Genomic characterization of SNW-1, a novel prophage of the deep-sea vent chemolithoautotroph Sulfurimonas indica NW79.

The globally widespread genus Sulfurimonas are playing important roles in different habitats, including the deep-sea hydrothermal vents. However, phages infecting Sulfurimonas have never been isolated and characterized to date. In the present study, a novel prophage SNW-1 was identified from Sulfurimonas indica NW79. Whole genome sequencing resulted in a circular, double-stranded DNA molecule of 37,096 bp with a mol% G+C content of 37. The genome includes 64 putative open reading frames, 33 of which code for proteins with predicted functions. Presence of hallmark genes associated with Caudoviricetes and genes involved in lysis and lysogeny indicated that SNW-1 should be a temperate, tailed phage. Phylogenetic and comparative proteomic analyses suggested that Sulfurimonas phage SNW-1 was distinct from other double stranded DNA phages and might represent a new viral genus.