Abstract
The stereochemistry of the hydride transfer in reactions catalyzed by NAD(H)-dependent alcohol dehydrogenase from Thermus thermophilus HB27 was determined by means of 1H-NMR spectroscopy. The enzyme transfers the pro-S hydrogen of [4R-2H]NADH and exhibits Prelog specificity. Enzyme-substrate docking calculations provided structural details about the enantioselectivity of this thermophilic enzyme. These results give additional insights into the diverse active site architectures of the largely versatile short-chain dehydrogenase superfamily enzymes. A feasible protocol for the synthesis of [4R-2H]NADH with high yield was also set up by enzymatic oxidation of 2-propanol-d8 catalyzed by Bacillus stearothermophilus alcohol dehydrogenase.
Keywords: Cofactor stereospecificity, Prelog rule, enantioselectivity, short-chain dehydrogenase/reductase, Thermus thermophilus, Bacillus stearothermophilus
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