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A Gram-negative, pale-yellow, non-spore-forming bacterium, motile with single polar flagella, strain E6T, was isolated from coastal seawater collected from Tianjin, China, and its taxonomic position was investigated using a polyphasic approach. Strain E6T requires NaCl for growth and grows optimally at pH 8.2 and 36 °C and in the presence of 2.0 % (w/v) NaCl. It is positive for catalase and oxidase, and reduces nitrate to nitrite. The major fatty acids (>10 %) are C18 : 1 ω7c (64.71 %) and 11-methyl C18 : 1 ω7c (12.38 %), the ubiquinone system is Q-10 and the DNA G+C content is 53.1 mol%. Phylogenetic analyses based on 16S rRNA gene sequences demonstrated that strain E6T represented a new lineage in the Alphaproteobacteria and is related to genera Cucumibacter, Devosia, Ochrobactrum and Ahrensia. Strain E6T shows highest 16S rRNA gene sequence similarity (93.3 %) to Cucumibacter marinus CL-GR60T and less than 92.2 % similarity to other relatives. It can be differentiated from its closest phylogenetic neighbours on the basis of several phenotypic features, including nitrate reduction, assimilation of d-glucose, l-arabinose, d-mannose, mannitol and maltose and major fatty acid composition. A polyphasic analysis supported the conclusion that strain E6T represents a novel genus and species of the family Hyphomicrobiaceae, for which the name Zhangella mobilis gen. nov., sp. nov. is proposed. The type strain of Zhangella mobilis is E6T (=CGMCC 1.7002T =JCM 15144T).
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