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Cofactor regeneration in phototrophic cyanobacteria applied for asymmetric reduction of ketones

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Abstract

The obligate photoautotrophic cyanobacterium Synechococcus PCC7942 and the photoheterotrophic heterocystous cyanobacterium Noctoc muscorum are able to reduce prochiral ketones asymmetrically to optical pure chiral alcohols without light. An example is the synthesis of S-pentafluoro(phenyl-)ethanol with an enantiomeric excess >99% if 2′-3′-4′-5′-6′-pentafluoroacetophenone is used as substrate. If no light is available for regeneration of the cofactor nicotinamide adenine dinucleotide phosphate (reduced form) (NADPH), glucose is used as cosubstrate. Membrane disintegration during asymmetric reduction promotes cytosolic energy generating metabolic pathways. Observed regulatory effects depicted by an adenosine triphosphate (ATP) to nicotinamide adenine dinucleotide phosphate (oxidized form) (NADP+) ratio of 3:1 for efficient cofactor recycling indicate a metabolization via glycolisis. The stoichiometric formation of the by-product acetate (1 mol acetate/1 mol chiral alcohol) indicates homoacetic acid fermentation for cofactor regeneration including the obligate photoautotrophic cyanobacterium Synechococcus PCC7942.

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  1. Lehrstuhl für Bioverfahrenstechnik, Technische Universität München, Boltzmannstr. 15, 85748, Garching, Germany

    Jan Havel & Dirk Weuster-Botz

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  1. Jan Havel
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  2. Dirk Weuster-Botz
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Correspondence to Dirk Weuster-Botz.

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Havel, J., Weuster-Botz, D. Cofactor regeneration in phototrophic cyanobacteria applied for asymmetric reduction of ketones. Appl Microbiol Biotechnol 75, 1031–1037 (2007). https://doi.org/10.1007/s00253-007-0910-3

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  • DOI: https://doi.org/10.1007/s00253-007-0910-3

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