Properties and mechanistic aspects of newly found redox enzymes from anaerobes suitable for bioconversions on preparatory scale

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Abstract
Anaerobes or facultative anaerobic bacteria show interesting new types of reversible carbon-hydrogen bond forming enzymes in high activi- ties, which are often not NAD(P)(H) dependent. Their substrata specificity is very broad and nevertheless, their stereoselectivity very high. Some properties and results with enoate reductase, viologen accepting 2-hy- droxycarboxylate-oxidoreductase (HVOR), and aldehyde oxidoreductase, reduc- ing non-activated carboxylic acids to aldehydes, will be described. Due to the rather ubiquitous occurrence of viologen accepting pyridine nucleotide oxidoreductases (VAPOR) also yeasts can be used for reductions in electro- chemical cells with efficiencies much higher than with carbohydrates.

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