Abstract
Flavobacteriaceae, are typically isolated from marine environments.
Polaribacter dokdonensis DSW-5, the type strain
of the species, is a Gram-negative bacterium isolated from the
East Sea of Korea. Whole genome shotgun sequencing was
performed with the HiSeq 2000 platform and paired-end reads
were generated at 188-fold coverage. The sequencing reads
were assembled into two contigs with a total length of 3.08
Mb. The genome sequences of DSW-5 contain 2,776 proteincoding
sequences and 41 RNA genes. Comparison of average
nucleotide identities among six available Polaribacteria genomes
including DSW-5 suggested that the DSW-5 genome
is most similar to that of Polaribacter sp. MED152, which is
a proteorhodopsin-containing marine bacterium. A phylogenomic
analysis of the six Polaribacter strains and 245 Flavobacteriaceae
bacteria confirmed a close relationship of the
genus Polaribacter with Tenacibaculum and Kordia. DSW-5’s
genome has a gene encoding proteorhodopsin and genes encoding
85 enzymes belonging to carbohydrate-active enzyme
families and involved in polysaccharide degradation, which
may play important roles in energy metabolism of the bacterium
in the marine ecosystem. With genes for 238 CAZymes
and 203 peptidases, DSW-5 has a relatively high number of
degrading enzymes for its genome size suggesting its characteristics
as a free-living marine heterotroph.
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