Directed Evolution of an Enantioselective Lipase with Broad Substrate Scope for Hydrolysis of α-Substituted Esters
作者:Karin Engström、Jonas Nyhlén、Anders G. Sandström、Jan-E. Bäckvall
DOI:10.1021/ja100593j
日期:2010.5.26
Candida antarctica lipase A (CalA) was developed for the hydrolysis of alpha-substituted p-nitrophenyl esters by directed evolution. The E values of this variant for 7 different esters was 45-276, which is a large improvement compared to 2-20 for the wild type. The broad substrate scope of this enzyme variant is of synthetic use, and hydrolysis of the tested substrates proceeded with an enantiomeric
南极假丝酵母脂肪酶 A (CalA) 的一种变体被开发用于通过定向进化水解 α 取代的对硝基苯酯。该变体对 7 种不同酯的 E 值为 45-276,与野生型的 2-20 相比,这是一个很大的改进。这种酶变体的广泛底物范围具有合成用途,测试底物的水解以 95-99% 的对映体过量进行。大多数底物的活性也增加了 30 倍。开发的酶变体显示 (R) 选择性,与对大多数底物具有 (S) 选择性的野生型相比,这是相反的。