Biocatalytic Racemization of (Hetero)Aryl-aliphatic α-Hydroxycarboxylic Acids byLactobacillus spp. Proceeds via an Oxidation–Reduction Sequence
作者:Bettina M. Nestl、Silvia M. Glueck、Melanie Hall、Wolfgang Kroutil、Rainer Stuermer、Bernhard Hauer、Kurt Faber
DOI:10.1002/ejoc.200600454
日期:2006.10
The biocatalytic racemization of a range of (hetero)aryl- and (di)aryl-aliphatic α-hydroxycarboxylic acids has been achieved by using whole resting cells of Lactobacillus spp. The essentially mild (physiological) reaction conditions ensure the suppression of undesired side reactions, such as elimination, decomposition or condensation. Cofactor/inhibitor studies using a cell-free extract of Lactobacillus
一系列(杂)芳基-和(二)芳基-脂肪族α-羟基羧酸的生物催化外消旋化已通过使用乳杆菌属的整个静息细胞实现。基本上温和的(生理)反应条件确保抑制不需要的副反应,例如消除、分解或缩合。使用副干酪乳杆菌 DSM 20207 无细胞提取物的辅因子/抑制剂研究表明,添加氧化还原辅因子 (NAD+/NADH) 导致外消旋化率明显增加,而在存在硫代-NAD+ 的情况下观察到强烈的抑制作用,这表明外消旋化是通过氧化还原序列进行的,而不是“外消旋酶”的参与。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)