Aestuariibaculum marinum sp. nov., a marine bacterium isolated from seawater in South Korea

Jiwon Choi; Dongwook Lee; Jun Hyeong Jang; Seho Cha; Taegun Seo

doi:10.1007/s12275-018-8134-z

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Aestuariibaculum marinum sp. nov., a marine bacterium isolated from seawater in South Korea: Jiwon Choi ¹, Dongwook Lee ¹, Jun Hyeong Jang ^1,2, Seho Cha ¹, Taegun Seo ¹; Journal of Microbiology 2018;56(9):614-618.
DOI: https://doi.org/10.1007/s12275-018-8134-z
Published online: August 23, 2018

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 Korea¹Department 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

Corresponding author: Taegun Seo , Tel: +82-31-961-5135;,

Received: 13 March 2018 • Revised: 24 May 2018 • Accepted: 29 May 2018

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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).

Keywords: DNA-DNA relatedness;Aestuariibaculum;taxonomy

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Aestuariibaculum marinum sp. nov., a marine bacterium isolated from seawater in South Korea

J. Microbiol. 2018;56(9):614-618. Published online August 23, 2018

DOI: https://doi.org/10.1007/s12275-018-8134-z

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