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Rudanella lutea gen. nov., sp. nov., isolated from an air sample in Korea

¹ Applied Microbiology Division, National Institute of Agricultural Science and Technology, Rural Development Administration, Suwon 441-707, Republic of Korea
² Korean Agricultural Culture Collection (KACC), Microbial Genetics Division, National Institute of Agricultural Biotechnology, Rural Development Administration, Suwon 441-707, Republic of Korea
³ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstrasse 7b, D-38124 Braunschweig, Germany

Correspondence
Soon-Wo Kwon
swkwon{at}rda.go.kr

An orange-coloured bacterial strain, designated 5715S-11^T, 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-11^T was shown to be a member of the family Spirosomaceae within the phylum Bacteroidetes. Its closest relatives were Spirosoma linguale LMG 10896^T (87.9 % 16S rRNA gene sequence similarity) and Larkinella insperata LMG 22510^T (86.2 % 16S rRNA gene sequence similarity). Predominant cellular fatty acids were summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH), C_{16 : 1}5c and iso-C_{15 : 0}. Major polar lipids were phosphatidylethanolamine and unknown aminolipids and polar lipids. On the basis of the evidence from this polyphasic study, strain 5715S-11^T 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-11^T (=KACC 12603^T =DSM 19387^T).

Cellular fatty acid profiles of strain 5715S-11^T, Spirosoma linguale DSM 74^T and Larkinella insperata LMG 22510^T are available as supplementary material with the online version of this paper.