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Int J Syst Evol Microbiol 58 (2008), 1561-1565; DOI  10.1099/ijs.0.65787-0
© 2008 International Union of Microbiological Societies

Prosthecobacter fluviatilis sp. nov., which lacks the bacterial tubulin btubA and btubB genes

Minoru Takeda1, Akiko Yoneya1, Yuichi Miyazaki1, Keiko Kondo1, Hiroko Makita1, Masashi Kondoh2, Ichiro Suzuki1 and Jun-ichi Koizumi1

1 Division of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
2 Instrumental Analysis Center, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan

Correspondence
Minoru Takeda
mtake{at}ynu.ac.jp

Leptothrix cholodnii is a sheathed bacterium often found in metal-rich and oligotrophic aquatic environments. A bacterial strain that is able to degrade the NaOH-treated sheath of L. cholodnii was isolated. The isolate was a Gram-negative, aerobic and prosthecate bacterium. The optimum growth temperature and pH were 30 °C and pH 7.0, respectively. The DNA G+C content was 62.9 mol%. The major respiratory quinone was MK-6. A phylogenetic analysis based on the 16S rRNA gene indicated that the isolate is a member of the genus Prosthecobacter. The nearest relative was the type strain of Prosthecobacter vanneervenii, with a similarity of 97.1 %. However, the isolate does not possess the bacterial tubulin genes, btubA and btubB, unique to known species of the genus Prosthecobacter. It is proposed that the isolate represents a novel species, Prosthecobacter fluviatilis sp. nov. The type strain is HAQ-1T (=JCM 14805T =KACC 12649T =KCTC 22182T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain HAQ-1T is AB305640.

A graph showing growth of strain HAQ-1T on mucopolysaccharide and figures showing the positions of PCR primers specific for the btubA and btubB genes are available as supplementary material with the online version of this paper.






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