非规范性氨基酸作为以细菌为基础的输送系统中蛋白质调节的prophage诱导剂
Hongfang Liu1, Sijia Shen2, Qi Xu1
1State Key Laboratory of Metabolism and Regulation in Complex Organisms, Hubei Key Laboratory of Cell Homeostasis, College of Life Science, TaiKang Center for Life and Medical Sciences, Wuhan University, Wuhan, China.
工程细菌通过使用非正规氨基酸 (ncAAs) 作为新型诱导剂提供治疗性蛋白质. 该系统允许对多种蛋白质进行独立控制,用于组合治疗.
科学领域:
- 合成生物学 合成生物学
- 基因工程是一种基因工程.
- 分子生物学分子生物学
背景情况:
- 基因工程细菌对药物输送有希望.
- 在基于细菌的系统中调节多种蛋白质药物是具有挑战性的.
- 现有的方法需要复杂的基因工程.
研究的目的:
- 开发一种新的策略,用于使用非正规氨基酸 (ncAAs) 在基于细菌的输送系统中独立调节蛋白质.
- 为了设计一个兰巴菌素素系统,用于双模式的蛋白质输送.
- 通过in situ蛋白调节来证明组合疗法的潜力.
主要方法:
- 使用特定氨基酸-tRNA合成酶/tRNA对 (MbPylRS-349F/tRNA Pyl 和 AfpIFRS/tRNA Tyr) 的遗传密码扩展技术.
- 工程化Cro蛋白变体 (Cro-K8AlocK和Cro-F14pIF) 用于纳入ncAAs (AlocK和pIF).
- 在工程Escherichia coli lysogens中验证了细菌溶解和记者蛋白 (mNeonGreen,mCherry) 表达的正交诱导.
主要成果:
- 已成功将AlocK和pIF纳入Cro蛋白变体,从而实现功能性蛋白质调节.
- 使用 AlocK 和 pIF 在混合 lysogen 系统中展示了细菌溶解和记者基因释放/表达的独立诱导.
- 证实MbPylRS-349F/tRNA Pyl和AfpIFRS/tRNA Tyr对的相互正交性,用于不同的ncAA诱导.
结论:
- 开发了一种基于细菌的多功能输送系统,可实现两种模式的蛋白质输送和通过ncAAs独立调节多种蛋白质.
- 这一策略为原位蛋白调节提供了一种新的方法,并对开发先进的组合疗法产生重大影响.
- 该方法需要最小的基因工程,可以适应其他菌体系统和菌体生物学研究.
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