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Paracoccus angustae sp. nov., isolated from soil.

Xuelian Sun1, Patrick Luo2, Mingshun Li1

  • 1State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, PR China.

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Summary

A novel aerobic bacterium, Paracoccus angustae sp. nov. (strain E6T), was identified from soil. Genetic and phenotypic analyses confirm it as a distinct species within the Paracoccus genus.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Taxonomy

Background:

  • Soil harbors diverse microbial communities, including bacteria of the genus Paracoccus.
  • Accurate bacterial classification is crucial for understanding ecological roles and potential applications.

Purpose of the Study:

  • To characterize a novel bacterial isolate, strain E6T, from soil.
  • To determine the taxonomic position of strain E6T within the genus Paracoccus.

Main Methods:

  • Isolation and cultivation of aerobic, Gram-stain-negative cocci (strain E6T).
  • 16S rRNA gene sequence analysis for phylogenetic placement.
  • DNA–DNA hybridization for genetic relatedness assessment.
  • Analysis of phenotypic characteristics, including motility and carbon source utilization.
  • Determination of major fatty acids, respiratory quinones, polar lipids, and DNA G+C content.

Main Results:

  • Strain E6T showed 97.2% 16S rRNA gene similarity to Paracoccus sediminis CMB17T, but DNA–DNA relatedness was only 59.2%.
  • Distinct phenotypic traits, such as lack of motility and inability to utilize lactate/propionate, differentiate strain E6T from related Paracoccus species.
  • Major fatty acids were C18:1ω7c and C18:0; ubiquinone-10 was the sole respiratory quinone.
  • Genomic DNA G+C content was 68.1 mol%.

Conclusions:

  • Based on genotypic and phenotypic data, strain E6T represents a novel species within the genus Paracoccus.
  • The proposed name for this new species is Paracoccus angustae sp. nov.
  • The type strain is E6T (KCTC 42473T = CCTCC AB 2015056T).