Hymenobacter swuensis sp. nov., a Gamma-Radiation-Resistant Bacteria Isolated from Mountain Soil
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Gram stain-negative and non-motile bacteria, designated as DY53T and DY43, were isolated from mountain soil in South Korea prior exposure with 5 kGy gamma radiation. Phylogenetic analysis based on 16S rRNA gene sequence revealed that the strains belonged to the family Cytophagaceae in the class Cytophagia. 16S rRNA gene sequence similarity of strains DY53T and DY43 was 100 %. The highest degrees of sequence similarities of strains DY53T and DY43 were found with Hymenobacter perfusus A1-12T (98.8 %), Hymenobacter rigui WPCB131T (98.5 %), H. yonginensis HMD1010T (97.9 %), H. xinjiangensis X2-1gT (96.6 %), and H. gelipurpurascens Txg1T (96.5 %). The DNA G+C content of the novel strains DY53T and DY43 were 59.5 mol%. Chemotaxonomic data revealed that strains possessed major fatty acids such as C15:0 iso, C15:0 anteiso, C16:1 ω5c, summed feature 3 (16:1 ω7c/ω6c), summed feature 4 (17:1 anteiso B/iso I) and C17:0 iso, and major polar lipid was phosphatidylethanolamine. The novel strains showed resistance to gamma radiation, with a D10 value (i.e., the dose required to reduce the bacterial population by tenfold) in excess of 5 kGy. Based on these data, strains DY53T and DY43 should be classified as representing a novel species, for which the name Hymenobacter swuensis sp. nov. is proposed, with the type strain DY53T (=KCTC 32018T = JCM 18582T) and DY43 (=KCTC 32010).
KeywordsPhenyl Acetate Itaconate Major Polar Lipid Kocuria Polar Lipid Profile
We thank Dr. Jean Euzéby for checking the Latin etymology of species name and this work was supported by a special research grant from Seoul Women’s University (2013).
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