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.2014 Oct;64(Pt 10):3353-3359.
doi: 10.1099/ijs.0.060798-0. Epub 2014 Jul 10.

Oligoflexus tunisiensis gen. nov., sp. nov., a Gram-negative, aerobic, filamentous bacterium of a novel proteobacterial lineage, and description of Oligoflexaceae fam. nov., Oligoflexales ord. nov. and Oligoflexia classis nov

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Oligoflexus tunisiensis gen. nov., sp. nov., a Gram-negative, aerobic, filamentous bacterium of a novel proteobacterial lineage, and description of Oligoflexaceae fam. nov., Oligoflexales ord. nov. and Oligoflexia classis nov

Ryosuke Nakai et al. Int J Syst Evol Microbiol.2014 Oct.

Abstract

A phylogenetically novel proteobacterium, strain Shr3(T), was isolated from sand gravels collected from the eastern margin of the Sahara Desert. The isolation strategy targeted bacteria filterable through 0.2-µm-pore-size filters. Strain Shr3(T) was determined to be a Gram-negative, aerobic, non-motile, filamentous bacterium. Oxidase and catalase reactions were positive. Strain Shr3(T) showed growth on R2A medium, but poor or no growth on nutrient agar, trypticase soy agar and standard method agar. The major isoprenoid quinone was menaquinone-7. The dominant cellular fatty acids detected were C16:1ω5c and C16:0, and the primary hydroxy acid present was C12:0 3-OH. The DNA G+C content was 54.0 mol%. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain Shr3(T) was affiliated with an uncultivated lineage of the phylum Proteobacteria; the nearest known type strain, with 83% sequence similarity, was Desulfomicrobium orale DSM 12838(T) in the class Deltaproteobacteria. The isolate and closely related environmental clones formed a novel class-level clade in the phylum Proteobacteria with high bootstrap support (96-99%). Based on these results, the novel class Oligoflexia classis nov. in the phylum Proteobacteria and the novel genus and species Oligoflexus tunisiensis gen. nov., sp. nov. are proposed for strain Shr3(T), the first cultivated representative of the Oligoflexia. The type strain of Oligoflexus tunisiensis is Shr3(T) ( = JCM 16864(T) = NCIMB 14846(T)). We also propose the subordinate taxa Oligoflexales ord. nov. and Oligoflexaceae fam. nov. in the class Oligoflexia.

© 2014 IUMS.

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Figures

Fig. 1.
Fig. 1.
Light micrograph of cells of strain Shr3T. Filamentous, elongated fusiform and spiral cells were observed. Cells were grown on R2A for 5 days at 25 °C. Observations were made using differential interference contrast microscopy. Bar, 10 µm.
Fig. 2.
Fig. 2.
Transmission electron micrograph of cells of strain Shr3T. Many low electron-dense particles were observed. Cells were grown on R2A for 7 days at 25 °C. Bar, 1 µm.
Fig. 3.
Fig. 3.
Phylogenetic relationships of strain Shr3T, related environmental clones and known groups in the phylumProteobacteria based on 16S rRNA gene sequences. The tree, constructed using the neighbour-joining method, is based on a comparison of 1124 nucleotide positions. Bootstrap values >50 %, expressed as percentages of 1000 replicates, are shown above and below branches. Bar, 0.02 substitutions per nucleotide position. Trees reconstructed by the maximum-likelihood, minimum evolution and maximum-parsimony methods are available as Figs S1–S3.
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