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
来自面包酵母 (Saccharomyces cerevisiae) 的 18 种关键还原酶在大肠杆菌中作为
谷胱甘肽 S 转移酶融合蛋白过量产生。测试了一组代表性的 α-和β-
酮酯作为每种纯化融合蛋白的底物(共 11 个)。β-
酮酯还原的立体选择性取决于酶的特性和底物结构,并且一些还原酶产生具有高立体选择性的 L-和 D-醇。虽然α-
酮酯通常以较低的对映选择性还原,但除了一种情况外,在所有情况下都有可能鉴定出以光学纯形式提供两种醇对映体的酵母还原酶对。总之,结果表明不仅单个酵母还原酶可用于提供重要的手性构建块,