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
中科院分区:
文献类型:
--
作者:
Chitboonthavisuk, Chutikarn;Luo, Chun Huai;Huss, Phil;Fernholz, Mikayla;Raman, Srivatsan
关键词:
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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发表时间:
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通讯作者:
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