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实验室进化了具有广泛基质范围的Candida antarctica enantiocomplementary lipase B突变体的实验室进化
Qi Wu1, Pankaj Soni, Manfred T Reetz
1Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China.
Journal of the American Chemical Society
|January 11, 2013
概括
定向进化改进了Candida antarctica的B脂酶 (CALB) 解离酸的作用. 新的CALB突变在水解中显著增强了活性和酶选择性,克服了以前的限制.
科学领域:
- 生物催化剂是一种生物催化剂.
- 酵素工程是什么意思 酵素工程
- 有机化学 有机化学
背景情况:
- 坎迪达南极洲脂酶B (CALB) 是实验室中广泛使用的酶.
- CALB在乙化动态分辨率方面表现出色,但在或化酸的水解动态分辨率方面表现不佳.
- 基质的碳酸部分的奇拉性对CALB的效率和立体选择性构成挑战.
研究的目的:
- 为了增强CALB的活性和酶选择性,用于从奇拉酸中提取的的水解动态分辨率.
- 为了克服野生类型CALB在溶解基板中的局限性,在酸部分中存在性.
- 为精细化学合成开发改进的生物催化剂.
主要方法:
- 使用代和突变发生的定向进化被用来设计CALB.
- 作为模型反应,使用了p-nitrophenyl 2-phenylpropanoate的水解运动分辨率.
- 进行了分子动力学模拟和对接实验,以了解立体选择性的来源.
主要成果:
- 与野生类型的CALB相比,改造的CALB突变体表现出明显改善的活性和酶选择性.
- 对于目标基质,选择性因子 (E) 从1.2 (S) 增加到72 (S) 或42 (R).
- 发现CALB的acyl和酒精口袋中的突变对于提高性能至关重要.
- 一些进化的突变体在解决其他性的过程中表现出广泛的适用性,并表现出对抗互补性.
结论:
- 定向进化是一种有效的策略,可以克服CALB在溶解酸中的局限性.
- 进化后的CALB突变提供了优越的生物催化剂,用于奇拉性的动力分辨率.
- 该研究提供了对酶工程的见解,以改善立体选择性和酶补充性.
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