Mapping the substrate selectivity of new hydrolases using colorimetric screening: lipases from Bacillus thermocatenulatus and Ophiostoma piliferum, esterases from Pseudomonas fluorescens and Streptomyces diastatochromogenes
作者:Andrew Man Fai Liu、Neil A Somers、Romas J Kazlauskas、Terry S Brush、Frank Zocher、Markus M Enzelberger、Uwe T Bornscheuer、Geoff P Horsman、Alessandra Mezzetti、Claudia Schmidt-Dannert、Rolf D Schmid
DOI:10.1016/s0957-4166(01)00072-6
日期:2001.3
screened a general library of 29 substrates and a chiral library of 23 pairs of enantiomers. All four hydrolases catalysed the hydrolysis of unnatural substrates, but the two lipases accepted a broader range of substrates than the two esterases. As expected, the two lipases favoured more hydrophobic substrates, while the two esterases showed a preference for smaller substrates. Several moderately enantioselective
生物化学和分子生物学的最新进展简化了新型水解酶的发现和制备。尽管这些水解酶可能解决了有机合成中的问题,但测量其选择性(尤其是对映选择性)仍然繁琐且耗时。最近,我们开发了一种比色筛选方法来测量水解酶的对映选择性。在这里,我们应用这种快速筛选方法来绘制四种新型水解酶的底物选择性图:来自嗜热芽孢杆菌的脂肪酶(DSM 730,BTL2)和丝状真菌Ophiostoma piliferum(NRRL 18917,OPL)以及来自两种细菌荧光假单胞菌(Pseudomonas fluorescens( SIK-W1,酯酶I,PFE)和链霉菌(Tü20,SDE)。我们筛选了29种底物的通用文库和23对对映异构体的手性文库。所有四种水解酶均催化非天然底物的水解,但是与两种酯酶相比,两种脂肪酶接受的底物范围更广。不出所料,这两种脂肪酶偏爱疏水性更高的底物,而两种酯酶则偏爱较小的底物。确认了该酚醛酸酯的一些中等对映选择性反应:BTL2,丁酸酯,E