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Erythrobacter insulae sp. nov., isolated from a tidal flat.

Sooyeon Park1, Siyu Chen1, Jung-Hoon Yoon1

  • 1Department of Food Science and Biotechnology, Sungkyunkwan University, Jangan-gu, Suwon, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology
|February 27, 2020
PubMed
Summary

A novel bacterial species, Erythrobacter insulae, was discovered in Yellow Sea tidal flats. This Gram-negative bacterium, strain JBTF-M21T, represents a new addition to the Erythrobacter genus, expanding our understanding of marine microbial diversity.

Keywords:
Erythrobacter insulaeTidal flatnovel speciespolyphasic taxonomy

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Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Marine Biology

Background:

  • The genus Erythrobacter comprises aerobic, Gram-negative bacteria found in various aquatic environments.
  • Understanding bacterial diversity in marine ecosystems is crucial for ecological and biotechnological applications.
  • Isolation and characterization of novel species contribute to the comprehensive classification of microbial life.

Purpose of the Study:

  • To isolate and characterize a novel bacterial strain from tidal flat sediment.
  • To determine the phylogenetic and genetic relationship of the isolate to the Erythrobacter genus.
  • To formally propose a new species within the Erythrobacter genus based on distinct phenotypic and genotypic characteristics.

Main Methods:

  • Isolation of strain JBTF-M21T from Yellow Sea tidal flat sediment.
  • Phylogenetic analysis based on 16S rRNA gene sequences.
  • Genomic analysis including Average Nucleotide Identity (ANI) and DNA-DNA hybridization (dDDH) values.
  • Determination of DNA G+C content, major ubiquinones, fatty acids, and polar lipids.

Main Results:

  • Strain JBTF-M21T, a Gram-staining-negative, aerobic, non-motile bacterium, was isolated.
  • Phylogenetic analysis placed JBTF-M21T within the Erythrobacter genus, with sequence similarities ranging from 97.0-98.4% to related type strains.
  • Low ANI (70.83-72.93%) and dDDH (18.0-18.8%) values, along with distinct phenotypic properties, differentiated JBTF-M21T from known Erythrobacter species.
  • The DNA G+C content was 57.0 mol%, and characteristic ubiquinone, fatty acid, and polar lipid profiles were identified.

Conclusions:

  • Strain JBTF-M21T represents a novel species within the genus Erythrobacter.
  • The proposed name for this new species is Erythrobacter insulae sp. nov.
  • This discovery expands the known diversity of the Erythrobacter genus in marine environments.