期刊
NATURE MICROBIOLOGY
卷 5, 期 1, 页码 48-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41564-019-0612-5
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资金
- Marsden Fund from the Royal Society of New Zealand
- University of Otago Research Grant
- University of Otago Doctoral Scholarship
- NeSI
- Ministry of Business, Innovation and Employment's Research Infrastructure programme
CRISPR-Cas systems provide bacteria with adaptive immunity against bacteriophages(1). However, DNA modification(2,3), the production of anti-CRISPR proteins(4,5) and potentially other strategies enable phages to evade CRISPR-Cas. Here, we discovered a Serratia jumbo phage that evades type I CRISPR-Cas systems, but is sensitive to type III immunity. Jumbo phage infection resulted in a nucleus-like structure enclosed by a proteinaceous phage shell-a phenomenon only reported recently for distantly related Pseudomonas phages(6,7). All three native CRISPR-Cas complexes in Serratia-type I-E, I-F and III-A-were spatially excluded from the phage nucleus and phage DNA was not targeted. However, the type III-A system still arrested jumbo phage infection by targeting phage RNA in the cytoplasm in a process requiring Cas7, Cas10 and an accessory nuclease. Type III, but not type I, systems frequently targeted nucleus-forming jumbo phages that were identified in global viral sequence datasets. The ability to recognize jumbo phage RNA and elicit immunity probably contributes to the presence of both RNA- and DNA-targeting CRISPR-Cas systems in many bacteria(1,8). Together, our results support the model that jumbo phage nucleus-like compartments serve as a barrier to DNA-targeting, but not RNA-targeting, defences, and that this phenomenon is widespread among jumbo phages.
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