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Knoellia aerolata 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 KACC – Korean Agricultural Culture Collection, 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
⁴ Soil Management Division, National Institute of Agricultural Science and Technology, Rural Development Administration, Suwon 441-707, Republic of Korea

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

An aerobic, Gram-positive, non-motile, non-spore-forming, rod–coccus-shaped bacterium, strain 5317S-21^T, was isolated from an air sample from Suwon city, Republic of Korea. The isolate was able to grow within a pH range of 5.0–9.0 and a temperature range of 5–35 °C and it tolerated up to 2 % (w/v) NaCl. The cell-wall peptidoglycan contained meso-diaminopimelic acid as diagnostic diamino acid. The predominant isoprenoid quinone was MK-8(H₄). The major polar lipids were phosphatidylinositol, phosphatidylethanolamine and diphosphatidylglycerol; phosphatidylglycerol and several unknown phospholipids were also detected. Mycolic acids were absent. The only whole-cell sugar was glucose. The major cellular fatty acids were iso-C_{16 : 0}, C_{17 : 1}8c and iso-C_{15 : 0}. 16S rRNA gene sequence analysis indicated that strain 5317S-21^T was related phylogenetically to members of the genus Knoellia, with 97.4 % sequence similarity to the type strains of Knoellia sinensis and Knoellia subterranea. The G+C content of the genomic DNA of strain 5317S-21^T was 73 mol%. Levels of DNA–DNA relatedness between strain 5317S-21^T and the type strains of Knoellia sinensis and Knoellia subterranea were 37 and 41 %, respectively. It was concluded that strain 5317S-21^T represents a novel species of the genus Knoellia, for which the name Knoellia aerolata sp. nov. is proposed. The type strain is 5317S-21^T (=KACC 20583^T =DSM 18566^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain 5317S-21^T is EF553529.

Polar lipid profiles and fatty acid compositions of strain 5317S-21^T and members of the genus Knoellia are available as supplementary material with the online version of this paper.