A Gram-stain-negative, rod-shaped, motile, facultatively aerobic and ivory-pigmented bacterium (designated strain LA-55T) was isolated from a river in the Republic of Korea. On the basis of 16S rRNA gene sequencing, strain LA-55T clustered with species of the genus Brevundimonas and was closely related to B revundimonas kwangchunensis KSL-102T (97.3 %), B revundimonas aurantiaca DSM 4731T (97.1 %), B revundimonas albigilva NHI-13T (97.0 %), B revundimonas balnearis FDRGB2bT (97.0 %) and Brevundimonas aveniformis DSM 17977T (97.0 %). The average nucleotide identity value between strain LA-55T and its closest-related strain was 74.1 %, indicating that strain LA-55T represents a novel species of the genus Brevundimonas. Growth occurred at 15-40 °C on Reasoner's 2A medium in the presence of 0-2 % NaCl (w/v) and at pH 6.0-8.0. The genomic DNA G+C content was 70.5 mol% and ubiquinone 10 (Q-10) was the major respiratory quinone. The major cellular fatty acids (>5 %) were C1 8 :1 ω6c and/or C1 8 :1 ω7c (summed feature 8), C16 : 0, C1 6 :1 ω6c and/or C1 6 :1 ω7c (summed feature 3) and C18 : 1 ω7c 11-methyl. The polar lipids consisted of phosphatidylglycerol, 1,2-di-O-acyl-3-O-[d-glucopyranosyl-(1→4)-α-d-glucopyranuronosyl]glycerol, 1,2-di-O-acyl-3-O-α-d-glucopyranuronosyl glycerol, unidentified aminolipid, unidentified phosphoglycolipid and unidentified lipids. Physiological and biochemical characteristics indicated that strain LA-55T represents a novel species of the genus Brevundimonas, for which the name Brevundimonas fluminis sp. nov. is proposed. The type strain is LA-55T (=KACC 19639T=LMG 30850T).
Keywords: 16S rRNA gene sequence; Brevundimonas fluminis; genome sequence; polyphasic taxonomy.