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Comamonas badia sp. nov., a floc-forming bacterium isolated from activated sludge
1Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan. tagoys@iam.u-tokyo.ac.jp
The Journal of General and Applied Microbiology
|March 5, 2005
Summary
A novel bacterium, Comamonas badia sp. nov. (strain IAM 14839), was identified in activated sludge. This motile, aerobic bacterium exhibits unique growth characteristics and has been phylogenetically classified within the Comamonas genus.
Area of Science:
- Microbiology
- Bacterial Taxonomy
- Environmental Microbiology
Background:
- Activated sludge harbors diverse microbial communities crucial for wastewater treatment.
- Characterization of novel bacterial strains aids in understanding microbial ecology and developing biotechnological applications.
Purpose of the Study:
- To isolate and characterize a novel bacterial strain from activated sludge.
- To determine the phylogenetic and phenotypic properties of strain IAM 14839.
- To propose a new species classification for the identified bacterium.
Main Methods:
- Isolation and cultivation of bacteria from activated sludge.
- Gram staining, motility tests, oxidase and catalase activity assays.
- Growth studies at different temperatures and on various substrates.
- DNA G+C content determination, quinone analysis, and cellular fatty acid profiling.
- 16S ribosomal DNA (rDNA) sequence analysis for phylogenetic placement.
Main Results:
- Strain IAM 14839 is a Gram-negative, rod-shaped, strictly aerobic, and highly motile bacterium.
- The strain forms visible flocs, grows optimally at 20°C (not at 37°C), and does not grow on sugars.
- Phylogenetic analysis based on 16S rDNA sequence data placed the strain within the genus Comamonas.
- Key chemotaxonomic features include DNA G+C content of 66.3 mol%, Q-8 quinone, and specific major cellular fatty acids.
Conclusions:
- Strain IAM 14839 represents a novel species within the genus Comamonas.
- The proposed name for this new species is Comamonas badia sp. nov.
- The type strain for this novel species is IAM 14839T (=KCTC 12244T).