Three endoxylanase genes were cloned from the thermophilic fungus Chaetomium thermophilum CBS 730.95. All genes contained the typical consensus sequence of family 11 glycoside hydrolases. Genomic copies of Ct xyn11A, Ct xyn11B, and Ct xyn11C were expressed in the filamentous fungus T. reesei under the control of the strong T. reesei cel7A (cellobiohydrolase 1, cbh1) promoter. The molecular masses of the Ct Xyn11A, Ct Xyn11B, and Ct Xyn11C proteins on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) were 27, 23, and 22 kDa, respectively. Ct Xyn11A was produced almost as efficiently as the homologous xylanase II from a corresponding single-copy transformant strain. Ct Xyn11B production level was approximately half of that of Ct Xyn11A. The amount of Ct Xyn11C was remarkably lower. Ct Xyn11A had the highest temperature optimum and stability of the recombinant xylanases and the highest activity at acid-neutral pH (pH 5–7). It was the most suitable for industrial bleaching of kraft pulp at high temperature.
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We thank Varpu Backman, Merja Helanterä, Sanna Hiljanen-Berg, Kirsti Leskinen, Outi Nikkilä, Jaana Oksanen, and Riitta Tarkiainen for skillful technical assistance. Sirpa Holm, Sirpa Okko, Elke Parkkinen, Auli Sinnemäki, and Tarja Sjöblom are thanked for performing the laboratory-scale fermentations. Nisse Kalkkinen is acknowledged for performing the peptide analyses and mass spectrometry. George Szakacs is acknowledged for kindly providing the C. thermophilum host strain and David Wilson for the T. fusca TfxA antibody. Nina Hakulinen and Richard Fagerström are thanked for useful discussions. John Londesborough is acknowledged for critically reading the manuscript and for correcting the language.
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Mäntylä, A., Paloheimo, M., Hakola, S. et al. Production in Trichoderma reesei of three xylanases from Chaetomium thermophilum: a recombinant thermoxylanase for biobleaching of kraft pulp. Appl Microbiol Biotechnol 76, 377–386 (2007). https://doi.org/10.1007/s00253-007-1020-y
- Xylanase Activity
- Kraft Pulp
- Kappa Number
- Thermophilic Fungus
- Xylanase Gene