基于计算循环重建的高效PET水溶的设计
Hongzhao Wang1, Yuntao Cun1, Minxuan Wang1,2
1College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China.
Communications biology
|June 17, 2025
概括
通过循环重建开发了具有增强热稳定性和活性的工程PET水解酶. 这些改进的酶显示出高的PET转化效率,为工业塑料回收和循环经济铺平了道路.
科学领域:
- 生物技术是生物技术.
- 聚合物科学 聚合物科学
- 环境科学 环境科学
背景情况:
- 聚乙烯二甲 (PET) 的酶去聚合对于塑料循环经济至关重要.
- 目前对酶活性的限制阻碍了PET水解酶的工业应用.
研究的目的:
- 通过蛋白质工程来增强PET水解酶的活性和热稳定性.
- 评估工程酶在PET废物回收中的性能.
主要方法:
- 在Bhr-PETase中使用双基因突变 (H218N/F222M) 重建β6-β7循环以产生Bhr-NMT.
- 将循环重建突变移植到LCC-ICCG和Kubu-PM12中以产生LCC-ICCG-NM和Kubu-PM12-NM.
- 在各种条件下评估酶活性,热稳定性和PET转化率.
主要成果:
- 变种Bhr-NMT表现出高热稳定性 (Tm = 92.9°C) 和87%的活性增加.
- 工程变种Bhr-NMT,LCC-ICCG-NM和Kubu-PM12-NM在高基质度下实现了高的PET转化率 (90-94%).
- Kubu-PM12-NM表现出优越的PET转化 (91%) 即使在减少酶负载的情况下,也表现优于基准.
结论:
- β6-β7循环的蛋白质工程显著提高了PET酶的性能.
- 开发的工程化PET水溶显示出有效的工业PET废物回收利用的巨大潜力.
- 这项研究有助于推进PET塑料循环经济.
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