Abstract
We developed a metabolically engineered Saccharomyces cerevisiae, which produces optically pure l-lactic acid efficiently using cane juice-based medium. In this recombinant, the coding region of pyruvate decarboxylase (PDC)1 was completely deleted, and six copies of the bovine l-lactate dehydrogenase (l-LDH) genes were introduced on the genome under the control of the PDC1 promoter. To confirm optically pure lactate production in lowcost medium, cane juice-based medium was used in fermentation with neutralizing conditions. l-lactate production reached 122 g/L, with 61% of sugar being transformed into l-lactate finally. The optical purity of this l-lactate, that affects the physical characteristics of poly-l-lactic acid, was extremely high, 99.9% or over.
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Ishida, N., Saitoh, S., Ohnishi, T. et al. Metabolic engineering of Saccharomyces cerevisiae for efficient production of pure l−(+)−lactic acid. Appl Biochem Biotechnol 131, 795–807 (2006). https://doi.org/10.1385/ABAB:131:1:795
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DOI: https://doi.org/10.1385/ABAB:131:1:795