Bacillus encimensis sp. nov. isolated from marine sediment

Abstract

A Gram-stain-positive, rod-shaped, endospore-forming, aerobic bacterium designated SGD-V-25T was isolated from Veraval sediment sample, India. Strain SGD-V-25T was capable of growing at 25–50 °C (optimum 37 °C), pH 6–12 (optimum pH 7.0) and with 0–5 % (w/v) NaCl. The taxonomic position of this strain was deduced using a polyphasic approach and the 16S rRNA gene sequence analysis showed that the isolate belongs to the phylum Firmicutes , forming the cluster with Bacillus badius MTCC 1548T, with which it shares highest similarity of 99.1 % with 13 nt differences. Other type strains of the genus Bacillus showed less than 96 % similarity. The cell wall contained meso-diaminopimelic acid as the diagnostic diamino acid. The polar lipid profile of strain SGD-V-25T showed the presence of diphosphatidylglycerol, phosphatidylglycerol, phsophoglycolipid and two aminophospholipids. The predominant isoprenoid quinone was MK-7. The major cellular fatty acids were iso-C15 : 0, anteiso-C15 : 0, anteiso-C17 : 0, iso-C16 : 0, C16 : 1ω11c and C16 : 0. The genomic DNA G+C content of strain SGD-V-25T was 37.6 mol%. On the basis of phenotypic characteristics, phylogenetic analysis and DNA–DNA hybridization, strain SGD-V-25T could be clearly distinguished from closely related members of the genus Bacillus , and the name Bacillus encimensis sp. nov., is proposed to accommodate this strain. The type strain is SGD-V-25T ( = NCIM 5513T = DSM 28241T).