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Nocardioides marinisabuli sp. nov., a novel actinobacterium isolated from beach sand

¹ Department of Science Education, Cheju National University, Jeju 690-756, Republic of Korea
² Laboratory for Microbial Diversity and Biotechnology, Jeju Biodiversity Research Institute and Jeju Hi-Tech Industry Development Institute, Jeju 690-121, Republic of Korea

Correspondence
Soon Dong Lee
sdlee{at}cheju.ac.kr

The taxonomic position of a novel actinobacterium (designated SBS-12^T), which was isolated from beach sand on Jeju Island, Republic of Korea, was determined following a polyphasic taxonomic characterization. Cells of the organism were Gram-positive, catalase-positive, oxidase-negative and non-motile rods. The organism contained LL-diaminopimelic acid in the cell-wall peptidoglycan and MK-8(H₄) as predominant menaquinone, and had a polar lipid profile containing phosphatidylglycerol and phosphatidylinositol, iso-C_{16 : 0} as the major fatty acid and a DNA G+C content of 73.1 mol%. A neighbour-joining tree based on 16S rRNA gene sequences showed that the organism occupies a distinct phylogenetic position within the radiation including representatives of the family Nocardioidaceae. High levels of 16S rRNA gene sequence similarity were found with Nocardioides kribbensis (97.2 %), Nocardioides aquiterrae (96.9 %), Nocardioides pyridinolyticus (96.6 %) and Nocardioides aquaticus (96.3 %). The combination of morphological and chemotaxonomic characteristics was consistent with classification in the genus Nocardioides, but the isolate can be differentiated from all Nocardioides species with validly published names by a range of physiological properties. The name Nocardioides marinisabuli sp. nov. is proposed for this novel organism, with the type strain SBS-12^T (=JBRI 2003^T=KCCM 42681^T=DSM 18965^T).

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