Saxibacter everestensis gen. nov., sp. nov., A Novel Member of the Family Brevibacteriaceae, Isolated from the North Slope of Mount Everest
2024
Tian, M. | Wu, S.Y. | Zhang, W. | Zhang, G.S. | Yu, X. | Wu, Y.J. | Jia, P.C. | Zhang, B.L. | Chen, T. | Liu, G.X.
We isolated and analyzed a novel, Gram-stain-positive, aerobic, rod-shaped, non-motile actinobacterium, designated as strain ZFBP1038ᵀ, from rock sampled on the north slope of Mount Everest. The growth requirements of this strain were 10–37℃, pH 4–10, and 0–6% (w/v) NaCl. The sole respiratory quinone was MK-9, and the major fatty acids were anteiso-C15:0 and iso-C17:0. Peptidoglycan containing meso-diaminopimelic acid, ribose, and glucose were the major cell wall sugars, while polar lipids included diphosphatidyl glycerol, phosphatidyl glycerol, an unidentified phospholipid, and an unidentified glycolipid. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ZFBP1038ᵀ has the highest similarity with Spelaeicoccus albus DSM 26341ᵀ (96.02%). Z FBP1038ᵀ formed a distinct monophyletic clade within the family Brevibacteriaceae and was distantly related to the genus Spelaeicoccus. The G + C content of strain ZFBP1038ᵀ was 63.65 mol% and the genome size was 4.05 Mb. Digital DNA–DNA hybridization, average nucleotide identity, and average amino acid identity values between the genomes of strain ZFBP1038ᵀ and representative reference strains were 19.3–25.2, 68.0–71.0, and 52.8–60.1%, respectively. Phylogenetic, phenotypic, and chemotaxonomic characteristics as well as comparative genome analyses suggested that strain ZFBP1038ᵀ represents a novel species of a new genus, for which the name Saxibacter gen. nov., sp. nov. was assigned with the type strain Saxibacter everestensis ZFBP1038ᵀ (= EE 014ᵀ = GDMCC1.3024ᵀ = JCM 35335ᵀ).
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