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Rubritepida flocculans gen. nov., sp. nov., a new slightly thermophilic member of the alpha-1 subclass of the Proteobacteria.

A bacterial isolate, with an optimum growth temperature of about 50 degrees C, was recovered from the hot spring at Egerszalók in Hungary. Phylogenetic analyses using the 16S rRNA gene sequence of strain H-8T indicated that the new organism represented a new genus and species of alpha-1 subclass of the Proteobacteria. The major fatty acids of strain H-8T are 16:0, 18:1 omega7c; the rare fatty acid 19:0 20H cyclo 11,12 is also present. Ubiquinone 9 is the major respiratory quinone, the polar lipids are phosphatidylcholine, phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol in addition to two unidentified aminolipids. The new isolate forms red-colored colonies, flocculates in liquid media, is heterotrophic and strictly aerobic. Thiosulfate is oxidized to sulfate, but an increase in biomass could not be measured because of the flocculating behavior. Bacteriochloropyll a was detected by direct spectrophotometric analysis when the organism was grown at 30 degrees C, but could not be detected after growth at 50 degrees C. pufL and pufM genes were present. Heterotrophic growth of strain H-8T occurs on a few carbohydrates, amino acids and organic acids. On the basis of the phylogenetic analyses, physiological and biochemical characteristics, we propose that strain H-8T represents a new genus and a new species most closely related to Roseococcus thiosulfatophilus for which we propose the name Rubritepida flocculans.