一种系统的过度表达方法揭示了本地标,以增加Synechocystis sp.中的squalene产量. 在PCC 6803中
Anna T Germann1, Andreas Nakielski1, Maximilian Dietsch1
1Institute for Synthetic Microbiology, Department of Biology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
Frontiers in plant science
|June 16, 2023
概括
菌可以被改造为产生素,这是固醇的关键前体. 在Synechocystis sp.中过度表达特定基因. PCC 6803显著提高了烯的产量,为三烯合成建立了一个可持续的平台.
科学领域:
- 合成生物学 合成生物学
- 代谢工程是代谢工程.
- 微生物生物技术 微生物生物技术
背景情况:
- 菌,比如Synechocystis sp. 这样的. PCC 6803,因其在生产诸如烯等有价值化合物的潜力而得到认可.
- 斯卡烯是固醇的关键前体和三类化合物的中间体,这些化合物具有重要的应用.
- 了解本地代谢途径对于优化工程菌株生产至关重要.
研究的目的:
- 系统地调查本地基因过度表达对Synechocystis sp.中素生产的影响. 这是PCC 6803.
- 为了确定中枢碳代谢和MEP途径中的关键基因,这些基因可以增强烯生物合成.
- 建立一个高收益,可持续的微生物平台,用于三烯生产.
主要方法:
- 利用基于约束的代谢模型进行代谢流动的in silico分析.
- 采用了一种系统的基因过度表达策略,用于烯-烯循环酶淘汰菌株 (Δshc).
- 综合过度表达的基因在拉姆诺斯诱导促进剂 (Prha) 下进行控制表达.
主要成果:
- 在分析预测了Calvin-Benson-Bassham和酸通道的流量增加,并在Δshc突变体中降低了糖解.
- 过度表达MEP通路基因 (ispH, ispE, idi) 和中央碳代谢基因 (Gap2, Tpi, PyrK) 对烯生产产生了积极影响.
- 在Synechocystis Δshc中,氨酸合成酶基因 (sqs) 的过度表达,为氨酸达到13.72毫克L-1的记录标位.
结论:
- 工程设计的Synechocystis sp. 这种植物. PCC 6803 显示出作为一种可持续的烯和三烯生产平台的巨大潜力.
- 针对特定代谢基因的过度表达可以有效地增强有价值的异oprenoids 的生物合成.
- 这项研究为进一步优化和扩大微生物烯制造提供了基础.
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