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<p>A Gram-negative, aerobic, non-motile, ovoid bacterium, designated strain MF3-039<sup>T</sup>, was isolated from tidal mudflat sediment sampled in Gunsan, Republic of Korea. The strain formed yellow-pigmented colonies on marine agar and was positive for catalase and oxidase. It grew at temperatures ranging from 10 to 37&#xa0;°C (optimum, 25&#xa0;°C), pH levels from 6.0 to 9.0 (optimum, 7.0), and 0 to 7.0% (w/v) NaCl (optimum, 2.0%). Phylogenetic analysis of 16S rRNA gene sequences revealed that strain MF3-039<sup>T</sup> clustered within the genus <i>Altererythrobacter</i> (family <i>Erythrobacteraceae</i>), with closest sequence similarity to <i>Altererythrobacter insulae</i> KCTC 63421<sup>T</sup> (97.9%), <i>Altererythrobacter ishigakiensis</i> ATCC BAA-2084<sup>T</sup> (97.9%), <i>Altererythrobacter rubellus</i> NBRC 112769<sup>T</sup> (97.2%), and <i>Tsuneonella suprasediminis</i> KCTC 62388<sup>T</sup> (97.1%). The draft genome was 2.9 Mbp with a G + C content of 60%. Genomic comparisons indicated average nucleotide identity and digital DNA–DNA hybridisation values below 95% and 70%, respectively, with related <i>Altererythrobacter</i> species. Chemotaxonomic analysis revealed ubiquinone-10 as the primary respiratory quinone, C<sub>17:1</sub> <i>ω</i>6<i>c</i> and summed feature 8 (comprising C<sub>18:1</sub> <i>ω</i>7<i>c</i>/C<sub>18:1</sub> <i>ω</i>6<i>c</i>), and summed feature 3 (C<sub>16:1</sub> <i>ω</i>7<i>c</i>/C<sub>16:1</sub> <i>ω</i>6<i>c</i>) as predominant fatty acids, and diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, a sphingoglycolipid, an unidentified glycolipid, and an unidentified lipid as major polar lipids. The combination of phenotypic, chemotaxonomic, genomic, and phylogenetic features clearly distinguishes strain MF3-039<sup>T</sup> from existing genera within the family <i>Erythrobacteraceae</i>. On the basis of these polyphasic analyses, strain MF3-039<sup>T</sup> represents a novel genus and species, for which the name <i>Litorerythrobacter xanthomarinus</i> gen. nov., sp. nov. is proposed. The type strain is MF3-039<sup>T</sup> (= KEMB 23948<sup>T</sup> = KCTC 8705<sup>T</sup> = TBRC 19385<sup>T</sup>).</p>

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Litorerythrobacter xanthomarinus gen. nov., sp. nov., a novel marine bacterium with distinct phenotypic traits from tidal mudflat sediment

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Akila Kathiresan,
  • Hyung-Seop Kim,
  • Cong Li,
  • Ke Dong,
  • Sathiyaraj Srinivasan,
  • Sang-Seob Lee

摘要

A Gram-negative, aerobic, non-motile, ovoid bacterium, designated strain MF3-039T, was isolated from tidal mudflat sediment sampled in Gunsan, Republic of Korea. The strain formed yellow-pigmented colonies on marine agar and was positive for catalase and oxidase. It grew at temperatures ranging from 10 to 37 °C (optimum, 25 °C), pH levels from 6.0 to 9.0 (optimum, 7.0), and 0 to 7.0% (w/v) NaCl (optimum, 2.0%). Phylogenetic analysis of 16S rRNA gene sequences revealed that strain MF3-039T clustered within the genus Altererythrobacter (family Erythrobacteraceae), with closest sequence similarity to Altererythrobacter insulae KCTC 63421T (97.9%), Altererythrobacter ishigakiensis ATCC BAA-2084T (97.9%), Altererythrobacter rubellus NBRC 112769T (97.2%), and Tsuneonella suprasediminis KCTC 62388T (97.1%). The draft genome was 2.9 Mbp with a G + C content of 60%. Genomic comparisons indicated average nucleotide identity and digital DNA–DNA hybridisation values below 95% and 70%, respectively, with related Altererythrobacter species. Chemotaxonomic analysis revealed ubiquinone-10 as the primary respiratory quinone, C17:1 ω6c and summed feature 8 (comprising C18:1 ω7c/C18:1 ω6c), and summed feature 3 (C16:1 ω7c/C16:1 ω6c) as predominant fatty acids, and diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, a sphingoglycolipid, an unidentified glycolipid, and an unidentified lipid as major polar lipids. The combination of phenotypic, chemotaxonomic, genomic, and phylogenetic features clearly distinguishes strain MF3-039T from existing genera within the family Erythrobacteraceae. On the basis of these polyphasic analyses, strain MF3-039T represents a novel genus and species, for which the name Litorerythrobacter xanthomarinus gen. nov., sp. nov. is proposed. The type strain is MF3-039T (= KEMB 23948T = KCTC 8705T = TBRC 19385T).