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Flavobacterium filum sp. nov., isolated from a wastewater treatment plant in Korea

¹ Division of Applied Life Science, EB-NCRC, PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
² Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-701, Republic of Korea

Correspondence
Che Ok Jeon
cojeon{at}gnu.ac.kr

A Gram-negative bacterium, designated strain EMB34^T, was isolated from a wastewater treatment plant in Korea. Growth was observed between 10 and 40 °C (optimum, 25–35 °C) and between pH 6.0 and 9.5 (optimum, pH 7.5–8.0). The cells were non-motile rods, linked with extracellular fibrils. The predominant fatty acids of strain EMB34^T were iso-C_{15 : 0}, C_{15 : 0}, iso-C_{15 : 1} G, iso-C_{16 : 0} 3-OH and iso-C_{15 : 0} 3-OH and the strain contained phosphatidylethanolamine and phosphatidylinositol as the polar lipids. The G+C content of the genomic DNA was 34.2 mol% and the major quinone was menaquinone-6. Comparative 16S rRNA gene sequence analyses showed that strain EMB34^T formed a distinct phyletic line within the genus Flavobacterium. The levels of 16S rRNA gene sequence similarity with other Flavobacterium species were less than 94.5 %. On the basis of phenotypic, chemotaxonomic and molecular data, it is clear that strain EMB34^T represents a novel species within the genus Flavobacterium, for which the name Flavobacterium filum sp. nov. is proposed. The type strain is EMB34^T (=KCTC 12610^T=DSM 17961^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain EMB34^T is DQ372981.

A transmission electron micrograph showing cells of strain EMB34^T linked by extracellular fibrils is available as a supplementary figure with the online version of this paper.

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