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Int J Syst Evol Microbiol 59 (2009), 2843-2847; DOI  10.1099/ijs.0.010611-0
© 2009 International Union of Microbiological Societies

Parabacteroides gordonii sp. nov., isolated from human blood cultures

Mitsuo Sakamoto1, Natsuko Suzuki1, Naohisa Matsunaga2, Kimihito Koshihara2, Masayasu Seki3, Hideaki Komiya3 and Yoshimi Benno1

1 Microbe Division/Japan Collection of Microorganisms, RIKEN BioResource Center, Wako, Saitama 351-0198, Japan
2 Department of Infection Control and Prevention, Tokyo Medical University Hospital, Shinjuku-ku, Tokyo 160-0023, Japan
3 Department of General Medical and Primary Care, Tokyo Medical University Hospital, Shinjuku-ku, Tokyo 160-0023, Japan

Correspondence
Mitsuo Sakamoto
sakamoto{at}jcm.riken.jp

Three bacterial strains that had been isolated from human blood cultures, MS-1T, MS-2 and MS-3, were characterized for their phenotypic and biochemical features, cellular fatty acid profiles, menaquinone profiles and phylogenetic positions based on 16S rRNA gene sequence analysis. 16S rRNA gene sequence analysis showed that the isolates were members of the genus Parabacteroides. These isolates were most closely related to Parabacteroides goldsteinii JCM 13446T, with 95.9 % 16S rRNA gene sequence similarity. The levels of sequence similarity among the three strains were 99.7–100 %. The isolates were obligately anaerobic, non-pigmented, non-spore-forming, non-motile, Gram-negative and rod-shaped. The strains grew on media containing 20 % bile. These strains could be differentiated from P. goldsteinii by their ability to ferment L-arabinose and inabilities to ferment cellobiose, L-rhamnose and trehalose or to hydrolyse aesculin. The major menaquinone of the isolates was MK-10. Based on these data, we propose a novel Parabacteroides species, Parabacteroides gordonii sp. nov. The type strain is MS-1T (=JCM 15724T =CCUG 57478T).

Abbreviations: FAME, fatty acid methyl ester

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains MS-1T, MS-2 and MS-3 are AB470343–AB470345, respectively.






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