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Tomitella Biformata Gen. Nov., Sp. Nov., A New Member Of The Suborder Corynebacterineae Isolated From A Permafrost Ice Wedge

Taiki Katayama, Tomoko Kato, Michiko Tanaka, Thomas A. Douglas, Anatoli Brouchkov, Ayumi Abe, Teruo Sone, Masami Fukuda, Kozo Asano

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Gram-reaction-positive, aerobic, non-spore-forming, irregular rod-shaped bacteria, designated AHU1821T and AHU1820, were isolated from an ice wedge in the Fox permafrost tunnel, Alaska. The strains were psychrophilic, growing at −5 to 27 °C. Phylogenetic analysis of the 16S rRNA and gyrB gene sequences indicated that the ice-wedge isolates formed a clade distinct from other mycolic-acid-containing bacteria within the suborder Corynebacterineae. The cell wall of strains AHU1821T and AHU1820 contained meso-diaminopimelic acid, arabinose and galactose, indicating chemotype IV. The muramic acids in the peptidoglycan were glycolated. The predominant menaquinone was MK-9(H2). The polar lipids consisted of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol, phosphatidylinositol mannosides and an unidentified glycolipid. The major fatty acids were hexadecenoic acid (C16 : 1), hexadecanoic acid (C16 : 0), octadecenoic acid (C18 : 1) and tetradecanoic acid (C14 : 0). Tuberculostearic acid was present in relatively small amounts (1 %). Strains AHU1821T and AHU1820 contained mycolic acids with 42–52 carbons. The DNA G+C content of the two strains was 69.3–71.6 mol% (T m). 16S rRNA, rpoB and recA gene sequences were identical between strains AHU1821T and AHU1820 and those of the gyrB gene showed 99.9 % similarity. Based on phylogenetic and phenotypic evidence, strains AHU1821T and AHU1820 represent a single novel species of a novel genus, for which the name Tomitella biformata gen. nov., sp. nov. is proposed. The type strain of Tomitella biformata is AHU1821T (=DSM 45403T =NBRC 106253T).