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Updated: Jun 8, 2026

Isolation and Characterization of the Natural Microbiota of the Model Nematode Caenorhabditis elegans
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Published on: August 17, 2022

Paracoccus caeni sp. nov., isolated from sludge.

Myungjin Lee1, Song-Geun Woo2,1, Giho Park3

  • 1Research and Development Division, H-Plus Eco Ltd, BVC #301, KRIBB, Eoeun-dong, Yuseong-gu, Daejeon 305-333, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology
|September 21, 2010
PubMed
Summary

A novel bacterium, Paracoccus caeni sp. nov., was identified in South Korean sewage sludge. This discovery expands the known diversity within the Paracoccus genus, important for microbial ecology studies.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Environmental Science

Background:

  • The genus Paracoccus comprises diverse bacteria found in various environments.
  • Characterization of novel bacterial species is crucial for understanding microbial diversity and ecological roles.

Purpose of the Study:

  • To isolate and characterize a novel bacterium from sewage sludge.
  • To determine the phylogenetic and taxonomic position of the novel isolate within the genus Paracoccus.

Main Methods:

  • Isolation and cultivation of bacteria from sewage sludge.
  • 16S rRNA gene sequence analysis for phylogenetic placement.
  • DNA-DNA hybridization for genetic relatedness assessment.
  • Analysis of chemotaxonomic and phenotypic characteristics.

Main Results:

  • A Gram-negative, non-motile bacterium, strain MJ17(T), was isolated.
  • Phylogenetic analysis placed strain MJ17(T) within the genus Paracoccus, with highest 16S rRNA gene similarities to P. homiensis (97.4%).
  • Low DNA-DNA relatedness (<22%) with related species confirmed its novelty.
  • Distinct phenotypic characteristics, including fatty acid profiles and G+C content (58.7 mol%), supported its classification.

Conclusions:

  • Strain MJ17(T) represents a novel species within the genus Paracoccus.
  • The proposed name for this new species is Paracoccus caeni sp. nov.
  • This finding contributes to the taxonomic knowledge of the Alphaproteobacteria class.