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Int J Syst Evol Microbiol 59 (2009), 1738-1742; DOI  10.1099/ijs.0.007591-0
© 2009 International Union of Microbiological Societies

Microbacterium insulae sp. nov., isolated from soil

Jung-Hoon Yoon1, Peter Schumann2, So-Jung Kang1, Chang-Soo Lee1, Soo-Young Lee1 and Tae-Kwang Oh1

1 Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Republic of Korea
2 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, D-38124 Braunschweig, Germany

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

A Gram-positive, non-motile, rod- or coccoid-shaped Microbacterium-like bacterium, designated strain DS-66T, was isolated from soil of Dokdo, Korea, and its exact taxonomic position was investigated by using a polyphasic approach. Strain DS-66T grew optimally at 30 °C and pH 6.5–7.0 in the presence of 0.5–1.0 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain DS-66T belonged to the genus Microbacterium. Strain DS-66T had a peptidoglycan type based on B2β with partial substitution of glutamic acid by 3-hydroxy glutamic acid (Glu/Hyg–Gly–D-Orn), and galactose, rhamnose and ribose as whole-cell sugars. The acyl type was glycolyl. Strain DS-66T contained MK-13, MK-12 and MK-14 as predominant menaquinones and anteiso-C15 : 0, anteiso-C17 : 0, iso-C17 : 0 and iso-C16 : 0 as major fatty acids. Major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, an unidentified phospholipid and an unidentified glycolipid. The DNA G+C content was 69.9 mol%. Phylogenetic distinctiveness, DNA–DNA relatedness data and differential phenotypic properties demonstrated that strain DS-66T is distinguishable from recognized Microbacterium species. On the basis of the data presented, strain DS-66T is considered to represent a novel species of the genus Microbacterium, for which the name Microbacterium insulae sp. nov. is proposed. The type strain is DS-66T (=KCTC 19247T=CCUG 54523T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain DS-66T is EU239498.

An extended neighbour-joining tree based on 16S rRNA gene sequences showing the phylogenetic positions of strain DS-66T, the type strains of Microbacterium species and representatives of some other related taxa is available as supplementary material with the online version of this paper.






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