An extremely thermostable xylanase from the thermophilic eubacterium <i>Thermotoga</i>

DOI PDF 被引用文献3件
  • H D Simpson
    Thermophile and Microbial Biochemistry and Biotechnology Unit, Department Biological Sciences, University of Waikato, Private Bag 3105, Hamilton, New Zealand.
  • U R Haufler
    Thermophile and Microbial Biochemistry and Biotechnology Unit, Department Biological Sciences, University of Waikato, Private Bag 3105, Hamilton, New Zealand.
  • R M Daniel
    Thermophile and Microbial Biochemistry and Biotechnology Unit, Department Biological Sciences, University of Waikato, Private Bag 3105, Hamilton, New Zealand.

書誌事項

公開日
1991-07-15
DOI
  • 10.1042/bj2770413
公開者
Portland Press Ltd.

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<jats:p>Endo-1,4-beta-xylanase (EC 3.2.1.8) was isolated from the culture supernatant of Thermotoga sp. strain FjSS3-B.1, an extremely thermophilic anaerobic eubacterium which grows optimally at 80 degrees C. Activity was purified 165-fold by anion-exchange and hydroxyapatite chromatography. The enzyme has an Mr of 31,000 as determined by SDS/PAGE and 35,000 by analytical gel filtration. The optima for activity and stability for purified xylanase were between pH 5.0 and 5.5. At pH 5.5, which is the optimum pH for thermostability, t1/2 (95 degrees C) is 90 min. The thermostability was improved by immobilization of the xylanase on to porous glass beads; t1/2 (105 degrees C) is 10 min. Several additives, such as sorbitol and xylan, were also found to increase the thermostability. At 130 degrees C, the half-life of immobilized xylanase in the presence of 90% sorbitol was 1.3 min. At 130 degrees C in molten sorbitol half of the enzyme denatured rapidly, but the remainder appeared to have a half-life of about 60 min.</jats:p>

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