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Symbiobacterium toebii sp. nov., Commensal Thermophile Isolated from Korean Compost
SUNG, MOON-HEE,BAE, JIN-WOO,KIM, JOONG-JAE,KIM, KWANG,SONG, JAE-JUN,RHEE, SUNG-KEUN,JEON, CHE OK,CHOI, YOON-HO,HONG, SEUNG-PYO,LEE, SEUNG-GOO,HA, JAE SUK,KANG, GWAN TAE 한국미생물 · 생명공학회 2003 Journal of microbiology and biotechnology Vol.13 No.6
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)).