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<p>A yellow-pigmented, non-motile, rod-shaped, and Gram-stain-negative bacterium was isolated from the soil of Yeongheung Island, Korea. The novel isolate, strain N803<sup>T</sup>, was strictly aerobic, grew optimally at 30–35&#xa0;°C, at pH 6.5, and in the presence of 0–2% NaCl. The closest phylogenetic relatives of strain N803<sup>T</sup> are <i>Niabella ginsengisoli</i> GR10-1<sup>&#xa0;T</sup> (97.6%), <i>Niabella yanshanensis</i> CCBAU 05354<sup>&#xa0;T</sup> (96.2%), <i>Niabella aquatica</i> RP-2<sup>&#xa0;T</sup> (96.2%), <i>Niabella hibiscisoli</i> THG-DN5.5<sup>&#xa0;T</sup> (96.1%). The digital DNA-DNA hybridization (dDDH) and Average Nucleotide Identity (ANI) value between strain N803<sup>T</sup> and nearest relatives <i>N. gingsengisoli</i> were 18.9 and 73.8%, respectively, which were below the 70% dDDH and 95% ANI for <i>Niabella</i> species denineation. The DNA G + C content was obtained from the whole-genome sequence was 44.6% and the principal respiratory quinone was MK-7. The predominant cellular fatty acids were iso-C15: 0, iso-C15: 1 G, C17:0 3OH, and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c). The flexirubin pigment of strain showed antioxidant activity, tyrosinase inhibition and ultraviolet protective effects. On the basis of evidence from our polyphasic taxonomic study, strain N803<sup>T</sup> was classified into a novel species in the genus <i>Niabella</i>, for which the name <i>Niabella insulamsoli</i> sp. nov., has been proposed. The type strain is N803<sup>T</sup> (= KACC 23747<sup>&#xa0;T</sup> = NBRC 116942<sup>&#xa0;T</sup>).</p>

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Niabella insulamsoli sp. nov., Isolated From Soil and Showing Potential Cosmetic Functions with Flexirubin Extract

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Nhi Thi Ai Nguyen,
  • Jaisoo Kim

摘要

A yellow-pigmented, non-motile, rod-shaped, and Gram-stain-negative bacterium was isolated from the soil of Yeongheung Island, Korea. The novel isolate, strain N803T, was strictly aerobic, grew optimally at 30–35 °C, at pH 6.5, and in the presence of 0–2% NaCl. The closest phylogenetic relatives of strain N803T are Niabella ginsengisoli GR10-1 T (97.6%), Niabella yanshanensis CCBAU 05354 T (96.2%), Niabella aquatica RP-2 T (96.2%), Niabella hibiscisoli THG-DN5.5 T (96.1%). The digital DNA-DNA hybridization (dDDH) and Average Nucleotide Identity (ANI) value between strain N803T and nearest relatives N. gingsengisoli were 18.9 and 73.8%, respectively, which were below the 70% dDDH and 95% ANI for Niabella species denineation. The DNA G + C content was obtained from the whole-genome sequence was 44.6% and the principal respiratory quinone was MK-7. The predominant cellular fatty acids were iso-C15: 0, iso-C15: 1 G, C17:0 3OH, and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c). The flexirubin pigment of strain showed antioxidant activity, tyrosinase inhibition and ultraviolet protective effects. On the basis of evidence from our polyphasic taxonomic study, strain N803T was classified into a novel species in the genus Niabella, for which the name Niabella insulamsoli sp. nov., has been proposed. The type strain is N803T (= KACC 23747 T = NBRC 116942 T).