Abstract
A xylanase gene, xynBS27, was cloned from Streptomyces sp. S27 and consisted of 693 bp encoding a 230-residue protein, including a putative 41-residue signal peptide. Belonging to the glycoside hydrolase family 11, XynBS27 exhibits the maximum identity (75.9%) to the xylanase from Streptomyces sp. zxy19. Recombinant XynBS27 was overexpressed in Pichia pastoris, and the xylanase activity was 7624.0 U/ml after high-cell-density fermentation in 3.7-L fermenter. The purified recombinant XynBS27 had a high specific activity of 3272.0 U/mg. The optimum temperature and pH for XynBS27 activity was 65 °C and pH 6.5, respectively. XynBS27 showed good pH stability and retained more than 80% of the maximum activity after incubation in buffers with pH ranging between 4.0 and 12.0 at 37 °C for 1 h. The main hydrolysis product of xylan by XynBS27 was xylobiose (>75%), which was good for human health derived from its ability to modulate the intestinal function. The attractive biochemical characteristics of XynBS27 suggest that it may be a good candidate in a variety of industrial applications.
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This work was supported by National High Technology Research and Development Program of China (863 Program; no. 2007AA100601) and National Key Technology R&D Program of China (no. 2006BAD12B05-03).
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Li, N., Shi, P., Yang, P. et al. Cloning, Expression, and Characterization of a New Streptomyces sp. S27 Xylanase for Which Xylobiose is the Main Hydrolysis Product. Appl Biochem Biotechnol 159, 521–531 (2009). https://doi.org/10.1007/s12010-008-8411-0
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DOI: https://doi.org/10.1007/s12010-008-8411-0