| Title | Aestuariibaculum marinum sp. nov., a marine bacterium isolated from seawater in South Korea |
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| Author | Jiwon Choi1, Dongwook Lee1, Jun Hyeong Jang1,2, Seho Cha1, and Taegun Seo1* |
| Address | 1Department of Life Science, Dongguk University-Seoul, Goyang 10326, Republic of Korea, 2Water Supply and Sewerage Research Division, National Institute of Environmental Research, Incheon 22689, Republic of Korea |
| Bibliography | Journal of Microbiology, 56(9),614–618, 2018, |
| DOI | 10.1007/s12275-018-8134-z |
| Key Words | DNA-DNA relatedness, Aestuariibaculum, taxonomy |
| Abstract | A Gram-negative, non-motile, aerobic bacterium, designated strain IP7T, was isolated from seawater at the shore of the Incheon Eulwang-ri beach, South Korea. Cells of strain IP7T are straight or slightly rod-shaped and colonies are round, convex and orange-yellow. Strain IP7T is flexirubin-negative, mild halophile, catalase- and oxidase-positive, and produces a yellow-orange carotenoid pigment. Growth is optimal at 30°C, pH 7–9, and 2.0–4.0% NaCl (w/v). On the basis of 16S rRNA gene sequence similarity, strain IP7T is affiliated with genus Aestuariibaculum in the family Flavobacteriaceae, the closest relative being Aestuariibaculum suncheonense SC17T (98.3% sequence similarity). The DNA G + C content of the novel strain is 37.4 mol%. The only quinone is MK-6 menaquinone. Iso-branched C15:0, iso-branched C15:1 G, and iso-branched C17:0 3-OH are major fatty acids. The major polar lipids are phosphatidylethanolamine, an unidentified aminoglycolipid and two unidentified glycolipids. The DNA-DNA hybridization value of strain IP7T with Aestuariibaculum suncheonense SC17T is 28.87%. Based on the collective DNA-DNA hybridization, biochemical, phylogenetic and physiological data, we report a novel species of the genus Aestuariibaculum for which the name Aestuariibaculum marinum sp. nov. is proposed. The type strain is IP7T (= KCTC 52521T = JCM 31725T). |