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Cucumibacter marinus gen. nov., sp. nov., a marine bacterium in the family Hyphomicrobiaceae

School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-742, Republic of Korea

Correspondence
Byung C. Cho
bccho{at}snu.ac.kr

A Gram-negative, rod-shaped, strictly aerobic micro-organism, designated strain CL-GR60^T, was isolated from coastal seawater from the East Sea, Korea. A 16S rRNA gene sequence analysis revealed a clear affiliation with the family Hyphomicrobiaceae. Phylogenetic analyses showed that strain CL-GR60^T formed a robust cluster with the species of the genus Devosia at sequence similarity levels of 91.1–93.1 %; no other species in the family Hyphomicrobiaceae shared more than 90 % sequence similarity with strain CL-GR60^T. The strain grew optimally in the presence of 3–4 % sea salts at 30–35 °C and pH 7. The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, two unidentified glycolipids, an unidentified phospholipid and an unidentified lipid. The strain contained C_{18 : 1}7c (54.7 %), 11-methyl C_{18 : 1}7c (19.3 %), C_{18 : 0} (14.4 %) as the predominant fatty acids. Ubiquinone-10 was the major quinone. The DNA G+C content was 62.9 mol%. On the basis of physiological data, fatty acid composition and results of phylogenetic analysis of the 16S rRNA gene sequence, strain CL-GR60^T represents a novel genus and species within the family Hyphomicrobiaceae, for which the name Cucumibacter marinus gen. nov., sp. nov. is proposed. The type strain of Cucumibacter marinus is CL-GR60^T (=KCCM 90027^T =DSM 18995^T).

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