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- W2105765079 abstract "Coenzyme A (CoA) and its thioester derivatives are important precursor molecules for many industrially useful compounds such as esters, PHBs, lycopene and polyketides. Previously, in our lab we could increase the intracellular levels of CoA and acetyl-Coenzyme A (acetyl-CoA) by overexpressing one of the upstream rate-controlling enzymes pantothenate kinase with a concomitant supplementation of the precursor pantothenic acid to the cell culture medium. In this study, we showed that the CoA/acetyl-CoA manipulation system could be used to increase the productivity of industrially useful compounds derived from acetyl-CoA. We chose the production of isoamyl acetate as a model system. Isoamyl acetate is an important flavor component of sake yeast and holds a great commercial value. Alcohol acetyl transferase (AAT) condenses isoamyl alcohol and acetyl-CoA to produce isoamyl acetate. The gene ATF2, coding for this AAT was cloned and expressed in Escherichia coli. This genetic engineered E. coli produces isoamyl acetate, an ester, from intracellular acetyl-CoA when isoamyl alcohol is added externally to the cell culture medium. In the current study, we showed that in a strain bearing ATF2 gene, an increase in intracellular CoA/acetyl-CoA by overexpressing panK leads to an increase in isoamyl acetate production. Additionally, the cofactor manipulation technique was combined with more traditional approach of competing pathway deletions to further increase isoamyl acetate production. The acetate production pathway competes with isoamyl acetate production for the common intracellular metabolite acetyl-CoA. Earlier we have shown that acetate pathway deletion (ackA-pta) increases isoamyl acetate production. The acetate production pathway was inactivated under elevated CoA/acetyl-CoA conditions, which lead to a further increase in isoamyl acetate production." @default.
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- W2105765079 date "2004-10-01" @default.
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- W2105765079 title "Applicability of CoA/acetyl-CoA manipulation system to enhance isoamyl acetate production in Escherichia coli" @default.
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- W2105765079 doi "https://doi.org/10.1016/j.ymben.2004.02.006" @default.
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