Results of studying the novel virulent phage phiPMG1 active on Pseudomonas aeruginosa are presented. It is shown that phiPMG1 exhibits significant homology and the similarity in the overall structure with the genome of a temperate phage converts D3. Phage phiPMG1 differs from D3 in that it fails to stably lysogenize bacteria and can grow on strains carrying plasmids that cause growth inhibition of phage D3 and some other phages. This significantly diminishes the probability of horizontal gene transfer with phage phiPMG1 and suggests the possible employment of this phage in phage therapy. A comparison of phages phiPMG1 and D3 structures of genomes in demonstrated not only high homology of 65 genes, but also the presence of 16 genes in the phiPMG1 genome that were not included in the in NCBI database. Apparently, the evolution of genomes in phages of this species is mostly associated with migrations into other species of bacteria, and recombinations with phages of other species (for example, F116). A detailed analysis of structure of one region genomes, which significant nonhomology for the three D3-like phages (D3, phiPMG1 and PAJU2), revealed that the phiPMG1 genome possible closest to a hypothetical genome of ancestral phage of this species.
Russian Journal of Genetics – Springer Journals
Published: Nov 1, 2012
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