基因工程 Bacillus subtilis KH2 有效生产的聚-γ-谷氨酸从谷氨酸废物基于转录基因的转录基因学
Yuan Tian1, Ruixin Hu2, Ruijie Zhang3
1Institute of Microbiology, Heilongjiang Academy of Sciences, Harbin, 150010, Heilongjiang, China; College of Food Science, Northeast Agricultural University, Harbin, 150030, Heilongjiang, China.
International journal of biological macromolecules
|December 17, 2025
概括
谷氨酸废液抑制了Bacillus subtilis KH2.2中聚-γ-谷氨酸的产生. 代谢工程确定了克服抑制的关键基因,达到32.24g/L的高γ-PGA标位.
科学领域:
- 生物技术是生物技术.
- 工业微生物学 工业微生物学
- 代谢工程是代谢工程.
背景情况:
- 谷氨酸废液 (GWL) 是单谷氨酸生产的副产品.
- 使用GWL用于聚-γ-胺酸 (γ-PGA) 生产提供了一种经济和可持续的方法.
- 了解GWL对γ-PGA生产者的抑制作用对于具有成本效益的工业应用至关重要.
研究的目的:
- 在γ-PGA发酵过程中研究GWL在Bacillus subtilis KH2上的抑制机制.
- 确定增强GWL的γ-PGA生产的遗传标.
- 使用工业废物提高γ-PGA生物合成的效率.
主要方法:
- 对比转录组学分析B. subtilis KH2暴露于GWL中的基因表达变化.
- 基因过度表达实验验验证特定基因在γ-PGA生产中的作用.
- 代谢工程策略包括基因淘汰 (Δres1, Δres2, ΔgudB, ΔrocG) 以提高γ-PGA产量.
- 摇瓶发酵,以评估γ-PGA的生产性能.
主要成果:
- 暴露于GWL导致了γ-PGA合成基因的下调和糖解和谷氨酸前体合成基因的上调.
- 鉴定出swrA基因是GWL介导的γ-PGA生物合成抑制中的关键调节者.
- 对B. subtilis KH2的代谢工程导致γ-PGA标位为32.24 g/L,酸盐消费率增加了59.37%.
结论:
- 这项研究阐明了GWL对B. subtilis KH2的抑制作用,为潜在的分子机制提供了洞察力.
- 已确定的代谢工程目标和策略使得从工业废物中提升了g-PGA的生产.
- 细菌细菌KH2证明了使用GWL进行具有成本效益和可持续的γ-PGA制造的巨大潜力.
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