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This study describes the first molecular characterization of a bacteriophage infecting a member of the environmentally important  Sphingomonadaceae  family. Both bacteriophage Lacusarx and its host  Sphingobium  sp. IP1 were isolated from activated sludge from a wastewater treatment plant. Genome sequencing revealed that the phage genes display little similarity to other known phages, despite a remarkable conservation of the synteny in which the functional genes occur among distantly related phages. Phylogenetic analyses confirmed that Lacusarx represents a hitherto undescribed genus of phages. A classical lysis cassette could not be identified in Lacusarx, suggesting that the genes encoding endolysin, holin, and spanin are host-specific and not found in phages infecting other bacteria. The virus harbors 24 tRNA genes corresponding to 18 different amino acids and furthermore has a significantly different codon usage than its host. Proteomic analysis of Lacusarx revealed the protein components of the phage particle. A lysogeny test indicated that Lacusarx is not a temperate phage.

The first characterized phage against a member of the ecologically important sphingomonads reveals high dissimilarity against all other known phages