1887

Abstract

Two Gram-stain-positive, aerobic, pink, curved, rod-shaped, non-motile bacterial strains, designated MI-28 and SKY-11, were isolated from freshwater samples taken from a river and fish pond, respectively. Based on characterization using a polyphasic approach, the two strains showed highly similar phenotypic, physiological and genetic profiles. They demonstrated 99.9 % 16S rRNA gene sequence similarity and a 93–95 % DNA-DNA relatedness value, suggesting that they represent a single genomic species. Phylogenetic analyses, based on 16S rRNA gene sequences, showed that strains MI-28 and SKY-11 form a distinct lineage with respect to closely related genera within the family of the class , which is most closely related to and , and levels of 16S rRNA gene sequence similarity with the type species of related genera were less than 95 %. Cell-wall analysis showed that the peptidoglycan contained 2,4-diaminobutyric acid, alanine, glycine and glutamic acid. The predominant fatty acids were iso-C, anteiso-C and iso-C. The polar lipid profile consisted of a mixture of phosphatidylglycerol, diphosphatidylglycerol, an uncharacterized glycolipid and an uncharacterized aminophospholipid. The major polyamine was putrescine. The major isoprenoid quinone was MK-10. The G+C content of DNA was between 62.6 and 62.9 mol%. On the basis of the genotypic and phenotypic data, strains MI-28 and SKY-11 represent a novel genus and species of the family , for which the name gen. nov., sp. nov. is proposed. The type strain of the type species is MI-28 (=BCRC 80688=LMG 27848=KCTC 29239).

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2017-07-01
2022-01-29
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