dCas12a介导的CRISPR干扰用于蓝藻细菌中的多重基因抑制,用于增强异布坦醇和3-甲基-1-布坦醇生产
Hao Xie1,2, Barbara Bourgade1,3, Karin Stensjö1
1Microbial Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden.
Microbial cell factories
|May 13, 2025
概括
我们使用CRISPR干扰 (CRISPRi) 设计了蓝藻细菌,以促进生物燃料生产. 针对特定的基因显著增强异布坦醇和3-甲基-1-布坦醇产量在Synechocystis.
科学领域:
- 合成生物学 合成生物学
- 代谢工程是代谢工程.
- 菌生物技术 菌生物技术
背景情况:
- 菌 (Synechocystis和Synechococcus) 是一个有前途的二氧化碳转化平台,用于燃料和化学品.
- 针对异黄 (IB) 和3-甲基-1-butanol (3M1B) 生产的Synechocystis的代谢工程显示出潜在的但低位数.
- 克里斯普尔干扰 (CRISPRi) 是一种新兴的基因抑制工具,用于提高细胞生产力.
研究的目的:
- 开发和应用CRISPR干扰系统用于Synechocystis中的基因抑制.
- 识别和抑制限制异布坦醇和3-甲基-1-布坦醇生物合成的基因.
- 为了提高生物燃料的生产工程蓝菌.
主要方法:
- 开发了一种dCas12a介导的CRISPRi系统 (CRISPRi-dCas12a),用于针对性地抑制Synechocystis中的基因.
- 设计了一个CRISPR RNA (crRNA) 库,以准15个参与代谢途径的单个基因.
- 将CRISPRi-dCas12a系统集成到一种产生异黄醇/3-甲基-1-butanol的Synechocystis菌株中.
主要成果:
- 使用CRISPRi-dCas12a系统在Synechocystis中实现了高达60%的基因抑制.
- 抑制十个单个基因显著增加了每个细胞的异布坦醇和3-甲基-1-布坦醇产量.
- 在HX106菌株中,对ppc和gltA基因的双重抑制导致异布坦醇和3-甲基-1-布坦醇生产分别增加了2.6倍和14.8倍.
结论:
- 该CRISPRi-dCas12a系统有效地识别竞争的途径,并重定向碳流在Synechocystis.
- 这种系统增强了工程蓝藻细菌中的异芽醇和3-甲基-1-butanol生产.
- 建立了使用CRISPRi用于各种生物制品的全基因组途径探索的基础.
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