Proposal of Umezawaea gen. nov., a new genus of the Actinosynnemataceae related to Saccharothrix, and transfer of Saccharothrix tangerinus Kinoshita et al. 2000 as Umezawaea tangerina gen. nov., comb. nov.

In the course of phylogenetic analyses of the taxa within the suborder Pseudonocardineae, it was observed that Saccharothrix tangerinus MK27-91 F2(T) was misplaced in the genus Saccharothrix. After a detailed examination of nucleotide signatures in the 16S rRNA gene sequence along with the morphological and chemotaxonomic characteristics of this strain, which are different from those of all species of Saccharothrix as well as the other genera within the suborder, it was concluded that this strain represents a new genus, for which the name Umezawaea gen. nov. is proposed. Pseudosporangia are produced on the aerial mycelium, the whole-cell sugar pattern consists of galactose, mannose and ribose, phosphatidylethanolamine, phosphatidylinositol and lyso-phosphatidylethanolamine are the predominant phospholipids and MK-9(H-4) is the predominant menaquinone. The type species of the proposed new genus is Umezawaea tangerina gen. nov., comb. nov., with the type strain MK27-91 F2(T) (=NRRL B-24463(T) =DSM 44720(T) = FERM P-16053(T) = jCM 10302(T) = NBRC 16184(T)).