通过N-终端修饰增强1,4-α-葡萄糖分枝酶的催化活性
Wenjuan Fan1, Zhaofeng Li2,1,3, Caiming Li1
1School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China.
Food chemistry: X
|December 25, 2023
概括
修改1,4-α-葡萄糖分支酶 (GBE) 的N端域增强了其催化活性. 特定突变显示了工业应用中粉分支和酶稳定性的增加.
科学领域:
- 酶学 是一种酶学.
- 生物化学 生物化学
- 工业生物技术 工业生物技术
背景情况:
- 1,4-α-葡萄糖分枝酶 (GBE) 对于粉的修饰至关重要,影响消化和工业用途.
- 已知GBE的N端域会影响酶的表达和稳定性.
- 提高GBE催化活性在食品和制药行业具有重大潜力.
研究的目的:
- 研究N端域在Gt-GBE催化活性中的作用.
- 通过向突变,通过改进的酶性质来设计Gt-GBE变体.
- 评估N端修改对粉分支和酶性能的影响.
主要方法:
- 使用局部定向突变发生,在Gt-GBE.的N端域内产生了五种不同的突变.
- 进行了酶活性测定,以量化野生类型和突变GBE的特定活性.
- 为了评估分支效率,对马尔托德克斯中α-1,6-糖酸结合比率进行了分析.
主要成果:
- 与野生型Gt-GBE相比,突变L25R和L25A表现出明显增加的特异性活动 (分别为28.46%和23.46%)
- 在用L25R和L25A治疗的马尔托德克斯中,α-1,6-糖酸结合比率增加到5.71%,比野生类型增加了19.96%.
- 这些结果表明,N端域的向修改可以显著增强GBE催化功能.
结论:
- 选择性修改N端域是改善GBE催化活性的有效策略.
- 具有增强分支能力的工程 GBE 变种对扩展的商业应用具有前景.
- 这项研究为进一步发展食品和制药行业的GBE提供了基础.
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