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Phenylobacterium koreense sp. nov., isolated from South Korea

¹ Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea
² National University of Uzbekistan, Students Town, Tashkent, 700-174, Uzbekistan

Correspondence
Sung-Taik Lee
e_stlee{at}kaist.ac.kr

A Gram-negative, aerobic, rod-shaped, non-spore-forming bacterium, Slu-01^T, was isolated from activated sludge from a wastewater treatment plant in Daejeon, South Korea. After 3 days on R2A medium, strain Slu-01^T developed colourless colonies (0·7–1·2 mm). The non-motile rods (0·7–1·0x1·0–2·0 µm) were slightly curved and occurred singly and in pairs. No filamentous cells were found. On the basis of 16S rRNA gene sequence similarity, strain Slu-01^T was shown to belong to the family Caulobacteraceae and was most closely related to Phenylobacterium immobile (96·6 %) and Phenylobacterium lituiforme (96·5 %). The genomic DNA G+C content of strain Slu-01^T was 68·1 mol%, within the range of 67·3–68·4 mol% for the genus Phenylobacterium. Chemotaxonomic data (major ubiquinone, Q-10; major fatty acids C_{18 : 1}7c, C_{16 : 0}, C_{15 : 0} and C_{17 : 0}) and 16S rRNA gene sequence analysis supported the affiliation of strain Slu-01^T to the genus Phenylobacterium. However, DNA–DNA hybridization data and phenotypic properties showed that strain Slu-01^T could be distinguished from the two other Phenylobacterium species with validly published names. Thus, it is suggested that strain Slu-01^T represents a novel species of the genus Phenylobacterium, for which the name Phenylobacterium koreense is proposed. The type strain is Slu-01^T (=KCTC 12206^T=IAM 15119^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain Slu-01^T is AB166881.

A table comparing the cellular fatty acid profiles of strain Slu-01^T, Phenylobacterium immobile and Phenylobacterium lituiforme is available as supplementary material in IJSEM Online.

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