title: Flux control-based design of furfural-resistance strains of Saccharomyces cerevisiae for lignocellulosic biorefinery.
abstract: We have previously developed a dynamic flux balance analysis of Saccharomyces cerevisiae for elucidation of genome-wide flux response to furfural perturbation (Unrean and Franzen, Biotechnol J 10(8):1248-1258, 2015). Herein, the dynamic flux distributions were analyzed by flux control analysis to identify target overexpressed genes for improved yeast robustness against furfural. The flux control coefficient (FCC) identified overexpressing isocitrate dehydrogenase (IDH1), a rate-controlling flux for ethanol fermentation, and dicarboxylate carrier (DIC1), a limiting flux for cell growth, as keys of furfural-resistance phenotype. Consistent with the model prediction, strain characterization showed 1.2- and 2.0-fold improvement in ethanol synthesis and furfural detoxification rates, respectively, by IDH1 overexpressed mutant compared to the control. DIC1 overexpressed mutant grew at 1.3-fold faster and reduced furfural at 1.4-fold faster than the control under the furfural challenge. This study hence demonstrated the FCC-based approach as an effective tool for guiding the design of robust yeast strains.
authors.affiliation: National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani, 12120, Thailand. pornkamol.unr@biotec.or.th.
authors.forename: Pornkamol
authors.initials: P
authors.lastname: Unrean
mesh_terms: D029382:Dicarboxylic Acid Transporters / Q000235:genetics / Q000378:metabolism; D025141:Drug Resistance, Fungal / Q000187:drug effects / Q000235:genetics; D005662:Furaldehyde / Q000494:pharmacology*; D007521:Isocitrate Dehydrogenase / Q000235:genetics / Q000378:metabolism; D008031:Lignin / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D029382:Dicarboxylic Acid Transporters; D029701:Saccharomyces cerevisiae Proteins; C036909:lignocellulose; D008031:Lignin; D005662:Furaldehyde; D007521:Isocitrate Dehydrogenase
keywords: Flux control coefficient; Furfural tolerance; Lignocellulosic biorefinery; Rational strain design; Saccharomyces cerevisiae