Complete genome sequence of bacteriophage P2559Y, a marine phage that infects Croceibacter atlanticus HTCC2559.

The genus Croceibacter of the family Flavobacteriaceae represents a ubiquitous component of marine bacterioplankton, and is known to be involved in the interaction with phytoplankton. Here, we report the isolation and genome sequencing of a lytic siphovirus P2559Y that infects Croceibacter atlanticus HTCC2559, the type strain of the genus Croceibacter. The complete genome of P2559Y was 43,153bp in length, with a GC content of 38.9%. Functional annotation of 51 genes predicted in the genome showed that the P2559Y genome had a modular architecture. Comparison to the genome of P2559S, another phage that infects the same host strain, revealed an interesting feature in the genetic diversity of phages infecting the genus Croceibacter. The two phage genomes had a synteny in the structure module and shared many structural genes, while little similarity was found in the DNA replication/metabolism module.