Hymenobacter taeanensis sp. nov., radiation resistant bacterium isolated from coastal sand dune

An aerobic, Gram-stain-negative, non-motile, non-spore-forming, rod-shaped, and light pink-colored bacterial strain, designated TS19 T , was isolated from a sand sample obtained from a coastal sand dune after exposure to 3 kGy of gamma radiation. Phylogenetic analysis based on the 16S rRNA gene sequences revealed that the isolate was a member of the genus Hymenobacter and was most closely related to H. wooponensis WM78 T (98.3% similarity). Strain TS19 T and H. wooponensis showed resistance to gamma radiation with D 10 values (i.e., the dose required to reduce the bacterial population by tenfold) of 7.3 kGy and 3.5 kGy, respectively. The genome of strain TS19 T consists of one contig with 4,879,662 bp and has a G + C content of 56.2%. The genome contains 3,955 protein coding sequences, 44 tRNAs, and 12 rRNAs. The predominant fatty acids of strain TS19 T were iso-C 15:0 , summed feature 4 (iso-C 17:1 I and/or anteiso-C 17:1 B), summed feature 3 (C 16:1 ω 6 c and/or C 16:1 ω 7 c ), and C 16:1 ω 5 c . The major polar lipids were phosphatidylethanolamine, and one unidentified aminophospholipid. The main respiratory quinone was menaquinone-7. Based on the phylogenetic, physiological, and chemotaxonomic characteristics, strain TS19 T represents a novel species, for which the name Hymenobacter taeanensis sp. nov. is proposed. The type strain is TS19 T (= KCTC 72897 T = JCM 34023 T ).