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Genome sequencing and analysis of an Escherichia coli phage vB_EcoM-ep3 with a novel lysin, Lysep3

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Abstract

Bacteriophages represent one prospect for preventing and treating multi-drug-resistant Escherichia coli. In this study, we have isolated a novel E. coli-specific bacteriophage and characterised its biological properties. vB_EcoM-ep3 has a broad host range and was able to lyse 9 out of 15 clinical isolates of multi-drug-resistant pathogenic E. coli from chickens. The optimal multiplicity of infection for vB_EcoM-ep3 in host bacteria was 0.01. vB_EcoM-ep3 was thermostable at temperatures below 50 °C for up to 60 min. Electron microscopy demonstrated that vB_EcoM-ep3 belongs to Myoviridae. The vB_EcoM-ep3 genome contained 42,351 pairs of nucleotides with a GC content of 53.35 %. There were 52 predicted open reading frames that appeared to overlap and have a modular structure. Phylogenetic analysis indicates that the closest evolutionary relative to vB_EcoM-ep3 is the previously reported E. coli phage vB_EcoM_ECO1230-10. However, there was no homology between reported E. coli phage lysins and the vB_EcoM-ep3 lysin gene. Lysep3 was 58 % similar to the Pseudomonas phage PPpW-3 lysin despite showing no similarities at the gene sequence level. And Lysep3 has good lysis activity.

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Acknowledgments

The study was supported by funds from the National Key Basic Research Programme of China (No. 2013CB127205). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.

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Authors and Affiliations

  1. College of Veterinary Medicine, Jilin University, Xi’an Road 5333, Changchun, People’s Republic of China

    Meng Lv, Shuang Wang, Guangmou Yan, Changjiang Sun, Xin Feng, Jingmin Gu, Wenyu Han & Liancheng Lei

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  1. Meng Lv
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  2. Shuang Wang
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  3. Guangmou Yan
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  4. Changjiang Sun
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  5. Xin Feng
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  8. Liancheng Lei
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Correspondence to Liancheng Lei.

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Lv, M., Wang, S., Yan, G. et al. Genome sequencing and analysis of an Escherichia coli phage vB_EcoM-ep3 with a novel lysin, Lysep3. Virus Genes 50, 487–497 (2015). https://doi.org/10.1007/s11262-015-1195-8

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  • DOI: https://doi.org/10.1007/s11262-015-1195-8

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