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An Optimized Enrichment Technique for the Isolation of Arthrobacter Bacteriophage Species from Soil Sample Isolates
Published on: April 9, 2015
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Arthrobacter horti sp. nov., isolated from mountain soil
1Department of Life Science, College of Natural Sciences, Kyonggi University, Suwon, Kyonggi-Do 16227, Republic of Korea.
Summary
A novel Gram-positive bacterium, Arthrobacter horti sp. nov., was identified in South Korea. This new Arthrobacter species shows antimicrobial activity against Bacillus subtilis and Escherichia coli.
Area of Science:
- Microbiology
- Bacterial Taxonomy
- Genomics
Background:
- Isolation of Gram-positive, aerobic, rod-shaped bacteria, designated YJM1T and YJM12S, from Maebong Mountain, Republic of Korea.
- Characterization of growth parameters including temperature (5–35°C), pH (6–9), and salinity (0–4% NaCl).
Purpose of the Study:
- To taxonomically classify novel bacterial isolates.
- To determine the phylogenetic placement of strains YJM1T and YJM12S within the genus *Arthrobacter*.
- To propose a new species designation based on comprehensive data.
Main Methods:
- 16S rRNA gene sequencing for phylogenetic analysis.
- Chemotaxonomic analysis including polar lipid and major fatty acid profiling.
- Whole genome sequencing for DNA G+C content determination.
- Average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) calculations.
Main Results:
- Highest 16S rRNA gene sequence similarity (98.3%) to *Arthrobacter nanjingensis* A33T.
- DNA G+C content of strain YJM1T was 68.3 mol%.
- ANI and dDDH values indicated distinctness from related *Arthrobacter* species.
- Strain YJM1T demonstrated antimicrobial activity against *Bacillus subtilis* and *Escherichia coli*.
Conclusions:
- The combined genotypic, chemotaxonomic, and phenotypic data support the classification of strain YJM1T as a novel species.
- The proposed name for the novel species is *Arthrobacter horti* sp. nov.
- The type strain is YJM1T (=KACC 23300T=JCM 36483T).
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