在替代碳来源上Clostridium thermocellumATCC 27405的适应性进化导致发酵概况发生变化
Steve R Daley1, Samantha Kirby1, Richard Sparling1
1Department of Microbiology, University of Manitoba, Winnipeg, MB, Canada.
Canadian journal of microbiology
|June 4, 2024
概括
克洛斯特里热细胞适应了新的糖,增加了从葡萄糖和酸醇中获得的生物乙醇产量. 果糖适应意外减少了酸盐的产生,表明了新陈代谢调节的洞察力.
科学领域:
- 微生物学 微生物学
- 代谢工程是代谢工程.
- 合成生物学 合成生物学
背景情况:
- 热细胞菌 (Clostridium thermocellum) 是巩固生物处理的关键微生物,能够进行纤维素水解和生物乙醇发酵.
- 了解其代谢途径对于优化从纤维素生物质中生产乙醇至关重要.
- 目前的研究经常使用像Avicel和蜂菌这样的模型基质.
研究的目的:
- 通过对替代碳来源的适应性实验室进化来提高Clostridium热细胞中的乙醇产量.
- 研究适应葡萄糖,果糖和的代谢转变和调控影响.
- 确定提高生物乙醇生产效率的策略.
主要方法:
- 适应性实验室进化的Clostridium热细胞 DSM 1237.
- 对葡萄糖,果糖和酸醇进行生长和发酵分析.
- 发酵最终产品的量化,包括乙醇和甲酸盐.
主要成果:
- 在葡萄糖的适应性增长上,乙醇产量增加了约1毫米/毫米的葡萄糖等价物.
- 索尔比托的适应生长使乙醇产量增加了约2mM/mM的葡萄糖等价物,这归因于碳源的减少状态.
- 果糖适应并没有增加乙醇产量,但消除了酸盐生产,这表明监管控制.
结论:
- 适应性实验室进化可以通过利用特定的碳来源来提高Clostridium热细胞中的生物乙醇产量.
- 碳源的减少状态显著影响乙醇产量.
- 热细胞菌中的果糖代谢对格式生产具有监管影响,为代谢工程提供了潜在的目标.
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