一种基因组缩小的Corynebacterium glutamicum衍生物揭示了与1,2-propanediol生产有关的隐藏途径
Daniel Siebert1,2,3, Erich Glawischnig1,2, Marie-Theres Wirth1
1Microbial Biotechnology, Campus Straubing for Biotechnology and Sustainability, Technical University of Munich, Straubing, Germany.
Microbial cell factories
|February 24, 2024
概括
这项研究对Corynebacterium glutamicum进行了1,2-propanediol (1,2-PDO) 生产的工程设计. 删除甲基醇解毒路径显著提高了1,2-PDO产量,在基因组减少的菌株中,产量增加了56%.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 合成生物学 合成生物学
背景情况:
- 1,2-二醇 (1,2-PDO) 是一种高需求的化学物质,用于化品,食品和药品.
- 目前的1,2-PDO微生物生产需要性能改进,以与石化产品竞争.
- 科里尼细菌 (Corynebacterium glutamicum) 是一个有前途的宿主,用于生物基的1,2-PDO生产.
研究的目的:
- 识别和设计限制Corynebacterium glutamicum中的1,2-propanediol (1,2-PDO) 生产的代谢途径.
- 在基因组缩小的C. glutamicum菌株中提高1,2-PDO的产量.
- 为了阐明C. glutamicum中甲基环氧素解毒路径.
主要方法:
- 设计一个基因组缩小的C. glutamicum PC2菌株,用于生产1,2-PDO.
- 研究副产品的形成,特别是D-乳酸盐,以发现未知的代谢途径.
- 使用代谢学来识别关键代谢物,包括乳酸和菌 (MSH).
- 关闭MSH合成基因 (mshA) 以重定向代谢流向1,2-PDO.
主要成果:
- 工程菌株产生了1,2-PDO,但也分泌了D-乳酸盐,表明了一条未知的途径.
- 代谢学研究显示,甲基醇通过菌醇 (MSH) 排毒,并转化为D-乳酸盐.
- 删除mshA显著提高了1,2-PDO产量的56%,达到0.53 mM1,2-PDO mM葡萄糖-1.1.
- 这一产量代表了C. glutamicum在1,2-PDO生产中报告的最高产量.
结论:
- 减少基因组的菌株对于识别微生物工程中的代谢瓶有价值.
- 这项研究阐明了一种新的甲基醇解毒途径,涉及C. glutamicum中的菌醇 (MSH).
- 禁用这种竞争途径大大提高了1,2-PDO生产效率.
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