Overexpressing enzymes of the Ehrlich pathway and deleting genes of the competing pathway in Saccharomyces cerevisiae for increasing 2-phenylethanol production from glucose
pmid: 26975754
Overexpressing enzymes of the Ehrlich pathway and deleting genes of the competing pathway in Saccharomyces cerevisiae for increasing 2-phenylethanol production from glucose
2-Phenylethanol (2-PE) is a higher aromatic alcohol that is used in the cosmetics and food industries. The budding yeast Saccharomyces cerevisiae is considered to be a suitable host for the industrial production of higher alcohols, including 2-PE. To produce 2-PE from glucose in S. cerevisiae, we searched for suitable 2-keto acid decarboxylase (KDC) and alcohol dehydrogenase (ADH) enzymes of the Ehrlich pathway for overexpression in strain YPH499, and found that overexpression of the ARO10 and/or ADH1 genes increased 2-PE production from glucose. Further, we screened ten BY4741 single-deletion mutants of genes involved in the competing pathways for 2-PE production, and found that strains aro8Δ and aat2Δ displayed increased 2-PE production. Based on these results, we engineered a BY4741 strain that overexpressed ARO10 and contained an aro8Δ deletion, and demonstrated that the strain produced 96 mg/L 2-PE from glucose as the sole carbon source. As this engineered S. cerevisiae strain showed a significant increase in 2-PE production from glucose without the addition of an intermediate carbon substrate, it is a promising candidate for the large-scale production of 2-PE.
- Kobe University Japan
- Osaka University Japan
Bioreactors, Glucose, Saccharomyces cerevisiae Proteins, Metabolic Engineering, Alcohol Dehydrogenase, Saccharomyces cerevisiae, Phenylethyl Alcohol, Gene Deletion, Biosynthetic Pathways
Bioreactors, Glucose, Saccharomyces cerevisiae Proteins, Metabolic Engineering, Alcohol Dehydrogenase, Saccharomyces cerevisiae, Phenylethyl Alcohol, Gene Deletion, Biosynthetic Pathways
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