从葡萄糖中高水平生产短链和中链长度的多基酸盐,使用代谢工程大肠杆菌
Hye Eun Yu1,2,3,4, So Young Choi1,2,3,4, Seokho Song1,2,3,4
1Metabolic and Biomolecular Engineering National Research Laboratory, Department of Chemical and Biomolecular Engineering (BK21 four Program), Institute for the BioCentury, KAIST, Daejeon, Republic of Korea.
ChemSusChem
|December 16, 2025
概括
经过代谢工程的大肠杆菌有效地从葡萄糖中产生短链和中链长的多基酸盐 (SCL-MCL-PHAs). 这一突破使得这些多功能生物塑料的可持续,高水平的生产能够用于各种应用.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 聚合物科学 聚合物科学
背景情况:
- 对生物基和可生物降解塑料的日益增长的需求推动了对聚酸酸盐 (PHAs) 的兴趣.
- 短链和中链长度 (SCL-MCL) -PHA共聚合物提供了增强的灵活性和热性能.
- 由于前体供应和聚合效率低下,从廉价的碳来源,如葡萄糖,生产高水平PHA存在挑战.
研究的目的:
- 从葡萄糖中获得高水平的SCL-MCL-PHAs的新生产,使用代谢工程Escherichia coli.
- 为高效的SCL-MCL-PHA合成开发一个模块化代谢工程策略.
主要方法:
- 使用三模块策略的工程大肠杆菌:3-基基-CoA单体通路结构,增强脂肪酸生物合成以供应MCL-脂肪基-CoA,并选广泛基质特异性的PHA合成酶.
- 鉴定了来自Pseudomonas sp.的PHA合成酶 (PhaC) 变体. MBEL 6-19用于SCL和MCL单体的高效聚合.
- 用于PHA生产和分析SCL-MCL-PHA产量和MCL分数的使用料批培养.
主要成果:
- 工程菌株从葡萄糖中实现了高水平的SCL-MCL-PHA生产.
- 一个菌株产生了82.88gL-1PHA与5mol%的MCL分数,而另一个菌株产生了17.35gL-1PHA与19.52mol%的MCL分数.
- 获得的MCL分数 (5-20mol%) 适用于各种聚合物应用,这表明其具有工业相关性.
结论:
- 一种模块化代谢工程方法可以从葡萄糖中有效,可调和和可持续地生产SCL-MCL-PHAs.
- 已识别的PHA合成酶变体是有效聚合SCL和MCL单体的关键.
- 该战略为工业规模的生物塑料生产提供了一个多功能框架.
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