Abstract
The genus Kordia is one of many genera affiliated with the family Flavobacteriaceae of the phylum Bacteroidetes, well known for its degradation of high molecular weight organic matters. The genus Kordia currently comprises eight species, type strains of which have been isolated from a diverse range of marine environments. As of this report, four genome sequences have been submitted for cultured strains of Kordia, but none are complete nor have they been analyzed comprehensively. In this study, we report the complete genome of Kordia antarctica IMCC3317T, isolated from coastal seawater off the Antarctic Peninsula. The complete genome of IMCC3317T consists of a single circular chromosome with 5.5 Mbp and a 33.2 mol% of G+C DNA content. The IMCC3317T genome showed features typical of chemoheterotrophic marine bacteria and similar to other Kordia genomes, such as complete gene sets for the Embden–Meyerhof–Parnas glycolysis pathway, tricarboxylic acid cycle and oxidative phosphorylation. The genome also encoded many carbohydrate-active enzymes, some of which were clustered into approximately seven polysaccharide utilization loci, thereby demonstrating the potential for polysaccharide utilization. Finally, a nosZ gene encoding nitrous oxide reductase, an enzyme that catalyzes the reduction of N2O to N2 gas, was also unique to the IMCC3317T genome.
Highlights
The phylum Bacteroidetes is among the most abundant phyla in the ocean, accounting for an average of approximately 10% of marine surface bacterioplankton cells[1,2]
The genus Kordia belonging to the family Flavobacteriaceae was proposed by Sohn et al.[10] and currently comprises eight species: K. ulvae[11], K. algicida[10], K. aquimaris[12], K. zhangzhouensis[13], K. jejudonensis[14], K. periserrulae[15], K. zosterae[16], and K. antarctica[17]
Comparison of 16S rRNA gene sequences with other type strains of the genus Kordia showed that strain IMCC3317T is most closely related to K. zosterae ZO2-23T (97.7%, sequence similarity), followed by K. ulvae SC2T (97.0%), K. jejudonensis SSK33T (96.5%), K. algicida OT-1T (96.6%), and K. periserrulae IMCC1412T (96.1%)
Summary
The phylum Bacteroidetes is among the most abundant phyla in the ocean, accounting for an average of approximately 10% of marine surface bacterioplankton cells[1,2]. The genus Kordia belonging to the family Flavobacteriaceae was proposed by Sohn et al.[10] and currently comprises eight species: K. ulvae[11], K. algicida[10], K. aquimaris[12], K. zhangzhouensis[13], K. jejudonensis[14], K. periserrulae[15], K. zosterae[16], and K. antarctica[17]. Whole-genome sequences of four strains of Kordia species are publicly available: K. algicida, K. zhangzhouensis, K. jejudonensis, and K. periserrulae. A high-quality, metagenome-assembled genome belonging to the genus Kordia was obtained by sequencing a non-axenic culture of the marine diatom Skeletonema marinoi[23]. Comparative analyses indicated that the I MCC3317T genome contains a nosZ gene encoding nitrous oxide ( N2O), unique to this strain among the Kordia species
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