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International Journal of Systematic and Evolutionary Microbiology, Vol 52, 895-900, Copyright © 2002 by Society for General Microbiology
M. Takeda, Y. Kamagata, W. C. Ghiorse, S. Hanada and J. Koizumi
Division of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
A poly(3-hydroxybutyrate) (PHB)-degrading, Gram-negative, aerobic bacterium, strain HS(T), was isolated from a hot spring and chemotaxonomically and phylogenetically characterized. The oxidase-positive, weakly catalase-positive, non-pigmented cells (0.6 x 2.6 microm) exhibited a single polar flagellum and accumulated PHB granules. Strain HS(T) was capable of manganese oxidation. Highest growth rate was attained at 50 degrees C. The optimum pH for growth was 7--8. The major respiratory quinone was ubiquinone-8 and major cellular fatty acids were C(16:0), C(16:1) and C(18:1). The G+C content of the DNA was 66.2 mol%. Comparative 16S rDNA analysis indicated that strain HS(T) is related to the Rubrivivax subgroup and the family Comamonadaceae. The nearest phylogenetic relatives were Ideonella dechloratans (92.1% similarity), Leptothrix discophora (93.6%), Roseateles depolymerans (92.4%) and Rubrivivax gelatinosus (92.2%). On the basis of its phylogenetic and phenotypic properties, it is proposed that this isolate be designated Caldimonas manganoxidans gen. nov., sp. nov.; the type strain is HS(T) (=JCM 10698(T)=IFO 16448(T)=ATCC BAA-369(T)).
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