Abstract
Vibrio alginolyticus is an opportunistic pathogen of animals and humans; its related strains can also produce tetrodotoxin and hemolysins. A new phage, ϕA318, which lysed its host V. alginolyticus with high efficiency, was characterized. The burst size of ϕA318 in V. alginolyticus was 72 PFU/bacterium at an MOI of 1 at room temperature; the plaque size was as large as 5 mm in diameter. Electron microscopy (EM) of the phage particles revealed a 50- to 55-nm isomorphous icosahedral head with a 12-nm non-contractile tail, similar to the T7-like phages of the family Podoviridae. Phylogenetic analysis based on complete sequences of the DNA-directed RNA polymerase gene revealed that ϕA318 had 28-47% amino acid identity to enterobacteria phages T7 and SP6, and other Vibrio phages, and the phylogenetic distance suggested that ϕA318 could be classified as a new T7-like bacteriophage. Nevertheless, several motifs in the ϕA318 phage RNA polymerase were highly conserved, including DFRGR (T7-421 motif), DG (T7-537 motif), PSEKPQDIYGAVS (T7-563 motif), RSMTKKPVMTL PYGS (T7-627 motif), and HDS (T7-811 motif). Genetic analysis indicated that phage ϕA318 is not a thermostable direct hemolysin producer. The results suggest that the MOI should be...Continue Reading
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