Systematic Investigation of <i>Saccharomyces </i><i>c</i><i>erevisiae</i> Enzymes Catalyzing Carbonyl Reductions
作者:Iwona A. Kaluzna、Tomoko Matsuda、Aileen K. Sewell、Jon D. Stewart
DOI:10.1021/ja0469479
日期:2004.10.1
each purified fusion protein. The stereoselectivities of beta-keto ester reductions depended both on the identity of the enzyme and the substrate structure, and some reductases yielded both L- and D-alcohols with high stereoselectivities. While alpha-keto esters were generally reduced with lower enantioselectivities, it was possible in all but one case to identify pairs of yeast reductases that delivered
Various β-keto esters have been reduced by one of β-keto ester reductases isolated frombakers’ yeast. The corresponding β-hydroxy esters have been obtained in excellent enantiomeric and diastereomeric excesses, respectively. It has also been elucidated that the reductase recognizes the stereochemistry not only at the β-carbon but also at the α-carbon affording one of the four possible diastereoisomers
Highly Stereoselective Reagents for β-Keto Ester Reductions by Genetic Engineering of Baker's Yeast
作者:Sonia Rodríguez、Margaret M. Kayser、Jon D. Stewart
DOI:10.1021/ja0027968
日期:2001.2.1
often observed since the organism contains a large number of reductase enzymes with overlapping substrate specificities but differing stereoselectivities. We sought to improve the performance of baker's yeast for beta-keto esterreductions by using recombinant DNA techniques to alter the levels of three enzymes known to play important roles in these reactions (fatty acid synthase, Fasp; aldo-keto reductase
Stereochemical control in microbial reduction. 19. Effect of heat-treatment on the diastereoselectivity in the reduction with baker's yeast
作者:Kaoru Nakamura、Yasushi Kawai、Atsuyoshi Ohno
DOI:10.1016/0040-4039(91)80651-l
日期:1991.6
Diastereoselectivity in the reduction of 2-alkyl-3-oxobutanoates is controlled by the heat-treatment of bakers' yeast. The heat-treated yeast exerts higher syn-selectivities than the untreated one.
diastereoselectivity in a bakers’ yeastreduction of various alkyl 2-alkyl-3-oxoalkanoates can be controlled by a thermal treatment of the yeast in the presence of methyl vinyl ketone. Pretreated bakers’ yeast gives the corresponding (2R,3S)-hydroxy esters selectively. Two β-keto ester reductases, named L-enzyme-1 and L-enzyme-2, are actual reductants of intact bakers’ yeastreduction. The thermal stability