Summary auto-generated
This study reclassifies two actinomycete strains previously misidentified as Catellatospora species based on comprehensive polyphasic taxonomy. Using 16S rDNA sequence analysis, the researchers found that Catellatospora ferruginea and 'Catellatospora ishikariense' form a distinct phylogenetic cluster (bootstrap value 100%) separate from other Catellatospora members and the family Micromonosporaceae. Chemical analysis revealed diagnostic differences, including unique menaquinone composition MK-10(H',H)), characteristic fatty acid type 2d, and distinct cell-wall sugars. Morphological features such as poor sporulation and absence of globose bodies further distinguished these organisms. The two strains showed 99.2% 16S rDNA sequence similarity but only 41% DNA-DNA hybridization relatedness. Based on these findings, the authors propose a new genus Asanoa and describe two species: Asanoa ferruginea comb. nov. (type strain IMSNU 22009T) and Asanoa ishikariensis sp. nov. (type strain IMSNU 22004T). The genus description is emended to reflect its unique characteristics, and the original Catellatospora genus description is revised to exclude these misclassified taxa.
Key findings
- Catellatospora ferruginea and 'C. ishikariense' form a distinct phylogenetic clade within Micromonosporaceae with 100% bootstrap support, meriting classification as a new genus Asanoa
- The two strains possess diagnostic chemical characteristics including MK-10(H',H)) menaquinones, fatty acid type 2d, and specific cell-wall composition distinct from other Catellatospora members
- Despite 99.2% 16S rDNA sequence similarity, the two strains show only 41% DNA-DNA hybridization and differ physiologically, supporting designation as separate species within the new genus
- Morphological features including poor sporulation, absence of globose bodies, and orange colony color differentiate Asanoa from other Micromonosporaceae genera
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Abstract
The taxonomic position of Catellatospora ferruginea and 'Catellatospora ishikariense' was investigated by phylogenetic, chemotaxonomic and physiological characterization. The 16S rDNA sequences of the organisms were compared with those of members of the genus Catellatospora and other genera of the Micromonosporaceae and phylogenetic trees were inferred by using distance-matrix and parsimony methods. The organisms formed a distinct cluster within the radiation of this family that was supported by a high bootstrap value, of 100%. The nearest neighbours were members of the genera Catenuloplanes and Verrucosispora. The organisms were readily differentiated from all of the validly described genera of the family Micromonosporaceae by using a battery of chemical and morphological characters, and the name Asanoa gen. nov. is proposed. On the basis of phenotypic and DNA--DNA hybridization data, Asanoa ferruginea comb. nov. (type strain IMSNU 22009(T)=IFO 14496(T)=DSM 44099(T)) and Asanoa ishikariensis sp. nov. (type strain IMSNU 22004(T)=IFO 14551(T)) are described.