通过对外膜蛋白的重新编码来进行聚乙烯二甲酸铁粉生物降解的工程大肠杆菌
Joan Giménez-Dejoz1, Paula Vidal2, Sonia Romero1
1Barcelona Supercomputing Center (BSC), 08034 Barcelona, Spain.
iScience
|February 3, 2026
概括
研究人员设计了大肠杆菌 (E. coli) 以使用计算设计的蛋白质来降解聚乙烯二甲 (PET) 粉末. 这一突破使大肠杆菌能够在不需要外部PETase基因的情况下分解PET.
科学领域:
- 生物技术是生物技术.
- 蛋白质工程是指蛋白质工程.
- 环境微生物学 环境微生物学
背景情况:
- 聚乙烯二甲 (PET) 是一种持久性塑料污染物.
- 聚乙烯的酶降解提供了一个可持续的回收解决方案.
- 塑料生物降解的微生物工程是一个活跃的研究领域.
研究的目的:
- 通过计算设计和工程设计大肠杆菌 (E. coli) 用于PET粉末的生物降解.
- 开发一种方法,用于在大肠杆菌蛋白中产生表面暴露的催化三,用于PET水解.
- 为了证明大肠杆菌能够利用PET粉末作为唯一的碳来源.
主要方法:
- 利用深度计算引导的蛋白质设计来引入Ser-His-Asp催化三元组.
- 采用基因编辑来设计大肠杆菌菌株的PET降解.
- 开发了一个计算工作流程,用于在细胞外或表面暴露的蛋白质中创建预先组织的催化三合体.
- 重编程的外膜蛋白OmpA与一个PETase活性变体.
主要成果:
- 工程E. coli菌株能够降解小于4.5纳米的PET颗粒.
- 成功地为PET降解重新编程了四种额外的蛋白质.
- 一个工程菌株在37°C的24小时内释放了157 ± 2μM的水解产物.
- 工程菌株在PET粉末作为碳来源上持续增长 (0.18 ± 0.07 h-1).
结论:
- 证明了在没有外源PETase基因的情况下设计大肠杆菌用于PET粉末生物降解的可行性.
- 计算式蛋白质设计是创建新型酶功能的一个强大工具.
- 这种方法对开发对塑料污染的微生物解决方案充满希望.
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