Characterization of the morphology and genome of an Escherichia coli podovirus

Characterization of the morphology and genome of an Escherichia coli podovirus Escherichia coli is an important opportunistic pathogen. It can cause sepsis and severe infection. The application of lytic bacteriophages to treat infectious diseases is an alternative to antibiotics. A lytic Escherichia coli phage, designated IME-EC2, was isolated from hospital sewage. Transmission electron microscopy revealed that IME-EC2 to be a member of the family Podoviridae . It had a 60-nm head and a 15-nm tail. Here, we present the complete genome sequence of this phage, which consists of 41,510 bp with an overall G+C content of 59.2 %. A total of 60 coding sequences (CDS) were identified, and the phage genome does not contain any tRNA genes. Forty percent of the unknown CDSs are unique to IME-EC2. This phage does not show significant similarity to other phages at the DNA level, which suggests that IME-EC2 could be a novel phage. One of the unique features identified in the IME-EC2 genome was a gene coding for a putative colanic-acid-degrading protein, which could allow the phage to degrade bacterial capsule and biofilms. Another unique feature is that IME-EC2 does not contain a terminase small subunit, which suggests that this phage may have a unique packaging mechanism. The present work provides novel information on phages and shows that this lytic phage or its products could be exploited to destroy bacterial biofilms and pathogenic E. coli . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Virology Springer Journals
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Publisher
Springer Vienna
Copyright
Copyright © 2014 by Springer-Verlag Wien
Subject
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
ISSN
0304-8608
eISSN
1432-8798
D.O.I.
10.1007/s00705-014-2189-x
Publisher site
See Article on Publisher Site

Abstract

Escherichia coli is an important opportunistic pathogen. It can cause sepsis and severe infection. The application of lytic bacteriophages to treat infectious diseases is an alternative to antibiotics. A lytic Escherichia coli phage, designated IME-EC2, was isolated from hospital sewage. Transmission electron microscopy revealed that IME-EC2 to be a member of the family Podoviridae . It had a 60-nm head and a 15-nm tail. Here, we present the complete genome sequence of this phage, which consists of 41,510 bp with an overall G+C content of 59.2 %. A total of 60 coding sequences (CDS) were identified, and the phage genome does not contain any tRNA genes. Forty percent of the unknown CDSs are unique to IME-EC2. This phage does not show significant similarity to other phages at the DNA level, which suggests that IME-EC2 could be a novel phage. One of the unique features identified in the IME-EC2 genome was a gene coding for a putative colanic-acid-degrading protein, which could allow the phage to degrade bacterial capsule and biofilms. Another unique feature is that IME-EC2 does not contain a terminase small subunit, which suggests that this phage may have a unique packaging mechanism. The present work provides novel information on phages and shows that this lytic phage or its products could be exploited to destroy bacterial biofilms and pathogenic E. coli .

Journal

Archives of VirologySpringer Journals

Published: Dec 1, 2014

References

  • What does structure tell us about virus evolution?
    Bamford, DH; Grimes, JM; Stuart, DI
  • The structure of a LysM domain from E. coli membrane-bound lytic murein transglycosylase D (MltD)
    Bateman, A; Bycroft, M
  • The terminase enzyme from bacteriophage lambda: a DNA-packaging machine
    Catalano, C
  • Bacteriophage and associated polysaccharide depolymerases––novel tools for study of bacterial biofilms
    Hughes, K; Sutherland, I; Clark, J; Jones, M
  • Bacteriophage T4 genome
    Miller, ES; Kutter, E; Mosig, G; Arisaka, F; Kunisawa, T; Rüger, W
  • BTXpred: prediction of bacterial toxins
    Saha, S; Raghava, GP
  • Circular genome visualization and exploration using CGView
    Stothard, P; Wishart, DS

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