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  • Title: Methylobacterium terricola sp. nov., a gamma radiation-resistant bacterium isolated from gamma ray-irradiated soil.
    Author: Kim J, Chhetri G, Kim I, Lee B, Jang W, Kim MK, Seo T.
    Journal: Int J Syst Evol Microbiol; 2020 Apr; 70(4):2449-2456. PubMed ID: 32100693.
    Abstract:
    A gamma radiation-resistant and pink-pigmented bacterial strain, designated as 17Sr1-39T, was isolated from a gamma ray-irradiated soil sample collected in the Republic of Korea. Cells were Gram-stain-negative, strictly aerobic, flagellated, asporogenous, rod-shaped and methylotrophic. Results of 16S rRNA gene sequence analysis showed that strain 17Sr1-39T was phylogenetically related to Methylobacterium currus PR1016AT (97.3 %), Methylobacterium aquaticum DSM 16371T (97.2 %), Methylobacterium platani PMB02T (97.0 %), Methylobacterium frigidaeris IER25-16T (96.6 %), Methylobacterium terrae 17Sr1-28T (96.6 %) and Methylobacterium organophilum JCM 2833T (93.4 %). The G+C content calculated based on the genome sequence was 70.4 mol%. The average nucleotide identity and in silico DNA-DNA hybridization values between strain 17Sr1-39T and M. currus, M. aquaticum, M. platani, M. frigidaeris, M. terrae and M. organophilum were 77.3-89.9 and 22-38.2 %, respectively. The predominant fatty acids were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c) and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The predominant quinone was ubiquinone 10 and the major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine. Based on the data from phenotypic tests and genotypic differences between strain 17Sr1-39T and its close phylogenetic relatives, strain 17Sr1-39T represented a new species belonging to the genus Methylobacterium, for which the name Methylobacterium terricola sp. nov. (=KACC 52905T=NBRC 112874T) is proposed.
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