Engineering a Dynamic Controllable Infectivity Switch in Bacteriophage T7.

Engineering a Dynamic Controllable Infectivity Switch in Bacteriophage T7.
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DOI:
10.1021/acssynbio.1c00414
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发表时间:
2022-01-21
影响因子:
4.7
通讯作者:
Raman, Srivatsan
Raman, Srivatsan
中科院分区:
生物学2区
文献类型:
--
作者:
Chitboonthavisuk, Chutikarn;Luo, Chun Huai;Huss, Phil;Fernholz, Mikayla;Raman, Srivatsan

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转录抑制因子在感染细菌宿主的同时,对复杂的噬菌体基因组起着重要的调控作用。在这里,我们研究了如何在噬菌体T7中使用合成抑制物来创造一个动态的、可控的感染性开关。我们通过用配体反应启动子和核糖体结合位点(RBS)的组合来取代早期噬菌体基因组的大区域来设计T7噬菌体,该组合旨在控制噬菌体RNA聚合酶GP1。与野生型相比,带有工程传染性开关的噬菌体在没有被抑制的情况下完全可以存活,这表明可以在不损失适应性的情况下对噬菌体进行改造。最有效的开关使用了TetR反应启动子和减弱的RBS,导致潜伏期增加一倍,抑制时突发大小减少十倍,噬菌体活性能够使用不同的诱导剂浓度进一步调节。我们的研究为一个简单的合成电路如何使用户能够控制噬菌体感染性提供了概念证明。
Transcriptional repressors play an important role in regulating complex phage genomes while infecting a bacterial host. Here, we examine how synthetic repressors can be used in bacteriophage T7 to create a dynamic, controllable infectivity switch. We engineered T7 phage by replacing a large region of the early phage genome with combinations of ligand-responsive promoters and ribosome binding sites (RBS) designed to control the phage RNA polymerase, gp1. Phages with the engineered infectivity switch were fully viable compared to wildtype when not repressed, indicating the phage can be engineered without a loss of fitness. The most effective switch used a TetR-responsive promoter and an attenuated RBS, resulting in a twofold increase in latent period and a tenfold decrease in burst size when repressed, with phage activity capable of being further tuned using different inducer concentrations. Our study provides a proof of concept for how a simple synthetic circuitry can enable user control over phage infectivity.
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