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Comparative global metabolite profiling of xylose-fermenting Saccharomyces cerevisiae SR8 and Scheffersomyces stipitis

Authors
Shin, MinhyeKim, Jeong-wonYe, SujiKim, SooahJeong, DeokyeolLee, Do YupKim, Jong NamJin, Yong-SuKim, Kyoung HeonKim, Soo Rin
Issue Date
7월-2019
Publisher
SPRINGER
Keywords
Saccharomyces cerevisiae; Scheffersomyces stipitis; GC-TOF; MS; Metabolomics; Xylose fermentation
Citation
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, v.103, no.13, pp.5435 - 5446
Indexed
SCIE
SCOPUS
Journal Title
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume
103
Number
13
Start Page
5435
End Page
5446
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/64237
DOI
10.1007/s00253-019-09829-5
ISSN
0175-7598
Abstract
Bioconversion of lignocellulosic biomass into ethanol requires efficient xylose fermentation. Previously, we developed an engineered Saccharomyces cerevisiae strain, named SR8, through rational and inverse metabolic engineering strategies, thereby improving its xylose fermentation and ethanol production. However, its fermentation characteristics have not yet been fully evaluated. In this study, we investigated the xylose fermentation and metabolic profiles for ethanol production in the SR8 strain compared with native Scheffersomyces stipitis. The SR8 strain showed a higher maximum ethanol titer and xylose consumption rate when cultured with a high concentration of xylose, mixed sugars, and under anaerobic conditions than Sch. stipitis. However, its ethanol productivity was less on 40 g/L xylose as the sole carbon source, mainly due to the formation of xylitol and glycerol. Global metabolite profiling indicated different intracellular production rates of xylulose and glycerol-3-phosphate in the two strains. In addition, compared with Sch. stipitis, SR8 had increased abundances of metabolites from sugar metabolism and decreased abundances of metabolites from energy metabolism and free fatty acids. These results provide insights into how to control and balance redox cofactors for the production of fuels and chemicals from xylose by the engineered S. cerevisiae.
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