Hydantoinase is an industrial enzyme widely used for the synthesis of nonnatural D- or L-amino acids. Optically pure amino acids are required for production of semisynthetic antibiotics, active peptides or agrochemicals such as pesticides, herbicides, pyrethroides, and are important as feed and food additives. Major advantages of application of hydantoinase in industry are: high efficiency, stereoselectivity, easy production of substrates for enzyme and environment friendly alternative to chemical methods.
Propentofylline (PPT) is a drug used in the treatment of both vascular dementia and Alzheimer type dementia. Hydroxy-metabolites of propentofylline (OHPPT) also demonstrate the same biological activity as the parent compound. As steroisomers of HOPPT are not commercially available, we had to produce them for pharmacological and pharmacokinetic studies. The aim of this study was to find the strains of Saccharomyces cerevisiae yielding enantiomerically pure (R)- or (S)-1-(5-hydroxyhexyl)-3,5-dimethyl-7-propylxanthin (OHPPT) from PPT. In this paper, we present the results of stereoselective reduction of PPT into OHPPT when catalysed by whole cells of baker's and a few strains of wine yeast in water and organic solvents.
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