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Abstract
An orange-coloured bacterial strain, designated 5715S-11T, was isolated from an air sample in Suwon, Republic of Korea. The strain was strictly aerobic, Gram-negative, non-spore-forming, non-flagellated and rod-shaped, frequently forming filaments. Growth of the strain was observed at 4–40 °C (optimum, 30 °C), pH 6.0–8.0 (optimum, pH 7.0) and 0–2 % (w/v) NaCl. Phylogenetically, strain 5715S-11T was shown to be a member of the family Spirosomaceae within the phylum Bacteroidetes. Its closest relatives were Spirosoma linguale LMG 10896T (87.9 % 16S rRNA gene sequence similarity) and Larkinella insperata LMG 22510T (86.2 % 16S rRNA gene sequence similarity). Predominant cellular fatty acids were summed feature 3 (C16 : 1 ω7c and/or iso-C15 : 0 2-OH), C16 : 1 ω5c and iso-C15 : 0. Major polar lipids were phosphatidylethanolamine and unknown aminolipids and polar lipids. On the basis of the evidence from this polyphasic study, strain 5715S-11T is considered to represent a novel species of a new genus, for which the name Rudanella lutea gen. nov., sp. nov. is proposed. The type strain of Rudanella lutea is 5715S-11T (=KACC 12603T =DSM 19387T).
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