Hymenobacter humicola sp. nov., isolated from soils in Antarctica
Language English Country Great Britain, England Media print
Document type Journal Article
- Keywords
- Antarctica, Hymenobacter humicola, identification, soil, taxonomy,
- MeSH
- Cytophagaceae classification isolation & purification MeSH
- DNA, Bacterial genetics MeSH
- Phosphatidylethanolamines chemistry MeSH
- Phospholipids chemistry MeSH
- Phylogeny * MeSH
- Glycolipids chemistry MeSH
- Fatty Acids chemistry MeSH
- Pigmentation MeSH
- Soil Microbiology * MeSH
- RNA, Ribosomal, 16S genetics MeSH
- Sequence Analysis, DNA MeSH
- Bacterial Typing Techniques MeSH
- Vitamin K 2 analogs & derivatives chemistry MeSH
- Base Composition MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Antarctic Regions MeSH
- Names of Substances
- DNA, Bacterial MeSH
- Phosphatidylethanolamines MeSH
- Phospholipids MeSH
- Glycolipids MeSH
- Fatty Acids MeSH
- menaquinone 7 MeSH Browser
- phosphatidylethanolamine MeSH Browser
- RNA, Ribosomal, 16S MeSH
- Vitamin K 2 MeSH
A set of three psychrotrophic bacterial strains was isolated from different soil samples collected at the deglaciated northern part of James Ross Island (Antarctica) in 2014. All isolates were rod-shaped, Gram-stain-negative, non-motile, catalase-positive and oxidase-negative, and produced moderately slimy red-pink pigmented colonies on Reasoner's 2A (R2A) agar. A polyphasic taxonomic approach based on 16S rRNA gene sequencing, whole-genome sequencing, automated ribotyping, MALDI-TOF MS, chemotaxonomy methods and extensive biotyping using conventional tests and commercial identification kits was applied to the isolates in order to clarify their taxonomic position. Phylogenetic analysis based on the 16S rRNA gene showed that all isolates belonged to the genus Hymenobacter with the closest relative being Hymenobacter aerophilus DSM 13606T, exhibiting 98.5 % 16S rRNA gene pairwise similarity to the reference isolate P6312T. Average nucleotide identity values calculated from the whole-genome sequencing data proved that P6312T represents a distinct Hymenobacter species. The major components of the cellular fatty acid composition were summed feature 3 (C16 : 1 ω7c/C16 : 1 ω6c), C16 : 1 ω5c, summed feature 4 (C17 : 1 anteiso B/iso I), C15 : 0 anteiso and C15 : 0 iso. The menaquinone system of strain P6312T contained MK-7 as the major respiratory quinone. The predominant polar lipids were phosphatidylethanolamine and an unidentified phospholipid. Moderate to minor amounts of three unidentified polar lipids, four unidentified aminophospholipids, one unidentified glycolipid and one unidentified phospholipid were also present. Based on the obtained results, we propose a novel species for which the name Hymenobacterhumicola sp. nov. is suggested, with the type strain P6312T (=CCM 8763T=LMG 30612T).
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