The generic position of an actinomycete strain, 'Pseudonocardia sp.' IMSNU 22139, was investigated by the phylogenetic analysis of 16S rDNA sequence. Comparative studies of 16S rDNA sequences indicated that this organism consistently formed a distinct clade within the radiation of the genus Amycolatopsis of the family Pseudonocardiaceae. This organism was also found to have chemotaxonomic properties consistent with those of the genus Amycolatopsis, which were represented by a type IV cell wall (meso-diaminopimelic acid, arabinose and galactose), a major menaquinone of MK-9(H4), a predominant fatty acid of 14-methylpentadecanoic acid, phosphatidylmethylethanolamine as a diagnostic phospholipid (a phospholipid type PII pattern) and DNA base composition of 68.5 mol% G+C. On the basis of physiological properties, cellular fatty acid profiles and its unique phylogenetic position, this organism is readily differentiated from all of the validly described species of the genus Amycolatopsis, and the name Amycolatopsis albidoflavus sp. nov. is proposed for it. The type strain is IMSNU 22139T (= KCTC 9471T = ATCC 53205T).


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