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Eight strains characterised as Gram-stain-positive, non-spore-forming and non-motile rods were isolated from samples collected from stone chambers of the Takamatsuzuka and Kitora tumuli in Asuka village, Nara Prefecture, Japan. Among them, one strain, T7528-3-6bT, was shown to form a novel lineage within the genus Microbacterium . The most closely phylogenetically related species to T7528-3-6bT was Microbacterium panaciterrae , with 97.8 % sequence similarity. The major isoprenoid quinones of T7528-3-6bT were MK-12, MK-13 and MK-11. The predominant cellular fatty acids for this isolate were anteiso-C15 : 0, anteiso-C17 : 0, iso-C16 : 0 and iso-C15 : 0. The diagnostic diamino acid of the peptidoglycan of this isolate was ornithine. Major polar lipids of the isolate were phosphatidylglycerol, diphosphatidylglycerol and an unknown glycolipid. The G+C content of the genomic DNA of this isolate was 70.1 mol%. On the basis of the results of physiological, biochemical and chemotaxonomic tests and molecular phylogenetic analysis, T7528-3-6bT is considered to represent a novel species of the genus Microbacterium , for which the name M. tumbae sp. nov. has been proposed. The type strain is T7528-3-6bT (=JCM 28836T=NCIMB 15039T). The results of comparisons of both phenotypic and genotypic (16S rRNA gene sequence) characteristics indicated that the remaining seven isolates were very closely related to Microbacterium shaanxiense . Although the sequence similarity between the two was 99.2 %, further detailed multifaceted comparisons are needed to determine their accurate taxonomic assignment.
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