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Int J Syst Evol Microbiol. 2008 Jan;58(Pt 1):168-72. doi: 10.1099/ijs.0.65483-0.

Daeguia caeni gen. nov., sp. nov., isolated from sludge of a textile dye works.

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Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Republic of Korea.


A Gram-negative, non-spore-forming, rod-shaped bacterial strain, K107(T), was isolated from sludge collected from a textile dye works in Korea and its taxonomic position was investigated by means of a polyphasic analysis. Strain K107(T) contained Q-10 as the predominant ubiquinone. The major fatty acids (>10% of total fatty acids) were C(18:1)omega7c and C(18:1) 2-OH. The DNA G+C content was 57.0 mol%. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain K107(T) was closely related to the genera Mycoplana, Brucella and Ochrobactrum. Strain K107(T) exhibited 16S rRNA gene sequence similarity values of 96.3-97.1% with respect to the type strains of two Mycoplana species and 94.8-96.8% with respect to members of the genera Brucella and Ochrobactrum. A phylogenetic analysis based on recA gene sequences showed that strain K107(T) forms a distinct phylogenetic lineage within the Alphaproteobacteria. The recA gene sequence of strain K107(T) showed similarity values of 84.5% with respect to type strains of Brucella species and values of 77.6-83.1% with respect to members of the genera Pseudochrobactrum, Ochrobactrum and Mycoplana. Strain K107(T) could be differentiated from phylogenetically related genera by differences in phenotypic properties and fatty acid profiles. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain K107(T) represents a novel genus and species, for which the name Daeguia caeni gen. nov., sp. nov. is proposed. The type strain of Daeguia caeni is strain K107(T) (=KCTC 12981(T) =CCUG 54520(T)).

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