在大肠杆菌中从糖醇中产生多酸的代谢工程策略
Shivangi Mishra1, Ke Xu1, Madeline K Kuckuk1
1Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI, 53706, USA.
Metabolic engineering
|August 24, 2025
概括
从廉价的甘油中制造出多功能生物塑料的E大肠杆菌. 这一进步为PHO生产提供了可持续的途径,具有潜在的工业和生物医学应用.
科学领域:
- 生物技术
- 代谢工程
- 聚合物科学
背景情况:
- 聚3-酸 (PHO) 是一种中长链的多酸 (PHA),具有低结晶度和高延长度等理想性质.
- PHO的特性使其适用于各种工业和生物医学应用,与脆弱的短链PHAs形成鲜明对比.
- 有效和可持续的生产方法对于实现PHO的潜力至关重要.
研究的目的:
- 使用可再生原料糖醇制造大肠杆菌生产PHO.
- 为了优化八甲基-CoA前体的合成代谢途径.
- 识别和整合用于工程化大肠杆菌中高效PHO积累的关键基因.
主要方法:
- 设计大肠杆菌中的脂肪酸合成和β-氧化途径.
- 表达 (R) 特定的乙烯基-CoA酸酶 (phaJ) 和PHA合成酶 (phaC) 基因.
- 来自其他细菌物种的同类基因 (phaJ,phaC,fadD) 的生物探测和整合.
- 使用C8特异性化酶突变体 (CpFatB1.2-M4-287) 进行八度酸生产.
- 用于PHO积累的料批发发酵.
主要成果:
- 工程化大肠杆菌菌株NHL18从糖醇中产生3.69g/L的八度酸.
- 工程化大肠杆菌菌株SM23累积了15%的细胞干重PHO.
- 在料批发发酵中,从糖醇中获得了1.54g/L的最终PHO标位.
- 来自Pseudomonas物种的特定phaJ,phaC和fadD基因的组合增强了八酸盐的PHO产生.
结论:
- 大肠杆菌的新陈代谢工程使得从糖醇中有效地产生PHO.
- 这些工程菌株显示出可持续生物塑料合成的可行途径.
- 这项研究为进一步优化用于工业应用的PHO生产提供了基础.
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