Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 38, Issue 3-4, Pages 536-544Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2005.07.007
Keywords
baker's yeast; enantioselective; (S)-4-chloro-3-hydroxybutanoate; (S)-3-hydroxy-3-phenylpropionate; genetic algorithm
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A recombinant Saccharomyces cerevisiae strain over-expressing the fatty acid synthase of S. cerevisiae and the glucose dehydrogenase of Bacillus subtilis was applied for enantioselective reduction of ethyl 4-chloro acetoacetate (CAAE) to ethyl (S)-4-chloro-3-hydroxybutanoate (S-CHBE) as well as the reduction of ethyl benzoylacetate (EBA) to ethyl (S)-3-hydroxy-3-phenylpropionate (S-HPPE). The reaction conditions for these asymmetric reductions were optimised by combining simple screening procedures and a stochastic search strategy (Genetic Algorithm). Complete conversion of 200 mM CAAE was achieved within 8 h in a two liquid phase system (water/n-butyl acetate). The S-CHBE yield (94%) and the product/biocatalyst ratio (1.9 mmol S-CHBE/g cell dry weight) were improved by 50 and 450%, respectively, compared to published data. The enantiomeric excess was 90%. Nearly complete conversion of 55 mM EBA was achieved within 48 h without addition of an organic solvent. The S-HPPE yield (74%) and the product/biocatalyst ratio (0.7 mmol S-HPPE/g cell dry weight) were improved by 20 and 350%, respectively, compared to published data. The enantiomeric excess was > 97% in the case of S-HPPE production. (c) 2005 Elsevier Inc. All rights reserved.
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