通过计算设计增强糖转移酶UGT76G1的热稳定性和活性
Seong-Ryeong Go1,2, Su-Jin Lee1,2, Woo-Chan Ahn1
1Critical Diseases Diagnostics Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea.
Communications chemistry
|December 6, 2023
概括
研究人员增强了酵素UGT76G1以获得更好的工业用途. 计算设计提高了它的稳定性和rebaudioside A的生产,创造了一个更高效的糖替代酶.
科学领域:
- 生物技术是生物技术.
- 酶工程是什么? 酶工程是什么?
- 蛋白质设计 蛋白质设计
背景情况:
- 来自Stevia rebaudiana的二二甲基糖转移酶UGT76G1是rebaudioside A生产的关键.
- 由于热稳定性和酶特性差,UGT76G1的工业应用受到限制.
研究的目的:
- 通过计算蛋白质设计来增强UGT76G1的热稳定性和酶活性.
- 为了提高rebaudioside A的生产能力和减少副产品的工业可行性.
主要方法:
- 采用了结合稳定突变扫描和基于罗塞塔的蛋白质设计的计算设计策略.
- 同时引入多个突变来设计UGT76G1变种.
主要成果:
- 设计的变体76_4显示明显Tm增加9°C,并增加2.55倍的rebaudioside A产量.
- 变种76_4也实现了11%的降低副产品rebaudioside I.
- 变种76_7显示了1.91倍增强的rebaudioside A生产,稳定到55°C.
结论:
- 基于结构的设计通过多个同时发生的突变有效地改善了UGT76G1的酶特性.
- 开发的策略使得能够为工业应用创造高效,热稳定的酶.
- 改进的UGT76G1变种显示出改善天然甜味剂生产的巨大潜力.
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