互补的远程和活性位点突变同时增强α-Galactosidase的催化活性和热稳定性
Zhuangzhuang Huang1, Junru Zhou1, Jialing Wang1
1College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 30 Puzhunan Road, Nanjing, Jiangsu 211816, China.
Journal of agricultural and food chemistry
|February 3, 2025
概括
研究人员设计了一种α-galactosidase酶,克服了活性-稳定性权衡. 这种酶在工业应用中显示出更好的催化效率和热稳定性,特别是在加工拉芬家族的寡糖中.
科学领域:
- 酶工程是什么?酶工程是什么?
- 生物催化剂是一种生物催化剂.
- 蛋白质工程是一种蛋白质工程.
背景情况:
- 酶工业应用受到活动稳定性权衡的阻碍.
- 提高酶的热稳定性往往会降低催化活性.
- 来自Anoxybacillus vitaminiphilus WMF1的α-galactosidase (galV) 是工业改进的一个目标.
研究的目的:
- 为了同时提高 galV 的催化效率和热稳定性.
- 为了克服酶工程中固有的活性-稳定性妥协.
- 开发一个精细的策略,用于工程工业适用的α-galactosidases.
主要方法:
- 综合计算分析和酶性质预测.
- 位点定向的突变发生,准催化和远程残留物.
- 对突变酶特性进行实验验证.
- 分子动力学 (MD) 模拟用于结构洞察.
主要成果:
- 鉴定出突变可以改善活动,但不会影响稳定性.
- 通过远部位突变实现了进一步的热稳定性增强.
- 开发了一种三重突变 (N549Q/T550N/Y634F),其催化效率增加了6.2倍.
- 在65°C时,突变酶的半衰期得到了3.2倍的改善.
- 在大豆奶中对拉芬家族寡糖 (RFOs) 进行了验证的水解活性.
结论:
- 采用双重战略的方法,成功地提高了乙烯的催化效率和热稳定性.
- 工程酶变体对工业应用具有重大潜力,例如RFO水解.
- 这项研究为工程酶提供了强大的方法,以克服活动稳定性权衡.
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