An Esterase with Superior Activity and Enantioselectivity towards 1,2-<i>O</i>-Isopropylideneglycerol Esters Obtained by Protein Design
作者:Luis F. Godinho、Carlos R. Reis、Ronald van Merkerk、Gerrit J. Poelarends、Wim J. Quax
DOI:10.1002/adsc.201200211
日期:2012.11.12
selected as targets for mutagenesis, in order to enhance YbfF activity and enantioselectivity towards IPG esters. Random mutagenesis at positions 25, 124, 185 and 235 yielded several best YbfF variants with enhanced activity and enantioselectivity towards IPG esters. The best YbfF mutant, W235I, exhibited a 2-fold higher enantioselectivity than wild-type YbfF, with an E=38 for IPG butyrate and an E=77
的大肠杆菌酯酶YbfF显示高朝1,2-活性ø -isopropylideneglycerol(IPG)丁酸酯和辛酸IPG,和更喜欢ř这些底物对映体,产生š超过IPG产物的对映体。为了提高该酶用于动力学拆分IPG的外消旋酯的潜力,非常需要提高活性和对映选择性。R的分子对接两种IPG酯的对映体都进入YbfF的活性位点,从而鉴定了近端的YbfF活性位点残基。选择四个残基(25、124、185和235)作为诱变目标,以增强YbfF活性和对IPG酯的对映选择性。在位置25、124、185和235处进行随机诱变产生了几种最佳的YbfF变体,具有增强的活性和对IPG酯的对映选择性。最好YbfF突变体,W235I,表现出2倍与更高的对映选择性比野生型YbfF,Ë用于IPG丁酸和= 38 È对于IPG辛酸酯= 77。分子对接实验进一步支持了实验显示的增强的对映选择性,并提供了该氨基酸取代对YbfF活性位点的