期刊
EXTREMOPHILES
卷 6, 期 1, 页码 57-64出版社
SPRINGER-VERLAG TOKYO
DOI: 10.1007/s007920100233
关键词
Symbiobacterium toebii; thermophile; symbiotic bacterium; compost; commensalism; microaerophilic
A symbiotic thermophilic bacterium, strain SC-1, was isolated from hay compost (toebi) in Korea. The new isolate exhibited an obligate commensal interaction with a thermophilic Geobacillus strain and required crude extracts and/or culture supernatant from Geobacillus sp. SK-1 for axenic growth. The growth factors from Geobacillus sp. SKI were irreversibly inactivated by phenol or protease treatment. suggesting that they might be proteins. The cells of strain SC-1 were non-spore forming, nonmotile rods that were stained Gram-negatively. The isolate was a microaerophilic heterotroph. Growth was observed between 45degrees and 70degreesC (optimum: 60degreesC; 2.4-h doubling time) and pH 6.0 and 9.0 (optimum: pH 7.5). The G+C content of the genomic DNA was 65 mol%, and the major quinones were MK-6 and MK-7. A phylogenetic analysis of its 16S rDNA sequence indicated that strain SC-1 is closely related to Symbiobacterium thermophilum and so was named Symbiobacterium toebii on the basis of its physiological and molecular properties.
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