Trebonia kvetii gen. nov., sp. nov., an acidophilic actinobacterium, and proposal of the new actinobacterial family Treboniaceae fam. nov.

A novel actinobacterial strain, designated 15TR583 ^T , was isolated from a waterlogged acidic soil collected near the town of Trebon, Czech Republic, and was subjected to a polyphasic taxonomic characterization. Phylogenetic analysis based on 16S rRNA gene and whole-genome sequences revealed that the organism forms an individual line of descent related to the order Streptosporangiales , class Actinomycetia . The strain shared highest 16S rRNA gene sequence similarity, yet of only 92.8%, with Actinocorallia aurea IFO 14752 ^T . The strain grew in white colonies of aerobic, Gram-stain-positive, unbranching substrate mycelium bearing single spores at hyphae tips. The major fatty acids (>10%) were iso-C _{16 : 0} , C _{16 : 0} , iso - C _{17 : 1} ω9 and 10-methyl-C _{17 : 0} . The fatty acid pattern differed from all patterns currently described for actinobacterial genera. The organism contained as major menaquinones MK9(H ₆ ) and MK9(H ₈ ), which differentiated it from other actinobacterial families. Polar lipids were composed of six unidentified glycolipids, an unidentified phosphoglycolipid, two unidentified phospholipids and two unidentified aminolipids. Whole-cell sugars contained galactose, xylose and arabinose as major components. The peptidoglycan type was A1γ meso -diaminopimelic acid. The genomic DNA G+C content was 69.7 mol%. The distinct phylogenetic position and unusual combination of chemotaxonomic characteristics justify the proposal of Trebonia gen. nov., with the type species Trebonia kvetii sp. nov. (type strain 15TR583 ^T =CCM 8942 ^T =DSM 109105 ^T ), within Treboniaceae fam. nov.