以乙烯糖醇 (EG) 诱导的基于BmoR的生物传感器的定制,用于PET降解酶的定向演化
Min Li1, Zhenya Chen1,2,3, Wuyuan Zhang1
1Department of Gastroenterology, Aerospace Center Hospital, College of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Haidian District, Beijing, 100081, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 10, 2025
概括
研究人员开发了一种基于光的新型工具,以高效地设计塑料降解酶. 这种高通量选方法加速了分解聚乙烯二甲 (PET) 废物的酶的演变.
科学领域:
- 生物技术是生物技术.
- 酵素工程是什么意思 酵素工程
- 环境科学 环境科学
背景情况:
- 塑料废物,特别是聚乙烯二甲 (PET),对环境和健康构成重大风险.
- 开发高效的塑料降解酶对于废物管理至关重要,但由于缺乏高通量选 (HTS) 工具而受到阻碍.
- 现有的PETase酶面临表达,强度和中间抑制方面的挑战,限制了工业应用.
研究的目的:
- 开发一种基于光的新型高通量选 (HTS) 工具,用于工程聚乙烯二甲酸盐 (PET) 降解酶.
- 通过设计一个生物传感器来创建一个高效的酶进化系统,该生物传感器的目标是乙烯基醇 (EG),一种PET分解产物.
- 为增强PET降解和随后的上循环设计一种新型的酶嵌合体.
主要方法:
- 构建一个基于BmoR的生物传感器,对乙烯糖醇 (EG) 产生反应.
- 光激活细胞分类 (FACS) 辅助的转录因子工程,以优化生物传感器性能.
- 设计和表达一个SUMO-MHETase-FastPETase (SMF) 嵌合体,以提高酶活性和稳定性.
- 描述SMF突变的催化效率及其在PET废物上循环利用中的应用.
主要成果:
- 开发了一种具有增强动态和操作范围的新型EG响应生物传感器.
- 设计了SMF仿真体,该仿真体表现出改善的可溶性表达和缓解的中间抑制.
- SMM3F突变体表现出显著更高的甲基甲酸 (TPA) 产量 (1.59倍增加) 与改善的动力参数 (1.18倍减少Km,1.29倍增加Vmax,1.52倍增加kcat/Km).
- 证明了 bis-(2-乙烯) 甲基乙烯酸 (BHET) 完全脱聚变为TPA,并随后转化为增值原酸 (PCA) 和酸 (GA).
结论:
- 开发的基于光的HTS工具对大规模PET和MHET酶候选物的查有效.
- 设计的SMF迷幻体代表了PET生物降解和再循环的重大进步.
- 这项研究为完全生物降解PET废物和将其再循环转化为有价值的化学品建立了一个环保的途径.
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