Abstract
A novel xylanase-producing thermophilic strain MT-1 was isolated from a deep-sea hydrothermal field in east Pacific. A xylanase gene encoding 331 amino-acid peptide from this isolate was cloned and expressed in Escherichiacoli. The recombinant xylanase exhibited maximum activity at 70°C and had an optimum pH of 7.0. It was active up to 90°C and showed activity over a wide pH ranging from 5.5 to 10.0. The crude xylanase presented similar properties in temperature and pH to those of the recombinant xylanase. The recombinant xylanase was stable in 1 mM of enzyme inhibitors (PMSF, EDTA, 2-ME or DTT) and in 0.1% detergents (Tween 20, Chaps or Triton X-100), whereas, it was strongly inhibited by sodium dodecyl sulfate (SDS) (1 mM). In addition, its catalytic function was stable in the presence of Li+, Na+ or K+. However, it was strongly inhibited by Ni2+, Mn2+, Co2+, Cu2+, Zn2+, Cd2+, Hg2+ and Al3+ (1 or 0.1 mM). The K m and V max of the recombinant xylanase for oat spelt xylan were calculated to be 1.579 mg/ml and 289 μmol/(min • mg), respectively. Our study, therefore, presented a rapid overexpression and purification of xylanase from deep-sea thermophile aimed at improving the enzyme yield for industrial applications and scientific research.
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This work was financially supported by the China Ocean Mineral Resources R & D Association (DY105-02-04-05) and the National Natural Science Foundation of China (40576076).
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Wu, S., Liu, B. & Zhang, X. Characterization of a recombinant thermostable xylanase from deep-sea thermophilic Geobacillus sp. MT-1 in East Pacific. Appl Microbiol Biotechnol 72, 1210–1216 (2006). https://doi.org/10.1007/s00253-006-0416-4
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DOI: https://doi.org/10.1007/s00253-006-0416-4