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Conversion of glycerol to 1,3-dihydroxyacetone by glycerol dehydrogenase co-expressed with an NADH oxidase for cofactor regeneration.

Biotechnology Letters 2016 September
OBJECTIVES: To investigate the efficiency of a cofactor regeneration enzyme co-expressed with a glycerol dehydrogenase for the production of 1,3-dihydroxyacetone (DHA).

RESULTS: In vitro biotransformation of glycerol was achieved with the cell-free extracts containing recombinant GlyDH (glycerol dehydrogenase from Escherichia coli), LDH (lactate dehydrogenase form Bacillus subtilis) or LpNox1 (NADH oxidase from Lactobacillus pentosus), giving DHA at 1.3 g l(-1) (GlyDH/LDH) and 2.2 g l(-1) (GlyDH/LpNox1) with total turnover number (TTN) of NAD(+) recycling of 6039 and 11100, respectively. Whole cells of E. coli (GlyDH-LpNox1) co-expressing both GlyDH and LpNox1 were constructed and converted 10 g glycerol l(-1) to DHA at 0.2-0.5 g l(-1) in the presence of zero to 2 mM exogenous NAD(+). The cell free extract of E. coli (GlyDH-LpNox) converted glycerol (2-50 g l(-1)) to DHA from 0.5 to 4.0 g l(-1) (8-25 % conversion) without exogenous NAD(+).

CONCLUSIONS: The disadvantage of the expensive consumption of NAD(+) for the production of DHA has been overcome.

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