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Characterization of a bacteriophage, vB_Eco4M-7, that effectively infects many Escherichia coli O157 strains
- Source :
- Scientific Reports, Vol 10, Iss 1, Pp 1-14 (2020), Scientific Reports
- Publication Year :
- 2020
- Publisher :
- Nature Publishing Group, 2020.
-
Abstract
- The characterization of a recently isolated bacteriophage, vB_Eco4M-7, which effectively infects many, though not all, Escherichia coli O157 strains, is presented. The genome of this phage comprises double-stranded DNA, 68,084 bp in length, with a GC content of 46.2%. It contains 96 putative open reading frames (ORFs). Among them, the putative functions of only 35 ORFs were predicted (36.5%), whereas 61 ORFs (63.5%) were classified as hypothetical proteins. The genome of phage vB_Eco4M-7 does not contain genes coding for integrase, recombinase, repressors or excisionase, which are the main markers of temperate viruses. Therefore, we conclude that phage vB_Eco4M-7 should be considered a lytic virus. This was confirmed by monitoring phage lytic development by a one-step growth experiment. Moreover, the phage forms relatively small uniform plaques (1 mm diameter) with no properties of lysogenization. Electron microscopic analyses indicated that vB_Eco4M-7 belongs to the Myoviridae family. Based on mass spectrometric analyses, including the fragmentation pattern of unique peptides, 33 phage vB_Eco4M-7 proteins were assigned to annotated open reading frames. Importantly, genome analysis suggested that this E. coli phage is free of toxins and other virulence factors. In addition, a similar, previously reported but uncharacterized bacteriophage, ECML-117, was also investigated, and this phage exhibited properties similar to vB_Eco4M-7. Our results indicate that both studied phages are potential candidates for phage therapy and/or food protection against Shiga toxin-producing E. coli, as the majority of these strains belong to the O157 serotype.
- Subjects :
- 0301 basic medicine
Phage therapy
medicine.medical_treatment
viruses
030106 microbiology
Phage biology
lcsh:Medicine
Myoviridae
Escherichia coli O157
medicine.disease_cause
Article
Bacteriophage
Open Reading Frames
Viral Proteins
03 medical and health sciences
medicine
Bacteriophages
ORFS
lcsh:Science
Escherichia coli
Genetics
Multidisciplinary
biology
lcsh:R
biology.organism_classification
Integrase
030104 developmental biology
Lytic cycle
biology.protein
Excisionase
lcsh:Q
Subjects
Details
- Language :
- English
- ISSN :
- 20452322
- Volume :
- 10
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....c02304dd9b031cc2efce6fa4ce2f8270