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Tahibacter caeni sp. nov., isolated from activated sludge.

Ya-Dong Wu1, Shi-Kai Deng1, Chao Shi1

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A novel bacterial species, Tahibacter caeni BUT-6(T), was discovered in wastewater sludge. This Gram-negative bacterium expands the known diversity within the Tahibacter genus.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Environmental Science

Background:

  • Wastewater treatment facilities harbor diverse microbial communities.
  • Characterization of novel bacterial species is crucial for understanding microbial ecology and potential applications.

Purpose of the Study:

  • To isolate and characterize a novel bacterial strain from activated sludge.
  • To determine the taxonomic position of the novel strain using polyphasic characterization.

Main Methods:

  • Isolation and cultivation of bacterial strain BUT-6(T) from activated sludge.
  • Physicochemical property analysis, including growth conditions and biochemical tests.
  • Phylogenetic analysis based on 16S rRNA gene sequencing.
  • DNA-DNA hybridization for genetic relatedness assessment.
  • Fatty acid, respiratory quinone, and polar lipid profiling.
  • DNA G+C content determination.

Main Results:

  • Strain BUT-6(T) is a Gram-negative, aerobic, non-motile, non-spore-forming rod.
  • Optimal growth observed at 30 °C, pH 7.0, and 1.0% NaCl.
  • Phylogenetic analysis indicated close relation to Tahibacter aquaticus (98.6% 16S rRNA similarity).
  • DNA-DNA relatedness with T. aquaticus was 47.1%, supporting distinct species status.
  • Unique fatty acid, respiratory quinone, and polar lipid profiles were identified.
  • DNA G+C content was determined to be 71.7 mol%.

Conclusions:

  • Strain BUT-6(T) represents a novel species within the genus Tahibacter.
  • The proposed name for the novel species is Tahibacter caeni sp. nov.
  • The type strain is BUT-6(T) (= CCTCC AB 2013266(T) = KACC 17139(T)).