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Lapillicoccus jejuensis gen. nov., sp. nov., a novel actinobacterium of the family Intrasporangiaceae, isolated from stone

Department of Science Education, Cheju National University, Jeju 690-756, Republic of Korea

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

A novel, yellow-pigmented actinobacterium was isolated from a small stone collected in Jeju, Republic of Korea. The cells of the organism, designated strain R-Ac013^T, were Gram-positive, aerobic, non-motile cocci that occurred singly or in pairs. The strain showed growth at 10–37 °C and pH 4.1–11.1, and tolerated 2 % NaCl. On the basis of the 16S rRNA gene sequence, the organism was phylogenetically related to members of the genera Tetrasphaera (94.6–97.1 % sequence similarity), Terrabacter (96.5 %), Knoellia (96.4 %), Terracoccus (96.4 %), Oryzihumus (96.4 %), Janibacter (96.1–96.4 %) and Intrasporangium (96.2 %). The chemotaxonomic results for the organism were as follows: LL-diaminopimelic acid as the diagnostic diamino acid in the peptidoglycan, acetyl-type murein, MK-8(H₄) as the major menaquinone, a DNA G+C content of 74.1 mol%, and a polar lipid profile that comprised diphosphatidylglycerol and phosphatidylinositol. The fatty acid profile consisted of iso- and anteiso-methyl-branched, straight-chain saturated and monounsaturated types, the major components being iso-C_{16 : 0}, C_{17 : 1}8c and iso-C_{15 : 0}. The combination of the phenotypic and phylogenetic data revealed that this strain represents a novel genus and species of the family Intrasporangiaceae, for which the name Lapillicoccus jejuensis gen. nov., sp. nov. is proposed. The type strain is strain R-Ac013^T (=KCTC 19200^T=DSM 18607^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain R-Ac013^T is AM398397.

A transmission electron micrograph of cells of strain R-Ac013^T is available as supplementary material with the online version of this paper.

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