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Application of comparative proteome analysis to reveal influence of cultivation conditions on asymmetric bioreduction of β-keto ester by Saccharomyces cerevisiae


Industrial bakers’ yeast strain Saccharomyces cerevisiae LH1 was selected for asymmetric reduction of ethyl benzoylacetate to (S)-ethyl 3-hydroxy-3-phenylpropionate. Higher reductive efficiency and higher cofactor availability were obtained with the alternation of cultivation condition (mainly growth medium). Compared to the bioreduction by yeast cells grown in malt extract (ME) medium, the concentration of substrate was increased 25-fold (up to 15.6 g/l) in the yeast peptone dextrose (YPD)-grown cells mediated bioreduction with 97.5% of enantioselective excess of (S)-product. The proteomic responses of S. cerevisiae LH1 cells to growth in aerobic batch cultures fed with either YPD or ME medium were examined and compared. Among the relative quantities of 550 protein spots in each gel, changes were shown in the expression level of 102 intracellular proteins when comparing YPD gel to ME gel. Most of the identified proteins were involved in energy metabolism and several cellular molecular biosynthetic pathway and catabolism. For YPD-grown yeast cells, not only enzymes involved in nicotinamide adenine dinucleotide phosphate regeneration, especially 6-phosphogluconate dehydrogenase, but also alcohol dehydrogenase 1 and d-arabinose 1-dehydrogenase which had been demonstrated activity toward ethyl benzoylacetate to (S)-hydroxy ester were significantly upregulated. These changes provided us insight in the way the yeast cells adapted to a change in cultivation medium and regulated its catalytic efficiency in the bioreduction.

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This work was financially supported by Science and Technology Commission of Shanghai Municipality (STCSM), Project 054319937.

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Correspondence to Dongzhi Wei.

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Lin, J., Liu, Q., Su, E. et al. Application of comparative proteome analysis to reveal influence of cultivation conditions on asymmetric bioreduction of β-keto ester by Saccharomyces cerevisiae . Appl Microbiol Biotechnol 80, 831 (2008).

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  • Asymmetric bioreduction
  • Saccharomyces cerevisiae
  • Growth medium
  • Ethyl benzoylacetate
  • Proteome analysis