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1 Department of Oral Microbiology, School of Dentistry, Asahi University, Gifu 501-02, Japan
2 Department of Oral Microbiology, School of Dentistry, Niigata University, Niigata 951, Japan
3Department of Molecular Microbiology, Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima 729-02, Japan
* Corresponding author. Mailing address: Department of Oral Microbiology, Asahi University School of Dentistry, Hozumi, Gifu-Ken, 501-02 Japan. Phone and fax: (81) 058-329-1423. E-mail: toshiu{at}hatelecom.or.jp.
ABSTRACT
A new Treponema species, for which we propose the name Treponema medium, was isolated from subgingival plaque from an adult with periodontal disease. The morphological characteristics, differential biochemical characteristics, and protein profiles on sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels of this organism are described. The guanine-plus-cytosine content of the DNA of T. medium is 51 mol%. The levels of DNA-DNA relatedness of the new species to other Treponema species, including Treponema denticola, Treponema vincentii, Treponema socranskii, Treponema pallidum, and Treponema phagedenis, are less than 30%. A phylogenetic analysis based on 16S rRNA sequences distinguished the new Treponema strain from strains belonging to previously described Treponema species. The type strain of T. medium is strain G7201.
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