通过Klebsiella pneumoniae产生的二氧化二二酸盐的生产
Qinghui Wang1, Weiyan Jiang2, Yaoyu Cai2
1Lab of Biorefinery, Shanghai Advanced Research Institute, Chinese Academy of Sciences, No. 99 Haike Road, Pudong, Shanghai 201210, People's Republic of China; Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin 150030, People's Republic of China.
Enzyme and microbial technology
|October 22, 2023
概括
研究人员发现了一种新途径,用于生产生物降解聚乙烯的关键化学物质2-氧化. 这项研究揭示了如何设计Klebsiella pneumoniae以有效合成这种有价值的化合物.
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:
- 2-氧化二酸盐是可生物降解聚的有价值的前体.
- 自然生产的2-氧化二酸盐是有限的,在Lactococcus lactis中观察到的产量很低.
- 克莱布西拉肺炎 ΔbudAΔldhA (Kp ΔbudAΔldhA) 之前已被确立为一个2 - 异酸盐的生产者.
研究的目的:
- 为了确定和阐明Klebsiella pneumoniae中2-氧异二酸盐合成的代谢途径.
- 调查特定酶在2 - 基托异酸盐转化为2 - 氧异酸盐中的作用.
- 为了改造Klebsiella pneumoniae以提高2-氧化酸盐的生产.
主要方法:
- 对具有向基因淘汰 (ΔbudA, ΔldhA, ΔilvD) 的Klebsiella pneumoniae菌株进行代谢分析.
- 酶活性测定用于确定番酸还原酶异酶 (PanE,PanE2,IlvC) 的动力参数和辅因子特异性.
- 基因工程通过基因过度表达和淘汰来优化2-二二酸盐的生产.
- 料批发发酵,以评估工程菌株的生产性能.
主要成果:
- 鉴定出2-氧化二烯酸盐是Kp ΔbudAΔldhA产生的代谢物,源自2-氧化二烯酸盐.
- 肯托酸减少酶异酶PanE,PanE2和IlvC被证实具有2 - 基因酸减少酶活性.
- 过度表达panE,panE2或ilvC显著增强了2-氧化二酸盐的产生.
- 一个食批发发酵的产量达到14.41 g/L的2-基异酸盐使用工程Kp ΔbudAΔldhA-panE菌株.
结论:
- 这项研究揭示了Klebsiella pneumoniae中2-氧化酸盐的新生物合成途径,其介导由基酸减少酶异酶.
- 通过过度表达特定的还原酶基因,工程Klebsiella pneumoniae提供了一种有前途的策略,用于有效的微生物生产2-氧化酸盐.
- 开发的微生物菌株和发酵过程表明,可用于生物降解聚应用的2-氧化酸盐的可持续生产有潜力.
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