화학공학소재연구정보센터
Biotechnology and Bioengineering, Vol.114, No.9, 2075-2084, 2017
Enhanced D-lactic Acid Production by Recombinant Saccharomyces cerevisiae Following Optimization of the Global Metabolic Pathway
Utilization of renewable feedstocks for the production of bio-based chemicals such as D-lactic acid by engineering metabolic pathways in the yeast Saccharomyces cerevisiae has recently become an attractive option. In this study, to realize efficient D-lactic acid production by S. cerevisiae, the expression of 12 glycolysis-related genes and the Leuconostoc mesenteroidesd-LDH gene was optimized using a previously developed global metabolic engineering strategy, and repeated batch fermentation was carried out using the resultant strain YPH499/dPdA3-34/DLDH/1-18. Stable D-lactic acid production through 10 repeated batch fermentations was achieved using YPH499/dPdA3-34/DLDH/1-18. The average D-lactic acid production, productivity, and yield with 10 repeated batch fermentations were 60.3 g/L, 2.80 g/L/h, and 0.646, respectively. The present study is the first report of the application of a global metabolic engineering strategy for bio-based chemical production, and it shows the potential for efficient production of such chemicals by global metabolic engineering of the yeast S. cerevisiae. (c) 2017 Wiley Periodicals, Inc.