Abstract
Reduction of bicyclo[2.2.2]octane-2,6-dione to (1R, 4S, 6S)-6-hydroxy-bicyclo[2.2.2]octane-2-one by whole cells of Saccharomyces cerevisiae was improved using an engineered recombinant strain and process design. The substrate inhibition followed a Han-Levenspiel model showing an effective concentration window between 12 and 22 g/l, in which the activity was kept above 95%. Yeast growth stage, substrate concentration and a stable pH were shown to be important parameters for effective conversion. The over-expression of the reductase gene YDR368w significantly improved diastereoselectivity compared to previously reported results. Using strain TMB4110 expressing YDR368w in batch reduction with pH control, complete conversion of 40 g/l (290 mM) substrate was achieved with 97% diastereomeric excess (de) and >99 enantiomeric excess (ee), allowing isolation of the optically pure ketoalcohol in 84% yield.
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Acknowledgement
We would like to thank Dr. Ed Van Niel for help with the Han-Levenspiel kinetic model, Nora Bieler for her assistance with the bioreductions and Prof. Bärbel Hahn-Hägerdal for critically reading the manuscript.
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Johanson, T., Carlquist, M., Olsson, C. et al. Reaction and strain engineering for improved stereo-selective whole-cell reduction of a bicyclic diketone. Appl Microbiol Biotechnol 77, 1111–1118 (2008). https://doi.org/10.1007/s00253-007-1240-1
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DOI: https://doi.org/10.1007/s00253-007-1240-1