Methylobacterium radiodurans sp. nov., a novel radiation-resistant Methylobacterium
2021
Maeng, Soohyun | Kim, Dong-Uk | Lim, Sangyong | Lee, Byoung-Hee | Lee, Ki-eun | Kim, Myungkyum | Srinivasan, Sathiyaraj | Bai, Jaewoo
A Gram-negative, aerobic, flagellated, rod-shaped, and pink-pigmented bacterium, strain 17Sr1-43 ᵀ, was isolated from a soil sample collected in Nowongu, Seoul, Korea. The isolate could grow at 18–37 °C (optimum, 28–30 °C), pH 6.0–8.0 (optimum, pH 7.0) and in the presence of 0–1.0% (w/v) NaCl (optimum, 0%) with aeration. The major cellular fatty acids were summed feature 8 (C₁₈:₁ ω7c and/or C₁₈:₁ ω6c) and summed feature 2 (iso-C₁₆:₁ I and/or C₁₄:₀ 3-OH). The predominant respiratory quinone was Q-10 and the major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phospholipid, and diphosphatidylglycerol. The G + C content of genomic DNA was 69.1 mol%. Strain 17Sr1-43 ᵀ was closely related to Methylobacterium gregans KACC 14808 ᵀ (98.4% 16S rRNA gene sequence similarity), Methylobacterium hispanicum KACC 11432 ᵀ (97.9%), and Methylobacterium phyllosphaerae CBMB27ᵀ (96.1%). The complete genome of strain 17Sr1-43 ᵀ contains essential genes related to DNA repair processes including bacterial RecBCD dependent pathway and UmuCD system. Based on the phenotypic, genotypic, and chemotaxonomic characteristics, strain 17Sr1-43 ᵀ represents a novel species in the genus Methylobacterium, for which the name Methylobacterium radiodurans sp. nov. is proposed. The type strain is strain 17Sr1-43 ᵀ (= KCTC 52906 ᵀ = NBRC 112875 ᵀ).
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