Abstract
An alkaliphilic, moderately thermophilic and halophilic bacterial isolate capable of producing a high titer of extracellular thermo-alkali-stable, cellulase-free endoxylanase was isolated from the paper mill effluents. It was identified as Bacillus halodurans. The purified xylanase was active from pH 7 to 12 and 30 to 100°C with optimal activity at pH 9.0 and 80°C. It had T1/2 values of 40 and 15 min at 70 and 80°C, respectively. Activity was stimulated by dithiothreitol but strongly inhibited by N-bromosuccinimide. Its action on birchwood xylan and agro-residues liberated xylooligosaccharides of 2–7 degree of polymerization, and thus, the mode of action is similar to endoxylanases of the family 10 glucoside hydrolases.
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We are grateful to the Ministry of Environment & Forests and Department of Biotechnology, Government of India for providing financial assistance while carrying out the work presented in the manuscript.
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Kumar, V., Satyanarayana, T. Applicability of thermo-alkali-stable and cellulase-free xylanase from a novel thermo-halo-alkaliphilic Bacillus halodurans in producing xylooligosaccharides. Biotechnol Lett 33, 2279–2285 (2011). https://doi.org/10.1007/s10529-011-0698-1
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DOI: https://doi.org/10.1007/s10529-011-0698-1