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Humicoccus flavidus gen. nov., sp. nov., isolated from soil

Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Republic of Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

A Gram-positive, non-motile, spherical, non-spore-forming bacterial strain, DS-52^T, was isolated from soil from Dokdo, Korea, and its taxonomic position was investigated by using a polyphasic approach. It grew optimally at 25 °C and pH 6.0–7.0. Strain DS-52^T had meso-diaminopimelic acid as the diagnostic diamino acid in the cell-wall peptidoglycan, and galactose, mannose, xylose and rhamnose as whole-cell sugars. It contained MK-8(H₄) and MK-9(H₄) as the predominant menaquinones and anteiso-C_{15 : 0}, iso-C_{15 : 0} and C_{17 : 0} as major fatty acids. Major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine and phosphatidyldimethylethanolamine. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain DS-52^T is most closely related to the genus Nakamurella of the suborder Frankineae. Strain DS-52^T exhibited 16S rRNA gene sequence similarity values of 96.5 % to Nakamurella multipartita JCM 9543^T and 92.0–93.9 % to other members of the suborder Frankineae. The diagnostic diamino acid type and polar lipid profile of strain DS-52^T were the same as those of the genus Nakamurella. However, strain DS-52^T could be clearly distinguished from the genus Nakamurella by differences in predominant menaquinones, major fatty acids and cell-wall sugars. Accordingly, based on combined phenotypic, chemotaxonomic and phylogenetic data, strain DS-52^T (=KCTC 19127^T=CIP 108919^T) is proposed as the type strain of a novel species in a new genus, Humicoccus flavidus gen. nov., sp. nov.

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