkim18@cau.ac.kr
Tel: +82-31-670-3079; Fax: +82-31-675-4853
E-mail: jhauh@cau.ac.k
Received: January 16, 2020; Revised: March 18, 2020; Accepted: March 25, 2020; Published online: February 28, 2021.
© The Korean Society for Biotechnology and Bioengineering. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Saccharomyces cerevisiae is a promising candidate for production of organic acids as it is more tolerant to these acids than the prokaryotes. However, the large-scale production of organic acids from lignocellulosic biomass is limited by their accumulation in the growth medium and inability of xylose fermentation by S. cerevisiae. Here we showed that high intracellular spermidine (SPD) contents confers enhanced tolerance to lactic, succinic, and malic acids in S. cerevisiae. Specifically, in the presence of 20 g/L malic acid, the maximum specific growth rate and dry cell weight of a S. cerevisiae with two fold higher SPD content were 40% and 36% higher than those of the control strain. When a xylose assimilation pathway was introduced into an engineered strain with high SPD content, the resulting S. cerevisiae strain exhibited 23~47% higher xylose consumption rate and 6~16% higher ethanol productivity than those of the control strain during the four times of repeated-batch fermentations using a mixture of glucose and xylose as carbon sources. These results suggest that the strain developed in this study would serve as a platform strain for production of organic acids.
Keywords: organic acid tolerance, xylose fermentation, Saccharomyces cerevisiae, spermidine


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