ArticleArchives of virology2026
Characterization and genomic analysis of vB_CoeS_P1, a novel marine bacteriophage, and definition of the new family Estoviridae.
Article in Archives of virology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
A novel bacteriophage vB_CoeS_P1, isolated in the surface waters of the Cochin estuary of Kerala, India, was identified as phage known to infect Vibro spp_SR1_COC. Transmission electron microscopy analysis revealed that the phage had a myovirus morphotype with an icosahedral head and a long contractile tail. Characterization experiments showed that the phage was stable across a temperature range of 4 °C to 60 °C, a pH of 4 to 12, and a salinity range of 0.5% to 16%. One-step growth curve analysis revealed a burst size of 40 PFU/Cell and a latent period of 20 min. The phage contains a double-stranded DNA with 136,927 bp and 34.93% GC content. The NCBI BLASTn analysis reveals that vB_CoeS_P1 exhibits very low sequence similarity (1% query coverage and 77.82% identity) with Vb_VpaM_R16F (OP793884.1). It has 265 predicted ORFs, among them 57 have putative functions with no tRNA, antibiotic encoding genes, and resistance encoding genes. Three putative auxiliary metabolic genes were identified, encoding pyrophosphohydrolase enzyme (ORF 75), PhoH-like phosphate starvation-inducible (ORF 34), and Endonuclease V N-glycosylase UV repair enzyme (ORF 248). Phylogenetic analysis of conversed genes revealed that vB_CoeS_P1 is clustered with Vb_VpaM_R16F but diverged into a distinct clade. Further, whole genome proteomic tree analysis, comparative genome analysis using average nucleotide identity (ANI), and network analysis confirmed that vB_CoeS_P1 contains a unique genetic and evolutionary architecture. These findings support the proposal of a new bacteriophage family Estoviridae, within the Caudoviricetes class.
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