OptoLacI:光遗传工程制造的乳糖运抑制剂,LacI对光有反应,而不是IPTG
Meizi Liu1,2,3, Zuhui Li1,2,4, Jianfeng Huang1,2
1Key Laboratory of Engineering Biology for Low-Carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China.
Nucleic acids research
|June 11, 2024
概括
研究人员使用工程乳糖抑制蛋白 (OptoLacI) 在大肠杆菌中开发了光控制的基因表达系统. 这些光遗传工具提供了对生物过程的精确控制,超越了像IPTG这样的传统化学诱导剂.
科学领域:
- 合成生物学 合成生物学
- 视觉遗传学 视觉遗传学
- 分子工程是分子工程.
背景情况:
- 光遗传学为生物过程提供可调节,可逆和低毒性控制.
- 大肠杆菌中的乳糖操作系统由乳糖抑制蛋白 (LacI) 和化学诱导剂 (如IPTG) 调节.
- 现有的感应系统缺乏基于光的方法所提供的微调控制.
研究的目的:
- 设计LacI抑制剂的响应光的变体,用于对大肠杆菌中基因表达的光遗传控制.
- 开发新的光控制基因表达系统 (OptoE.coliLight和OptoE.coliDark),消除了对化学诱导剂的需求.
- 为了证明这些系统在蛋白质生产和代谢流量控制方面的有效性.
主要方法:
- 利用来自阿维纳树种光热素的光-氧-电压2 (LOV2) 域 1.
- 将LacI工程转化为对光敏感的变种 (OptoLacIL和OptoLacID).
- 构建和应用OptoE.coliLight和OptoE.coliDark系统来调节基因表达.
主要成果:
- OptoLacIL和OptoLacID变种直接响应光和黑暗,取代了IPTG.
- 开发了具有优越可控性的双功能基因表达系统 (OptoE.coliLight和OptoE.coliDark).
- 暗中诱导的1,3-二醇 (1,3-PDO) 和欧戈氨酸的产量分别超过了IPTG诱导的水平110%和60%.
结论:
- OptoLacI变种为基于光的控制大肠杆菌基因表达提供了一个新的平台.
- 开发的光遗传系统为蛋白质生产和代谢工程提供了更好的控制和效率.
- 这一进步对光遗传蛋白质工程和各种生物技术应用具有重大潜力.
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