Euzebya rosea sp. nov., a rare actinobacterium isolated from the East China Sea and analysis of two genome sequences in the genus Euzebya

International Journal of Systematic and Evolutionary Microbiology
Qi YinYing Xu

Abstract

Rare Actinobacteria, known as non-Streptomyces, hold great potential to produce new bioactive compounds for drug development. A strain designated DSW09T, which belongs those rare Actinobacteria, was isolated from surface seawater of the East China Sea. The cells were aerobic, Gram-positive, non-motile, non-spore-forming and rod-shaped (0.4 µm wide and 1.5-4.0 µm long). The closest relative was Euzebya tangerina F10T (96.46 % of 16S rRNA gene similarity). Cell growth occurred at 15-45 °C (optimum, 25-30 °C), at pH 6.0-9.0 (pH 6.0-7.0) and at NaCl concentrations of 0.5-5.0 % (w/v; 1.0-4.0 %). The major cellular fatty acids were summed feature 3 (comprising C16 : 1ω7c and/or C15 : 0iso 2OH), C17 : 1ω8c and C16 : 0. The predominant polar lipid was diphosphatidylglycerol. The predominant menaquinone was MK-9(H4). The cell-wall peptidoglycan was A1 γ-type, containing meso-DPA. The major cell-wall sugars were rhamnose and ribose. The genome size was 5 509 297 bp with a 71.29 mol% G+C content for strain DSW09T, while 4 781 440 bp with a 68.87 mol% G+C content for E. tangerina F10T. The average nucleotide identity and digital DNA-DNA hybridization values between strain DSW09T and E. tangerina F10T were 73.44 % and 16.43 %, respectively....Continue Reading

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