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Abstract

An aerobic, mildly acidophilic actinobacterium was isolated from the Ochre Beds bog in Kootenay National Park, Canada. Cells of isolate OB1 were Gram-stain-positive, non-motile, pink- to purple-pigmented filaments. The pH range for growth was pH 3.5–6.5 (optimum pH 5.5), and the temperature range was 13–30°C. The major cellular fatty acids were i-C (28.5 %), i-C (14.6 %) and ai-C (14.3 %), and the major polar lipid was phosphohexose. The major quinone was menaquinone-11 (MK-11), and the peptidoglycan type was A1γ. The DNA G+C content was 70.2 %. Along with growth on complex media including yeast extract, proteose peptone, casamino acids and tryptic soy broth, growth occured on mono- and disaccharides (glucose, sucrose, galactose and xylose) and polysaccharides (starch, gellan, pectin, xylan and alginate). Anaerobic growth was not observed. The cells did not fix atmospheric nitrogen. On the basis of comparative 16S rRNA gene sequence analysis, this isolate belonged to the family , in the suborder of the order . The most closely related species was . However, the 16S rRNA gene sequence identity to this bacterium was low (92.8 %) and there were several chemotaxonomic differences from this species. We therefore propose a novel genus and species, gen. nov., sp. nov., with strain OB1 (=DSM 45618=ATCC BAA-2771) as the type strain.

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2017-03-01
2020-01-21
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