Summary auto-generated
This study reclassifies the bacterium originally described as "Pseudomonas riboflawina" into a new genus, Devosia riboflawina. The researchers analyzed strain IFO 13584T using 16S rRNA gene sequencing, chemotaxonomic analysis, and phylogenetic methods. The organism is a gram-negative, strictly aerobic, motile rod with several distinctive characteristics: ubiquinone 10 as its major respiratory quinone, a DNA G+C content of 61.4 mol%, and unusually long-chain 3-hydroxy fatty acids (3-OH 24:1 and 3-OH 26:1) as major cellular components. Phylogenetic analysis based on 16S rRNA sequences revealed that this organism occupies an independent position within the α subclass of Proteobacteria, distinct from other proteobacterial genera. The researchers propose establishment of the new genus Devosia to accommodate this bacterium, which was previously misclassified in Pseudomonas. The unique fatty acid profile and phylogenetic position justify this taxonomic reclassification.
Key findings
- 16S rRNA sequence analysis placed the organism in an independent position within the α subclass of Proteobacteria, separate from established genera
- The bacterium possesses uniquely long-chain 3-hydroxy fatty acids (3-OH 24:1 and 3-OH 26:1) as major cellular components, not found in other proteobacteria in similar proportions
- DNA G+C content of 61.4 mol% and ubiquinone 10 as the major respiratory quinone support classification in the α subclass
- Only one strain of this species is available in culture collections, limiting full characterization of the new genus
- The organism shows 91.9-93.1% 16S rRNA similarity to Rhizobiaceae members but represents a phylogenetically distinct lineage
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Abstract
The taxonomic position of "Pseudomonas riboflavina" was studied by 16S rRNA gene sequencing and chemotaxonomic methods. This organism is a gram-negative, strictly aerobic rod and has a DNA guanine-plus-cytosine content of 61.4 mol%; the major isoprenoid quinone is ubiquinone 10, and the unusual cellular fatty acids 3-hydroxytetracosenoic acid (3-OH 24:1) and 3-hydroxyhexacosenoic acid (3-OH 26:1) are the major 3- hydroxy cellular fatty acids. A phylogenetic analysis based on 16S rRNA sequences revealed that "P. riboflavina" IFO 13584T (T = type strain) occupies an independent position in the alpha subclass of the Proteobacteria. On the basis of our data, we propose that "P. riboflavina" IFO 13584T should be transferred to the genus Devosia gen. nov. as Devosia riboflavina sp. nov., nom. rev.