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1 Microbe Division/Japan Collection of Microorganisms, RIKEN BioResource Center;
2 Tsurumi University School of Dental Medicine
3 E-mail: sakamoto{at}jcm.riken.jp
Two anaerobic, pigmented, non-spore-forming, Gram-negative rod-shaped strains isolated from the human oral cavity, OMA31T and OMA130, were characterized by determining phenotypic and biochemical features, cellular fatty acid profiles, and the phylogenetic positions based on 16S rRNA gene sequence analysis. 16S rRNA gene sequence analysis showed that the isolates were a single species of the genus Prevotella. These strains shared 100 % 16S rRNA gene sequence similarity with each other and were most closely related to Prevotella intermedia with 96.4 % 16S rRNA gene sequence similarity. The next closely related species to the isolates were Prevotella pallens (96.1 %) and Prevotella falsenii (95.3 %). The phenotypic and biochemical characteristics of the isolates were the same as those of P. intermedia JCM 12248T, P. falsenii JCM 15124T and Prevotella nigrescens JCM 12250T. The isolates could be differentiated from P. pallens JCM 11140T by mannose fermentation and
-fucosidase activity. Conventional biochemical tests were unable to differentiate these isolates from P. intermedia, P. falsenii and P. nigrescens. However, hsp60 gene sequence analysis suggested the isolate was different species from P. intermedia, P. pallens, P. falsenii and P. nigrescens. Based on these data, we propose a novel Prevotella species, Prevotella aurantiaca sp. nov. The type strain of Prevotella aurantiaca is OMA31T (= JCM 15754T = CCUG 57723T).
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