Production and characterization of a thermostable alcohol dehydrogenase that belongs to the aldo-keto reductase superfamily

M.P. Machielsen, A.R. Uria, S.W.M. Kengen, J. van der Oost

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Abstract

The gene encoding a novel alcohol dehydrogenase that belongs to the aldo-keto reductase superfamily has been identified in the hyperthermophilic archaeon Pyrococcus furiosus. The gene, referred to as adhD, was functionally expressed in Escherichia coli and subsequently purified to homogeneity. The enzyme has a monomeric conformation with a molecular mass of 32 kDa. The catalytic activity of the enzyme increases up to 100°C, and a half-life value of 130 min at this temperature indicates its high thermostability. AdhD exhibits a broad substrate specificity with, in general, a preference for the reduction of ketones (pH optimum, 6.1) and the oxidation of secondary alcohols (pH optimum, 8.8). Maximal specific activities were detected with 2,3-butanediol (108.3 U/mg) and diacetyl-acetoin (22.5 U/mg) in the oxidative and reductive reactions, respectively. Gas chromatrography analysis indicated that AdhD produced mainly (S)-2-pentanol (enantiomeric excess, 89%) when 2-pentanone was used as substrate. The physiological role of AdhD is discussed.
Original languageEnglish
Pages (from-to)233-238
JournalApplied and Environmental Microbiology
Volume72
Issue number1
DOIs
Publication statusPublished - 2006

Keywords

  • archaeon pyrococcus-furiosus
  • aldehyde ferredoxin oxidoreductase
  • tungsten-containing enzyme
  • thermococcus strain es-1
  • crystal-structure
  • molecular characterization
  • escherichia-coli
  • proteins
  • binding
  • sulfur

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