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Deinococcus sedimenti sp. nov. isolated from river sediment.

Jae-Jin Lee1, Yeon-Hee Lee1, Su-Jin Park1

  • 1School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea.

Journal of Microbiology (Seoul, Korea)
|November 27, 2016
PubMed
Summary

A novel bacterium, Deinococcus sedimenti sp. nov., was discovered in the Han River, exhibiting resistance to gamma radiation. This Gram-positive organism represents a new species within the Deinococcus genus.

Keywords:
DeinococcusGamma radiation-resistancepolyphasic taxonomy

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Area of Science:

  • Microbiology
  • Bacteriology
  • Genomics

Background:

  • The genus Deinococcus is known for its radiation resistance and is found in diverse environments.
  • Isolation of novel bacterial species is crucial for understanding microbial diversity and potential applications.

Purpose of the Study:

  • To characterize a novel bacterium isolated from river sediment.
  • To determine the phylogenetic and genotypic relationship of the novel strain to the genus Deinococcus.
  • To propose a new species within the genus Deinococcus.

Main Methods:

  • 16S rRNA gene sequencing for phylogenetic analysis.
  • DNA-DNA hybridization for genomic relatedness.
  • Physiological and biochemical tests for phenotypic characterization.
  • Chemotaxonomic analysis (fatty acids, polar lipids, quinones).

Main Results:

  • Strain 16F1LT, a Gram-positive, non-motile bacterium, was isolated from Han River sediment.
  • Phylogenetic analysis based on 16S rRNA gene sequences placed the strain within the genus Deinococcus, with high similarity to Deinococcus daejeonensis MJ27T (99.0%).
  • Genomic DNA-DNA relatedness values were below 70%, confirming it as a distinct genomic species.
  • The strain exhibited optimal growth at 25°C and pH 7, was catalase-positive, oxidase-negative, and showed high resistance to gamma radiation (D10 > 2 kGy).
  • Chemotaxonomic analysis revealed major fatty acids C15:1 ω6c and C16:1 ω7c, and MK-8 as the major quinone.

Conclusions:

  • Strain 16F1LT represents a novel species of the genus Deinococcus based on integrated phylogenetic, genotypic, phenotypic, and chemotaxonomic data.
  • The proposed name for this novel species is Deinococcus sedimenti sp. nov.
  • The type strain is 16F1LT (=KCTC 33796T =JCM 31405T).