Abstract
A Gram stain-negative, aerobic, motile, and rod-shaped bacterium designated 176SS1-4T was isolated from the salt-field sea water. Strain 176SS1-4T grew well at 25 °C on marine agar. The taxonomic affiliation of the novel isolate was identified using the polyphasic approach. By comparative 16S rRNA gene sequence, it could be shown that strain 176SS1-4T branches within the family Rhodobacteraceae and class Alphaproteobacteria and is related to Histidinibacterium lentulum B17T (96.0% sequence similarity). The digital DNA–DNA hybridization and average nucleotide identity between strain 176SS1-4T and H. lentulum B17T was 19.2% and 77%. The genome comprises of 3,905,029 bp with a G + C content of 67.7 mol. Ubiquinone 10 (Q-10) was the major respiratory quinone. The major fatty acids were summed feature 8 (comprising C18:1 ω7c and/or C18:1 ω6c), C16:0, C19:0 cyclo ω8c, C18:0, and C18:1 ω6c 11-methyl and the major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylcholine. On the basis of the genotypic and phenotypic characteristics, strain 176SS1-4T can be placed as a novel species within the genus Histidinibacterium; the name Histidinibacterium aquaticum sp. nov. has been proposed, with type strain 176SS1-4T (= KACC 19891T = LMG 31032T).
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This research was supported by National Marine Biodiversity Institute of Korea (2021M01100) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1I1A3046479).
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The NCBI GenBank accession number for the 16S rRNA gene sequence and genome sequence of strain 176SS1-4T are MK040417 and VYQE01000000.
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Supplementary Fig. S2. Two-dimensional TLC of polar lipids of strain 176SS1-4T. The following spray reagents were used for detection: (A) molybdenum blue (Sigma) (for phospholipids); (B) 5% ethanolic molybdophosphoric acid (Sigma) (for total lipids); (C) ninhydrin (Sigma) (for aminolipids). Abbreviations: DPG, diphosphatidylglycerol; PG, phosphatidylglycerol; PC, phosphatidylcoline; AL, aminolipids (AL1, AL2); L, unidentified polar lipids (L1- L3) (PPTX 334 kb)
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Lee, KH., Park, JS. Histidinibacterium aquaticum sp. nov., Isolated from Salt-Field Sea Water. Curr Microbiol 79, 67 (2022). https://doi.org/10.1007/s00284-021-02688-2
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DOI: https://doi.org/10.1007/s00284-021-02688-2