Abstract
For the huge amount of chiral chemicals and precursors that can potentially be produced by biocatalysis, there is a tremendous need of enzymes with new substrate spectra, higher enantioselectivity, and increased activity. In this paper, a highly active alcohol dehydrogenase is presented isolated from Nocardia globerula that shows a unique substrate spectrum toward different prochiral aliphatic ketones and bulky ketoesters as well as thioesters. For example, the enzyme reduced ethyl 4-chloro-3-oxo butanoate with an ee >99% to (S)-4-chloro-3-hydroxy butanoate. Very interesting is also the fact that 3-oxobutanoic acid tert-butylthioester is reduced with 49.4% of the maximal activity while the corresponding tert-butyloxyester is not reduced at all. Furthermore, it has to be mentioned that acetophenone, a standard substrate for many known alcohol dehydrogenases, is not reduced by this enzyme. The enzyme was purified from wild-type N. globerula cells, and the corresponding 915-bp-long gene was determined, cloned, expressed in Escherichia coli, and applied in biotransformations. The N. globerula alcohol dehydrogenase is a tetramer of about 135 kDa in size as determined from gel filtration. Its sequence is related to several hypothetical 3-hydroxyacyl-CoA dehydrogenases whose sequences were derived by whole-genome sequencing from bacterial sources as well as known mammalian 3-hydroxyacyl-CoA dehydrogenases and ß-hydroxyacyl-CoA dehydrogenases from different clostridiae.
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Acknowledgments
This work was supported by the “Bundesministerium für Bildung und Forschung” (Nachhaltige BioProduktion; Project “Entwicklung eines biokatalytischen und nachhaltigen Verfahrens zur industriellen Herstellung enantiomerenreiner Amine und Alkohole unter besonderer Berücksichtigung der Atomökonomie“).
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Parkot, J., Gröger, H. & Hummel, W. Purification, cloning, and overexpression of an alcohol dehydrogenase from Nocardia globerula reducing aliphatic ketones and bulky ketoesters. Appl Microbiol Biotechnol 86, 1813–1820 (2010). https://doi.org/10.1007/s00253-009-2385-x
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DOI: https://doi.org/10.1007/s00253-009-2385-x