Abstract
Three xylose-fermenting recombinant Zymomonas mobilis strains containing different Peno-talB/tktA operon terminators were engineered. Each showed similar levels of foreign protein expression and xylose fermentation performance. Strain CP4-P2-1 was further used to compare the glucose/xylose co-fermentation under various cultivation environments to improve the efficiency of the process. Optimal co-fermentation was achieved at 30–34 °C and pH 5.5 using xylose-grown preculture cells giving 20.5 g ethanol/l, ethanol productivity of 0.43 g/l h and ethanol yield of 0.44 g/g at 48 h. Adverse culture conditions mainly influenced the efficiency of xylose fermentation but not glucose fermentation. The key factors affecting co-fermentation were also explored at the molecular level. This study provides valuable insights into the effective harnessing of biomass resources.
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Ma, Y., Dong, H., Zou, S. et al. Comparison of glucose/xylose co-fermentation by recombinant Zymomonas mobilis under different genetic and environmental conditions. Biotechnol Lett 34, 1297–1304 (2012). https://doi.org/10.1007/s10529-012-0897-4
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DOI: https://doi.org/10.1007/s10529-012-0897-4