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International Journal of Systematic and Evolutionary Microbiology, Vol 52, 2251-2255, Copyright © 2002 by Society for General Microbiology
M. H. Sung, H. Kim, J. W. Bae, S. K. Rhee, C. O. Jeon, K. Kim, J. J. Kim, S. P. Hong, S. G. Lee, J. H. Yoon, Y. H. Park and D. H. Baek
Microbial Genomics Lab., Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon 305-600, Korea
A thermophilic, spore-forming rod isolated from hay compost in Korea was subjected to a taxonomic study. The micro-organism, designated strain SK-1(T), was identified as being aerobic, Gram-positive, motile and rod-shaped. Growth of the isolate was observed at 45--70 degrees C (optimum 60 degrees C) and pH 6.0--9.0 (optimum pH 7.5). The G+C content of the genomic DNA was 43.9 mol%. Chemotaxonomic characteristics of the isolate included the presence of meso-diaminopimelic acid in the cell wall and iso-C(15:0) and iso-C(17:0) as the major cellular fatty acids. The predominant isoprenoid quinone was MK-7. The chemotaxonomic characteristics of strain SK-1(T) were the same as those of the genus Geobacillus. Phylogenetic analysis based on 16S rDNA sequences showed that strain SK-1(T) is most closely related to Geobacillus thermoglucosidasius. However, the phenotypic properties of strain SK-1(T) were clearly different from those of G. thermoglucosidasius. The level of DNA--DNA relatedness between strain SK-1(T) and the type strain of G. thermoglucosidasius was 27%. On the basis of the phenotypic traits and molecular systematic data, strain SK-1(T) represents a novel species within the genus Geobacillus, for which the name Geobacillus toebii sp. nov. is proposed. The type strain is strain SK-1(T) (=KCTC 0306BP(T)=DSM 14590(T)).
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