对耐热MHETase进行计算重新设计,以通过双酶系统完成聚乙烯四甲酸盐的完全降解
Yunxin Zheng1, Jiaxing Zhang1,2, Tao Gu3
1Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China.
ACS synthetic biology
|December 17, 2025
概括
聚乙烯二甲酸盐 (PET) 的酶循环通过工程化碳酸酶EstD9来提高其活性和热稳定性而得到增强. 这种双酶系统显著提高了工业应用中的PET降解效率.
科学领域:
- 生物技术和生物工程 生物技术和生物工程
- 酶工程是什么? 酶工程是什么?
- 聚合物回收利用 聚合物回收利用
背景情况:
- 聚乙烯二甲 (PET) 由于缓慢降解而带来环境挑战.
- 使用PETase/MHETase系统的酶循环是有希望的,但受到MHETase热稳定性和效率的限制.
- 在PETase和MHETase之间不匹配的最佳条件阻碍了工业可扩展性.
研究的目的:
- 为增强活性和热稳定性,设计热友性碳酸酶 (EstD9).
- 用PETase创建一个高性能双酶系统,并设计EstD9以实现高效的PET降解.
- 为了提高酶性PET回收的工业可扩展性.
主要方法:
- 电脑重新设计碳酸酶EstD9以提高活性和热稳定性.
- 使用PETase和工程EstD9 (11M-MHETase) 构建一个双酶系统.
- 优先考虑低风险的突变发生和组合设计,以减轻表皮性影响.
- 使用分子动力学模拟和第一原则计算分析分子机制.
主要成果:
- 工程11M-MHETase显示,催化效率 (kcat/Km) 提高了95倍,化温度增加了16.4°C.
- 与非工程系统相比,增强的双酶系统 (LCC-YGA-11M-MHETase) 实现了甲酸 (TPA) 产量增加158.3%.
- 通过低风险的组合性突变发生成功缓解了表皮性影响.
结论:
- 改造的EstD9突变体 (11M-MHETase) 有效地补充PETase,为PET降解创造了一个高效的双酶系统.
- 拟议的低风险组合设计策略加速了工业应用的酶性能改善.
- 这项研究为工业酶的热稳定性工程提供了一种有效的方法,为可扩展的PET回收利用铺平了道路.
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