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Int J Syst Evol Microbiol 58 (2008), 116-119; DOI  10.1099/ijs.0.65229-0
© 2008 International Union of Microbiological Societies

Ornithinimicrobium pekingense sp. nov., isolated from activated sludge

Xing-Yu Liu1,2, Bao-Jun Wang1, Cheng-Ying Jiang1 and Shuang-Jiang Liu1

1 State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China

Correspondence
Shuang-Jiang Liu
liusj{at}sun.im.ac.cn

The bacterial strain LW6T was isolated from activated sludge of a wastewater treatment bioreactor. Cells of strain LW6T are Gram-positive, irregular, short rods and cocci, 0.5–0.8x1.0–1.6 µm. Colonies are light-yellow, smooth, circular and 0.2–1.0 mm in diameter after 3 days incubation. Strain LW6T is aerobic and heterotrophic. It grows at a temperature range of 26–38 °C and pH range of 6–9, with optimal growth at 33–37 °C and pH 7.8–8.2. The predominant cellular fatty acids of strain LW6T are iso-C15 : 0 (38.9 %) and iso-C17 : 1{omega}9c (18.8 %). Strain LW6T has the major respiratory menaquinones MK-8(H4) and MK-8(H2) and polar lipids phosphatidylinositol, phosphatidylglycerol, diphosphatidylglycerol and unknown glycolipid/phospholipids. The cell wall peptidoglycan of strain LW6T contained the amino acids ornithine, lysine, glutamic acid, alanine, glycine and aspartic acid. Its molar DNA G+C content is 69 mol% (Tm). Analysis of 16S rRNA gene sequences indicated that strain LW6T was related phylogenetically to members of the genus Ornithinimicrobium, with similarities ranging from 98.3 to 98.7 %. The DNA–DNA relatedness of strain LW6T to Ornithinimicrobium humiphilum DSM 12362T and Ornithinimicrobium kibberense K22-20T was respectively 31.5 and 15.2 %. Based on these results, it is concluded that strain LW6T represents a novel species of the genus Ornithinimicrobium, for which the name Ornithinimicrobium pekingense sp. nov. is proposed. The type strain is strain LW6T (=CGMCC 1.5362T =JCM 14001T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Ornithinimicrobium pekingense LW6T is DQ512860.

A scanning electron micrograph of cells of strain LW6T, two-dimensional thin-layer chromatograms of the polar lipids of strain LW6T and cellular fatty acid profiles of strain LW6T and related type strains are available as supplementary material with the online version of this paper.






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