The diversity of bacteria associated with inflamed mucosa was investigated by culturing ileal samples from TNF mice on a selective medium containing mucin. Among eight isolates, two strains (Mt1B3 and Mt1B8) belonged to bacterial groups not yet cultured from the mouse intestine. Whereas strain Mt1B3 was identified as a member of the family and is closely related to species and DSM 13886, strain Mt1B8 was a novel bacterium. Based on phylogenetic analysis, strain Mt1B8 is a member of the family . The closest relatives with validly published names were , (<96 % similarity) and species (<92 %). With respect to and , the phylogenetic position of strain Mt1B8 was confirmed at the chemotaxonomic level by Fourier-transform infrared spectroscopic analysis. The major fatty acid of strain Mt1B8 is C (23.9 %). Menaquinones were monomethylated. DNA–DNA relatedness between strain Mt1B8 and DSM 18785 was 28 %. Strain Mt1B8 is a Gram-positive-staining rod that does not form spores and has a high DNA G+C content (64.2  mol%). Cells are aerotolerant but grow only under strictly anoxic conditions. They are sensitive to cefotaxime, clarithromycin, erythromycin, metronidazole, tetracycline, tobramycin and vancomycin. API and VITEK analysis showed the ability of strain Mt1B8 to convert a variety of amino acid derivatives. According to these findings, it is proposed to create a novel genus and species, gen. nov., sp. nov., to accommodate strain Mt1B8. The type strain of is Mt1B8 (=DSM 19490 =CCUG 54980).


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Phylogenetic positions of strains Mt1B1–Mt1B7 and Mt1B8 among known members of the mouse intestinal microbiota and closely related species, based on neighbour-joining analysis of partial 16S rRNA gene sequences (548 bp). [PDF](59 KB)


Polar lipid analysis of strain Mt1B8 . DPG, Diphosphatidylglycerol; GL, glycolipid; PG, phosphatidylglycerol; PL, phospholipid.


Conversion of daidzein and genistein by strain Mt1B8 grown at 37 °C under anoxic conditions in BHI broth supplemented with 0.05 % (v/v) cysteine hydrochloride. [PDF](272 KB)


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