在Thermoanaerobacterium aotearoense SCUT27中进行辅助因子工程,以最大限度地提高乙醇产量,并揭示具有高铁素-NAD降解酶活性的酶复合体
Kaiqun Dai1, Chunyun Qu2, Xin Li1
1School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China.
Bioresource technology
|May 3, 2024
概括
在Thermoanaerobacterium aotearoense中进行的基因改造改善了生物燃料生产. 过度表达Bcd-EtfAB复合物解决了因氧化还原不平衡引起的生长问题,从而使基纤维素材料的乙醇产量高.
科学领域:
- 微生物生物技术 微生物生物技术
- 代谢工程是代谢工程.
- 生物燃料的生产生产.
背景情况:
- Thermoanaerobacterium aotearoense SCUT27 是一种关键的微生物,可以从纤维素生物质产生生物燃料.
- 在T. aotearoense中对氧化还原相关基因 (ldh, rex, hfsB) 的基因操纵旨在通过增加NAD的可用性来增强乙醇生产.
- 最初的基因淘汰导致由于细胞内氧化还原失衡和较高的NADH水平而抑制生长.
研究的目的:
- 为了解决转基因T. aotearoense菌株的生长抑制问题.
- 通过优化细胞内氧化还原状态来提高乙醇产量和生产率.
- 研究Bcd-EtfAB复合体在辅因子平衡和生物燃料生产中的作用.
主要方法:
- 乳酸脱酶 (ldh),氧化还原感应转录抑制剂 (rex) 和酶 (hfsB) 的基因淘汰.
- 在改性菌株中,BCd-EtfAB (BCD) 复合物的过度表达.
- 使用红纤维素化物评估乙醇生产的发酵研究.
主要成果:
- 在Δldh/Δrex/ΔhfsB菌株 (PRH-B3) 中,BCD复合物的过度表达恢复了快速生长和高乙醇产量.
- 经过工程改造的PRH-BA菌株 (Δldh/Δrex/ΔhfsB::BCD::adhE) 通过使用红纤维素水解剂实现了高乙醇生产率 (0.45-0.51 g/L/h) 和产量 (0.46-0.53 g/g糖).
- 在低细胞内氧化还原条件下,BCD复合体表现出高铁素-NAD+还原酶活性,有助于细胞稳定.
结论:
- 优化辅因子平衡对于微生物细胞的稳定性和有效的生物燃料生产至关重要.
- BCD复合体在管理细胞内氧化还原状态和增强乙醇发酵方面发挥着至关重要的作用.
- 这项研究为开发工业生物燃料应用改进的微生物菌株提供了有价值的框架.
关键词:
这是一个BCD复合体.生物乙醇 生物乙醇辅助因素工程是指工程中的辅助因素.复氧化状态的复氧化状态.热氧氧细菌 (Thermoanaerobacterium aotearoenseense) 是一种热氧细菌.更多相关视频
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