Abstract
A pH-stable and protease-resistant xylanase (XynB119) was identified from Streptomyces sp. TN119, a strain isolated from the gut luminal contents of longhorned beetle (Batocera horsfieldi) larvae. Using the GC TAIL-PCR method, the 1,026-bp coding gene (xynB119) with 67.3% GC content was successfully cloned and expressed in Escherichia coli. It encodes a 341-residue polypeptide with a calculated molecular mass of 35.9 kDa, including a putative 41-residue signal peptide, a catalytic domain of glycosyl hydrolase (GH) family 11, a short Gly/Pro-rich linker, and a family 2 cellulose-binding domain (CBM 2). The deduced amino acid sequence is most similar to (61.9% identity) an endo-1,4-β-xylanase from Streptomyces thermoviolaceus OPC-520. Purified recombinant XynB119 exhibited peak activity at 50°C and pH 7.0, remained stable over a broad pH range (retaining >70% activity after incubation at pH 1.0–11.0 for 1 h at 37°C without substrate), had strong protease resistance (retaining >90% activity after proteolytic treatment at 37°C for 1 h) and SDS resistance (at 100 mM). These properties make XynB119 promising for application in the feed industry and valuable for basic research. Compared to r-XynB119, the r-XynB119 derivative without CBM 2 and linker region (r-XynB119d) exhibited a decreased pH stability of >25% at extreme pHs (pH 1.0–3.0 and pH 11.0–12.0).
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Acknowledgments
This research was supported by the Earmarked Fund for Modern Agro-industry Technology Research System (NYCYTX-42-G2-05), Key Program of Transgenic Plant Breeding (2009ZX08003-020B), and the National High Technology Research and Development Program of China (863 Program; grant 2007AA100601).
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Zhou, J., Shi, P., Zhang, R. et al. Symbiotic Streptomyces sp. TN119 GH 11 xylanase: a new pH-stable, protease- and SDS-resistant xylanase. J Ind Microbiol Biotechnol 38, 523–530 (2011). https://doi.org/10.1007/s10295-010-0795-5
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DOI: https://doi.org/10.1007/s10295-010-0795-5