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Two Gram-positive, rod-shaped, moderately halophilic bacteria were isolated from a deep-sea carbonate rock at a methane cold seep in Kuroshima Knoll, Japan. These bacteria, strains IS-Hb4(T) and IS-Hb7(T), were spore-forming and non-motile. They were able to grow at temperatures as low as 9 degrees C and hydrostatic pressures up to 30 MPa. Based on high sequence similarity of their 16S rRNA genes to those of type strains of the genus Halobacillus, from 96.4 % (strain IS-Hb7(T) to Halobacillus halophilus NCIMB 9251(T)) to 99.4 % (strain IS-Hb4(T) to Halobacillus dabanensis D-8(T)), the strains were shown to belong to this genus. DNA-DNA relatedness values of 49.5 % and 1.0-33.0 %, respectively, were determined between strains IS-Hb4(T) and IS-Hb7(T) and between these strains and other Halobacillus type strains. Both strains showed the major menaquinone MK7 and L-orn-D-Asp cell-wall peptidoglycan type. Straight-chain C(16 : 0), unsaturated C(16 : 1)omega7c alcohol and C(18 : 1)omega7c and cyclopropane C(19 : 0) cyc fatty acids were predominant in both strains. The DNA G+C contents of IS-Hb4(T) and IS-Hb7(T) were respectively 43.3 and 42.1 mol%. Physiological and biochemical analyses combined with DNA-DNA hybridization results allowed us to place strains IS-Hb4(T) (=JCM 14154(T)=DSM 18394(T)) and IS-Hb7(T) (=JCM 14155(T)=DSM 18393(T)) in the genus Halobacillus as the respective type strains of the novel species Halobacillus profundi sp. nov. and Halobacillus kuroshimensis sp. nov.

Halobacillus profundi sp. nov. and Halobacillus kuroshimensis sp. nov., moderately halophilic bacteria isolated from a deep-sea methane cold seep