A novel xylan-degrading bacterium, YB-45, was isolated from forest soil. The organism is a facultatively anaerobic, Gram-variable, motile, endospore-forming, rod-shaped bacterium. It grew optimally at 37 °C and pH 7.5 in the presence of 3 % (w/v) NaCl. The predominant cellular fatty acids were anteiso-C, iso-C and C. The DNA G+C content was 51.7 mol% and the predominant menaquinone was MK-7. Growth was observed with many carbohydrates, including xylan, as sole carbon sources. Strain YB-45 produces a wide variety of hydrolytic enzymes, such as xylanase, cellulase, amylase, -mannanase, -mannosidase, -xylosidase, -galactosidase, -galactosidase and -glucosidase. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain YB-45 belongs to the genus , sharing sequence similarity that was <96 %. It was related most closely to DSM 13815, with 95.7 % sequence similarity. On the basis of morphological, chemotaxonomic, physiological and phylogenetic properties, strain YB-45 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is YB-45 (=KCTC 3953=DSM 16971).


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