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Arcobacter marinus sp. nov.

Hye Min Kim1, Chung Yeon Hwang1, Byung Cheol Cho1

  • 1School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology
|August 6, 2009
PubMed
Summary

A novel marine bacterium, Arcobacter marinus sp. nov. (CL-S1(T)), was identified in the East Sea. This Gram-negative bacterium represents a new species within the Arcobacter genus, distinct from its closest relative, Arcobacter halophilus.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Marine Biology
  • Genetics

Background:

  • The genus Arcobacter, within the class Epsilonproteobacteria, comprises various marine and freshwater microorganisms.
  • Accurate taxonomic classification of newly isolated bacterial strains is crucial for understanding microbial diversity and ecological roles.

Purpose of the Study:

  • To characterize and taxonomically classify a novel marine bacterium, strain CL-S1(T), isolated from the East Sea.
  • To determine the phylogenetic and genomic distinctiveness of strain CL-S1(T) within the Arcobacter genus.

Main Methods:

  • Isolation and cultivation of marine bacterium strain CL-S1(T) under aerobic and microaerobic conditions.
  • Phylogenetic analysis using 16S rRNA and gyrA gene sequencing.
  • DNA-DNA hybridization for genomic relatedness assessment.
  • Physiological and biochemical characterization, including growth conditions and fatty acid profiling.

Main Results:

  • Strain CL-S1(T) is a slightly curved, rod-shaped, Gram-negative marine bacterium.
  • Phylogenetic analyses placed strain CL-S1(T) within the genus Arcobacter, closely related to Arcobacter halophilus.
  • DNA-DNA relatedness of 44% and distinct phenotypic characteristics (e.g., aerobic growth at 10°C) confirmed it as a novel species.
  • Optimal growth occurred at 30-37°C, pH 7, and 3-5% NaCl, with specific dominant cellular fatty acids identified.

Conclusions:

  • Strain CL-S1(T) represents a novel species of the genus Arcobacter, named Arcobacter marinus sp. nov.
  • The proposed type strain is CL-S1(T) (=KCCM 90072(T) =JCM 15502(T)).
  • This finding expands the known diversity of the Arcobacter genus in marine environments.