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Victivallis vadensis gen. nov., sp. nov., a sugar-fermenting anaerobe from human faeces

¹ Laboratory of Microbiology, Wageningen University, Hesselink van Suchtelenweg 4, 6703 CT Wageningen, The Netherlands
² Wageningen Centre for Food Sciences, PO Box 557, 6700 AN Wageningen, The Netherlands

Correspondence
Caroline Plugge
caroline.plugge{at}wur.nl

A novel strictly anaerobic, cellobiose-degrading bacterium, strain Cello^T, was isolated from a human faecal sample by combining enrichments in liquid and soft-agar basal media. A noteworthy characteristic was its inability to grow on normal agar plates and in roll tubes. The cells were coccus shaped and non-motile, with an extracellular slime layer. Growth of strain Cello^T occurred between 20 and 40 °C, with optimal growth at 37 °C. The pH range for growth was 5–7·5 with an optimum at 6·5. In pure culture, strain Cello^T could only grow on a variety of sugars. Glucose was converted to acetate, ethanol and H₂. The doubling time on glucose was 0·5 h. In a syntrophic co-culture with Methanospirillum hungatei strain JF-1^T, strain Cello^T converted glucose to acetate and H₂. The G+C content was 59·2 mol%. 16S rDNA analysis revealed that the closest relatives of strain Cello^T were two uncultured bacteria from anaerobic digesters, both with 94 % 16S rDNA sequence similarity. The closest cultured representatives belong to genera of the bacterial division ‘Verrucomicrobia’. The name Victivallis vadensis gen. nov., sp. nov. is proposed for strain Cello^T (=DSM 14823^T =ATCC BAA-548^T).

The GenBank accession number for the 16S rDNA sequence of strain Cello^T is AY049713.

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