Three strains of anaerobic, non-spore-forming, Gram-negative coccobacilli (YIT 11816, YIT 11817 and YIT 11818) were isolated from human faeces. On the basis of 16S rRNA gene sequence similarity, these strains were shown to belong to the family and to be related to the type strain of (94.9 %) and to WAL 7877 (94.3 %); the similarity to strains of any other species with a validly published name within the family was less than 92 %. Biochemical data supported the affiliation of these strains to the genus . These strains therefore represent a novel species, for which the name sp. nov. is proposed; the type strain is YIT 11816 (=DSM 19354 =JCM 14724). The cells of another isolate, strain YIT 11815, were non-spore-forming, Gram-negative, very large rods, 1×5–200 μm in size, with or without a central, subterminal or terminal swelling of 2–4 μm diameter when grown in a broth medium supplemented with glucose. Based on comparative 16S rRNA gene sequencing, this bacterium is a member of the family , and most closely related to (95.3 % similarity to the type strain). Interestingly, the 16S rRNA gene sequence of strain YIT 11815 showed 99 % similarity to sequences of uncultured colonic bacteria. A 16S rRNA gene sequence divergence value of >3 % from known cultured species suggested that isolate YIT 11815 represents a novel species, for which the name sp. nov. is proposed; the type strain is YIT 11815 (=DSM 19343 =JCM 14723).


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vol. , part 4, pp. 970 - 975

RAPD-PCR fingerprinting of the three novel isolates. [PDF](74 KB)

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