Abstract
A gamma radiation-resistant, Gram-stain negative, oxidase and catalase positive, aerobic, flagellated, rod-shaped, methylotrophic and pink-pigmented bacterial strain designated 17SD2-17 T was isolated from gamma-ray-irradiated soil collected in Korea. The 16S rRNA gene sequence analysis showed that strain 17SD2-17 T is phylogenetically related to Methylobacterium organophilum DSM 760 T (97.6%), Methylobacterium oxalidis 35aT (97.4%) and Methylobacterium soli YIM 48816 T (97.0%). The G+C content calculated based on the draft genome sequence is 68.7 mol%. The DNA–DNA hybridisation between 17SD2-17 T and its close relatives was found to be less than 40%. The predominant fatty acid was identified as summed feature 8 (C18:1ω7c and/or C18:1ω6c) and the major respiratory quinone as Q-10. The major polar lipids were found to be diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine. On the basis of the data from phenotypic tests and genotypic differences between strain 17SD2-17 T and its close phylogenetic relatives, strain 17SD2-17 T is concluded to represent a new species belonging to the genus Methylobacterium, for which the name Methylobacterium durans sp. nov. (= KCTC 52908 T = NBRC 112876 T) is proposed.
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Acknowledgements
This work was supported by a research grant from Seoul Women’s University (2018), and the project on the survey of indigenous species of Korea, of the National Institute of Biological Resources (NIBR) funded by the Ministry of Environment (MOE).
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GC isolated the bacterium, designed the study, performed the phenotypic and biochemical characterization, wrote the original draft; JK, HK and IK helped the analysis of taxonomic data; MKK and TS designed and supervised the study, edited the original draft.
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Kim, J., Chhetri, G., Kim, I. et al. Methylobacterium durans sp. nov., a radiation-resistant bacterium isolated from gamma ray-irradiated soil. Antonie van Leeuwenhoek 113, 211–220 (2020). https://doi.org/10.1007/s10482-019-01331-2
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DOI: https://doi.org/10.1007/s10482-019-01331-2