设计一种循环酶级联,以从马尔托德克斯基质中有效地进行三糖生物合成
Qi Liu1, Yangyang Li1, Haidong Huang1
1Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Science Center for Future Foods, Ministry of Education, Jiangnan University, Wuxi 214122, China.
Bioresource technology
|November 5, 2025
概括
这项研究设计了酶,以改善三糖 (一种在食品和医药中使用的糖) 的生产. 一个新的酶级联使用马尔托德克斯实现了创纪录的84.31%的转化率,增强了生物合成三糖的生产.
科学领域:
- 生物技术是生物技术.
- 酵素工程是什么? 酶工程是什么
- 碳水化合物化学 碳水化合物化学
背景情况:
- 糖是一种有价值的二糖体,由于其稳定性和蛋白质保护性质,在制药,食品和化品中具有应用.
- 目前的工业三糖生产采用两步的酶过程 (maltooligosyltrehalose synthase和maltooligosyltrehalose trehalohydrolase),但由于转化率低和副产品积累而受到影响.
- 低于最佳的酶性能和非可转换的短链马尔图糖的产生限制了现有的三糖生物合成途径的效率.
研究的目的:
- 通过计算机辅助的酶工程来提高参与三糖生物合成的关键酶 (TreY和TreZ) 的热稳定性和催化效率.
- 识别和整合一种新型酶,能够将积累的短链黄糖糖酸转化为可用于三糖路径的可用基质.
- 开发一种高效,循环的多酶级联,用于从低成本基质中生产高效的生物合成三糖.
主要方法:
- 计算机辅助的酶工程被用来修改来自Arthrobacter ramosus的maltooligosyltrehalose synthase (TreY) 和maltooligosyltrehalose trehalohydrolase (TreZ) 的酶.
- 计算查发现了一个来自Corallococcus sp.的4-α-葡萄糖转移酶 (CSMalQ). 具有高效率的EGB在不成比例的短链马尔托酸糖中.
- 通过整合工程Trey,TreZ和已识别的CSMalQ来构建一个循环多酶级联,使用马尔托德克斯作为主要基质.
主要成果:
- 改造的TreZ突变T212P显示热稳定性增加了32.3%.
- 改造的Trey突变M1显示了2.97倍的热稳定性改善和0.63倍的催化活性增加.
- 综合循环多酶级联通过有效回收马尔托利戈糖,实现了84.31%的三糖转化率,这是迄今为止报告的最高水平.
结论:
- 酶工程显著提高了三糖生物合成中的关键酶的性能.
- 集成CSMalQ有效地解决了短链马尔托利高糖积的问题,提高了基质利用率.
- 开发的循环多酶级联为工业化生物合成三糖生产提供了一个有前途和高效的战略.
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