LAUSR

Colwellia sp. Arc7-635, a psychrophilic denitrifying bacterium isolated from Arctic seawater, uses NO3− or NH4+ as the sole nitrogen source to grow at low temperatures. In this article, we describe the complete genome of Colwellia sp. Arc7-635. The genome has one circular chromosome of 4,741,350 bp (38.41 mol% G+C content), consisting of 3841 coding genes, 91 tRNA genes, as well as seven rRNA operons of 16S-23S-5S rRNA, and one operon of 16S-23S-5S-5S rRNA. According to the genomic annotation results, strain Colwellia sp. Arc7-635 encodes a complete denitrifying pathway consisting of genes affiliated with nitrate reductase, nitrite reductase, nitric oxide reductase, and nitrous oxide reductase. Genes affiliated with nitrate reduction to ammonia including nitrate reductases (NapA and NapB) and nitrite reductases (NirA, NirB, and NirD) were also identified. The whole genome sequences of Arc7-635 provide information that is useful for further clarifying nitrogen metabolisms and facilitate its potential applications in the bioremediation of nitrogen pollutions.