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Thalassobacillus hwangdonensis sp. nov., isolated from a tidal flat sediment

Korea Research Institute of Bioscience and Biotechnology

¹ E-mail: jhyoon{at}kribb.re.kr

A Gram-positive, endospore-forming, motile and rod-shaped bacterial strain, AD-1T, was isolated from a tidal flat sediment of the coast of Hwangdo in the Yellow Sea, Korea, and its taxonomic position was investigated by a polyphasic study. Strain AD-1T grew optimally at pH 7.0-7.5 and 40 °C and in the presence of 5-10 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequence showed that strain AD-1T is most closely related to the type strains of Thalassobacillus devorans (98.0 % sequence similarity) and Thalassobacillus cyri (97.8 %). Strain AD-1T had the cell-wall peptidoglycan based on meso-diaminopimelic acid and MK-7 as the predominant menaquinone. Major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and two unidentified lipids. Major fatty acids (> 10 % of total fatty acids) were iso-C15:0, iso-C17:0 and anteiso-C15:0. The DNA G+C content of strain AD-1T was 45.2 mol%. It appears to be reasonable to classify strain AD-1T in the genus Thalassobacillus, although there were differences in fatty acid profiles between strain AD-1T and two Thalassobacillus species. Differential phenotypic properties and genetic distinctiveness of strain AD-1T revealed that this strain is differentiated from two Thalassobacillus species. On the basis of the data presented, strain AD-1T represents a novel species within the genus Thalassobacillus, for which the name Thalassobacillus hwangdonensis sp. nov. is proposed. The type strain is AD-1T (= KCTC 13254T = CCUG 56607T).