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Microbacterium ginsengisoli sp. nov., a β-glucosidase-producing bacterium isolated from soil of a ginseng field

¹ Department of Oriental Medicinal Material and Processing College of Life Science, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea
² Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
³ Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA

Correspondence
Deok-Chun Yang
dcyang{at}khu.ac.kr

Strain Gsoil 259^T, a β-glucosidase-producing bacterium, was isolated from a soil sample from a ginseng field in the Republic of Korea and characterized in order to determine its taxonomic position. Cells were Gram-positive, heterotrophic, strictly aerobic, non-motile short rods. 16S rRNA gene sequence analysis revealed that strain Gsoil 259^T belonged to the genus Microbacterium and was closely related to Microbacterium arborescens IFO 3750^T (98.5 %) and Microbacterium imperiale IFO 12610^T (97.9 %). However, it has low values for DNA–DNA relatedness with the above strains (20.7 and 17.5 %, respectively). Strain Gsoil 259^T possessed chemotaxonomic markers that were consistent with classification in the genus Microbacterium, i.e. MK-11 and MK-12 were the major menaquinones and anteiso-C_{17 : 0}, anteiso-C_{15 : 0} and iso-C_{16 : 0} were the predominant cellular fatty acids. The DNA G+C content was 69.4 mol%. The cell-wall sugar was rhamnose and the diamino acid in the cell-wall peptidoglycan was ornithine. On the basis of data from this polyphasic study, strain Gsoil 259^T represents a novel species of the genus Microbacterium, for which the name Microbacterium ginsengisoli sp. nov. is proposed. The type strain is Gsoil 259^T (=KCTC 19189^T =DSM 18659^T).

An extended neighbour-joining phylogenetic tree based on 16S rRNA gene sequences and a table showing fatty acid compositions for Gsoil 259^T and members of the genus Microbacterium are available as supplementary material with the online version of this paper.

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