在Yarrowia lipolytica中,设计的非正规的还原性TCA通路驱动了高产酸生物合成
Huilin Tao1, Aomei Hao1, Xiaoyue Pan1
1State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, PR China.
Metabolic engineering
|November 8, 2025
概括
我们在酵母中设计了一种新的非正规的还原性TCA通路,以克服酸 (SA) 生产中的氧化还原限制. 这种方法显著提高了从葡萄糖,基纤维素解液和甘油中获得的SA产量.
科学领域:
- 代谢工程是代谢工程.
- 合成生物学 合成生物学
- 生物技术是生物技术.
背景情况:
- 减少型三碳酸 (rTCA) 循环对于微生物酸 (SA) 生产至关重要.
- 在rTCA周期内发生的氧还原失衡限制SA收益率.
- 需要工程策略来克服这些限制,以实现高效的C4-二碳酸生物合成.
研究的目的:
- 在Yarrowia lipolytica.中设计一个非正规的还原性TCA (Nc-rTCA) 途径.
- 为了将SA合成与原生rTCA循环的NADH依赖性分离.
- 为了提高酸生产效率和产量.
主要方法:
- 用工程级联 (阿斯巴胺转移酶,阿斯巴氨酶,谷氨酸脱酶) 替代NADH依赖的酸转化为烟酸盐.
- 使用NADPH依赖模块绕过氧化还原约束.
- 进行了代谢优化,以尽量减少副产品的形成.
主要成果:
- 使用工程途径实现了1.28倍的烟酸标位增加.
- 开发出的Ncr12菌株具有98.16g/L的SA标位和0.91g/g的葡萄糖产量.
- 显示出工业潜力,其高SA标位来自基纤维素化物 (74.34 g/L) 和糖 (117.74 g/L).
结论:
- Nc-rTCA路径有效地解决了基于rTCA的工程中的氧化还原失衡问题.
- 这项研究建立了一个可扩展的平台,用于生物基C4-二碳酸生产.
- 该工程途径为可持续的酸制造提供了一个有前途的解决方案.
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