A bacterial strain, PY2T, capable of oxidizing carbon monoxide, was isolated from a soil sample collected from a roadside at Yonsei University, Seoul, Korea. On the basis of 16S rRNA gene sequence analysis, strain PY2T was shown to belong to the genus Terrabacter and was most closely related to Terrabacter lapilli LR-26T (99.1 % similarity). Strain PY2T was characterized chemotaxonomically as having iso-C15 : 0 as the predominant fatty acid, MK-8(H4) as the major menaquinone, ll-diaminopimelic acid as the diagnostic diamino acid of the cell wall, as possessing a polar lipid profile that included diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol and unknown amino-containing phosphoglycolipids, and having a DNA G+C content of 75.6 mol%. DNA–DNA relatedness values between strain PY2T and the type strains of T. lapilli, Terrabacter tumescens, Terrabacter terrae and Terrabacter aerolatus were 20.0 %, 22.9 %, 35.9 % and 64.5 %, respectively. Based on the combined evidence from the phylogenetic analyses, chemotaxonomic data and DNA–DNA hybridization experiments, it is proposed that strain PY2T represents a novel species for which the name Terrabacter carboxydivorans sp. nov. is proposed. The type strain is PY2T (=KCCM 42922T=JCM 16259T).
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