Isolation and characterization of a novel Enterococcus faecalis bacteriophage φEF24C as a therapeutic candidate

Jumpei Uchiyama, Mohammad Rashel, Yoshihiro Maeda, Iyo Takemura, Shigeyoshi Sugihara, Kazue Akechi, Asako Muraoka, Hiroshi Wakiguchi, Shigenobu Matsuzaki

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

Abstract

Vancomycin-resistant Enterococcus faecalis (VRE) has become a significant threat in nosocomial settings. Bacteriophage (phage) therapy is frequently proposed as a potential alternative therapy for infections caused by this bacterium. To search for candidate therapeutic phages against Enterococcus faecalis infections, 30 Enterococcus faecalis phages were isolated from the environment. One of these, virulent phage φEF24C, which has a broad host range, was selected for analysis. The plaque-forming ability of φEF24C was virtually unaffected by differences in the clinical host strains. Furthermore, the phage had a shorter latent period and a larger burst size than ordinary tailed phages, indicating that φEF24C has effective lytic activity against many Enterococcus faecalis strains, including VRE. Morphological and genomic analyses revealed that φEF24C is a large myovirus (classified as family Myoviridae morphotype A1) with a linear double-stranded DNA genome of c. 143 kbp. Analyses of the N-terminal amino acid sequences of the virion proteins, together with the morphology and the genome size, speculated that φEF24C is closely related to other myoviruses of Gram-positive bacteria that have been used experimentally or practically for therapy or prophylaxis. Considering these results, φEF24C may be a potential candidate therapeutic phage against Enterococcus faecalis infections.

Original languageEnglish
Pages (from-to)200-206
Number of pages7
JournalFEMS Microbiology Letters
Volume278
Issue number2
DOIs
Publication statusPublished - Jan 2008
Externally publishedYes

Keywords

  • Bacteriophage
  • Bacteriophage therapy
  • Enterococcus faecalis

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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