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KMID : 0545120030130061013
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Journal of Microbiology and Biotechnology
2003 Volume.13 No. 6 p.1013 ~ p.1017
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Symbiobacterium toebii sp. nov., Commensal Thermophile Isolated from Korean Compost
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SUNG, MOON-HEE
BAE, JIN-WOO/KIM, JOONG-JAE/KIM, KWANG/SONG, JAE-JUN/RHEE, SUNG-KEUN/JEON, CHE OK
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Abstract
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A thermophilic nonspore-forming rod isolated from hay compost in Korea was subjected to a taxonomic study. The microorganism, designated as SC- IT, was identified as a nitrate-reducing and nonmotile bacterium. Although the strain was negatively Gram-stained, a KOH test showed that the strain SC-1^(T) belonged to a Cram-positive species. Growth was observed between 45 and 70℃. The optimal growth temperature and pH were 60℃ and pH 7.5, respectively. The G＋C content of the genomic DNA was 65 mol% and the major quinone types were MK-6 and MK-7. A phylogenetic analysis based on 16s rDNA sequences revealed that the strain SC- 1´ was most closely related to Symbiohacteriurn thermophilum. However, the level of DNA-DNA relatedness between strain SC- I´ and the type strain for Symbiohacteriurn thermophilum was approximately 30%. Accordingly, on the basis of the phenotypic traits and molecular systematic data, the strain SC-I^(T) would appear to represent a new species within the genus Symbiobacterium. The type strain for the new species is named SC-1^(T) (=KCTC 0307BP^(T); DSM 15906^(T)).
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