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http://dx.doi.org/10.4014/mbl.1611.11002

Identification and Biochemical Characterization of Xylanase-producing Streptomyces glaucescens subsp. WJ-1 Isolated from Soil in Jeju Island, Korea  

Kim, Da Som (Biological and Genetic Resources Assessment Division, National Institute of Biological Resources)
Jung, Sung Cheol (Warm-temperature and Subtropical Forest Research Center, Korea Forest Research Institute)
Bae, Chang Hwan (Biological and Genetic Resources Assessment Division, National Institute of Biological Resources)
Chi, Won-Jae (Biological and Genetic Resources Assessment Division, National Institute of Biological Resources)
Publication Information
Microbiology and Biotechnology Letters / v.45, no.1, 2017 , pp. 43-50 More about this Journal
Abstract
A xylan-degrading bacterium (strain WJ-1) was isolated from soil collected from Jeju Island, Republic of Korea. Strain WJ-1 was characterized as a gram-positive, aerobic, and spore-forming bacterium. The predominant fatty acid in this bacterium was anteiso-$C_{15:0}$ (42.99%). A similarity search based on 16S rRNA gene sequences suggested that the strain belonged to the genus Streptomyces. Further, strain WJ-1 shared the highest sequence similarity with the type strains Streptomyces spinoveruucosus NBRC 14228, S. minutiscleroticus NBRC 13000, and S. glaucescens NBRC 12774. Together, they formed a coherent cluster in a phylogenetic tree based on the neighbor-joining algorithm. The DNA G+C content of strain WJ-1 was 74.7 mol%. The level of DNA-DNA relatedness between strain WJ-1 and the closest related species S. glaucescens NBRC 12774 was 85.7%. DNA-DNA hybridization, 16S rRNA gene sequence similarity, and the phenotypic and chemotaxonomic characteristics suggest that strain WJ-1 constitutes a novel subspecies of S. glaucescens. Thus, the strain was designated as S. glaucescens subsp. WJ-1 (Korean Agricultural Culture Collection [KACC] accession number 92086). Additionally, strain WJ-1 secreted thermostable endo-type xylanases that converted xylan to xylooligosaccharides such as xylotriose and xylotetraose. The enzymes exhibited optimal activity at pH 7.0 and $55^{\circ}C$.
Keywords
Xylanase; Streptomyces glaucescens; identification; characterization; phylogenetic analysis;
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