揭示了α-L-fucosidase B活动的结构基础,通过突变来提高转化效率
Jimmy E Becerra1, Francisca Gallego Del Sol2, Antonio Rubio-Del-Campo1
1Laboratorio de Bacterias Lácticas y Probióticos, Departamento de Biotecnología de Alimentos, Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Valencia, Spain.
International journal of biological macromolecules
|April 26, 2025
概括
来自Lacticaseibacillus paracasei的工程AlfB酶变体显示出增强的转化活性. 在AlfB中发生的一种特定突变 (N346K) 实现了100%的可-α1,3-N-乙糖胺合成产量.
科学领域:
- 酶学 是一种酶学.
- 蛋白质工程是指蛋白质工程.
- 生物技术是生物技术.
背景情况:
- 来自Lacticaseibacillus paracasei的α-L-fucosidase AlfB对fucosyl-α1,3-N-acetylglucosamine具有很高的特异性.
- 在转化反应中,AlfB可以获得30%的产量来合成这种化合物.
- 提高AlfB的转化活性对于高效的酶合成至关重要.
研究的目的:
- 为了设计具有改进的转化活性的AlfB变体.
- 为了确定负责增强酶性能的特定突变.
- 为了阐明转化产量的改善背后的机制.
主要方法:
- 阿尔夫B基因的随机突变发生.
- 在大肠杆菌中alfB突变体的表达和活性查.
- 野生类型和突变酶的酶特征 (kcat,Km) 和X射线晶体学.
主要成果:
- 隔离了18个AlfB变体,具有改变的酶参数.
- 一个突变 (M58) 在福科西尔-α1,3-N-乙烯基葡萄糖胺合成中获得了100%的产量.
- 确定N346K突变足以产生最大产量,结构分析揭示了其在活性部位附近的机制.
结论:
- 蛋白质工程可以显著提高AlfB的转化效率.
- 这种N346K突变为最大限度地促进fucosyl-oligosaccharide合成提供了一种策略.
- 工程AlfB变体是生物技术应用的有希望的工具,用于合成特定的fucosyl-oligosaccharides.
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