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Strain ZF2T, isolated from freshwater sediment, is a motile, rod-shaped, gram-positive, endospore-forming, amino acid- and pyruvate-utilizing, anaerobic bacterium. It requires yeast extract for growth. Carbohydrates are not utilized. The optimal temperature and pH for growth are 37 degrees C and 6.8-7.3, respectively. The G+C content of the DNA is 34.0 mol %. A 16S rDNA sequence analysis of strain ZF2T revealed that the highest similarity (94.4%) was shared with Clostridium hydroxybenzoicum JW/Z-1T. Strain ZF2T, however, was not able to carboxylate phenol or to decarboxylate 4-hydroxybenzoate, which are characteristic properties of strain JW/Z-1T. The degree of 16S rDNA relatedness, together with the physiological and chemotaxonomic properties, suggest that strain ZF2T represents a novel species that is clearly distinct from Clostridium hydroxybenzoicum JW/Z-1T. In a phylogenetic dendrogram, both strains form a separate cluster that is peripherally associated with the Peptostreptococcus group (cluster XIII) of the clostridia and the lineage of Helcococcus kunzii. Strains ZF2T and JW/Z-1T show a somewhat deeper branching from the cluster XII clostridia Clostridium purinolyticum and Clostridium acidiurici. The latter strains possessed the closest 16S rDNA similarity (between 88.4 and 90.7%), but were clearly separated by phenotypic markers. Therefore, a new genus, Sedimentibacter gen. nov., is described, comprising Sedimentibacter hydroxybenzoicus gen. nov., comb. nov., as the type species of the genus, with JW/Z-1T (= ATCC 51151T = DSM 7310T) as the type strain, and the novel species Sedimentibacter saalensis sp. nov., with strain ZF2T (= DSM 13558T = ATCC BAA-283T) as the type strain.

international journal of systematic and evolutionary microbiology

Reclassification of Clostridium hydroxybenzoicum as Sedimentibacter hydroxybenzoicus gen. nov., comb. nov., and description of Sedimentibacter saalensis sp. nov..