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Ornithinimicrobium algicola sp. nov., a marine actinobacterium isolated from the green alga of the genus Ulva.

A Gram-staining-positive, non-spore-forming actinobacterium, strain JC311T, isolated from marine green alga of the genus Ulva was studied to examine its taxonomic position. On the basis of the 16S rRNA gene sequence similarity studies, strain JC311T was shown represent a member of the genus Ornithinimicrobium and to be closely related to Ornithinimicrobium pekingense LW6T (98.6 %), Ornithinimicrobium kibberense K22-20T (98.3 %) and Ornithinimicrobium humiphilum HKI 0124T (98.1 %). However, strain JC311T showed less than 22 % DNA reassociation value (based on DNA-DNA hybridization) with O. pekingense JCM14001T, O. kibberense JCM12763T and O. humiphilum KCTC19901T. The predominant menaquinone of strain JC311T was MK-8(H4). The peptidoglycan contained l-ornithine as the diagnostic diamino acid. The polar lipid profile consisted of the lipids diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, glycophospholipid, aminophospholipid, phospholipid and two unidentified lipids. The major fatty acids iso-C16 : 0, iso-C15 : 0, iso-C17 : 1ω9c and iso-C17 : 0 were consistent with the fatty acid patterns reported for members of the genus Ornithinimicrobium. The distinct genomic, morphological, physiological and chemotaxonomic differences from the previously described taxa support the classification of JC311T as a representative of a novel species of the genus Ornithinimicrobium, for which we propose the name Ornithinimicrobium algicola sp. nov., with the type strain JC311T ( = KCTC 39559 T =  LMG 28808T).