Mizugakiibacter sediminis gen. nov., sp. nov., isolated from a freshwater lake
2014
Kojima, Hisaya | Tokizawa, Riho | Fukui, Manabu
A novel, moderately thermophilic, bacterial strain (skMP5 ᵀ) was isolated from sediment of a freshwater lake in Japan. The cells were rod-shaped, motile and Gram-stain-negative. Growth was observed at temperatures ranging from 25 to 52 °C, with optimum growth observed at 48–50 °C. The pH range for growth was pH 5.0–8.2, with optimum growth at pH 6.0–7.0. The G+C content of genomic DNA was 72 mol%. The major components in the fatty acid profile were iso-C ₁₇ : ₀ and iso-C ₁₇ : ₁ω9 c . The predominant isoprenoid quinone of the strain was ubiquinone Q-8. The strain was facultatively anaerobic, and reduced nitrate to nitrite under anoxic conditions. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate was a member of the family Xanthomonadaceae within the class Gammaproteobacteria , showing highest sequence similarity with Tahibacter aquaticus RaM5-2 (93.6 %) and Metallibacterium scheffleri DKE6 ᵀ (93.3 %). On the basis of phylogenetic and phenotypic properties, strain skMP5 ᵀ represents a novel species of a new genus, Mizugakiibacter sediminis gen. nov., sp. nov. The type strain of the type species is skMP5 ᵀ (= DSM 27098 ᵀ = NBRC 109608 ᵀ).
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