Pseudochrobactrum lubricantis sp. nov., isolated from a metal-working fluid
Peter Kämpfer1, Birgit Huber, Nicole Lodders
1Institut für Angewandte Mikrobiologie, Justus-Liebig-Universität Giessen, D-35392 Giessen, Germany. peter.kaempfer@umwelt.uni-giessen.de
Summary
A novel bacterium, Pseudochrobactrum lubricantis, was identified in metal-working fluid. This Gram-negative rod represents a new species within the Pseudochrobactrum genus, distinct from known relatives.
Area of Science:
- Microbiology
- Bacteriology
- Environmental Microbiology
Background:
- Metal-working fluids (MWFs) can harbor diverse microbial communities.
- Understanding bacterial diversity in industrial fluids is crucial for process management and environmental safety.
Purpose of the Study:
- To characterize and classify a novel bacterial isolate from a water-mixed metal-working fluid.
- To determine if the isolate represents a new species within the genus Pseudochrobactrum.
Main Methods:
- Isolation and phenotypic characterization of the bacterial strain KSS 7.8(T).
- Phylogenetic analysis based on 16S rRNA and recA gene sequences.
- Chemotaxonomic analyses including fatty acid profiling, polar lipid composition, quinone system, and polyamine patterns.
- DNA-DNA hybridization (DDH) to assess genomic relatedness with existing species.
Main Results:
- The isolate, KSS 7.8(T), is a Gram-negative, rod-shaped, oxidase-positive, non-spore-forming, non-motile bacterium.
- Phylogenetic analyses placed the isolate within the genus Pseudochrobactrum.
- Chemotaxonomic data (fatty acids, lipids, quinones, polyamines) supported the genus assignment.
- Low DNA-DNA hybridization values (24.2–45.7%) differentiated KSS 7.8(T) from related Pseudochrobactrum species.
- Physiological and biochemical tests further distinguished the isolate from described species.
Conclusions:
- The novel bacterium KSS 7.8(T) represents a new species, Pseudochrobactrum lubricantis sp. nov.
- The type strain is KSS 7.8(T) (=CCUG 56963(T)=CCM 7581(T)).
- This finding expands the known diversity within the Pseudochrobactrum genus and highlights the microbial potential in industrial fluids.
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