期刊
ENZYME AND MICROBIAL TECHNOLOGY
卷 45, 期 5, 页码 348-354出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2009.07.010
关键词
Xylanase; Thermomyces lanuginosus; Protein purification; Physicochemical characterisation; Heterologous expression
资金
- Alltech
A xylanase produced by Thermomyces lanuginosus 195 by solid state fermentation (SSF) was purified 9.3-fold from a crude koji extract, with a 7.6% final yield. The purified xylanase (with an estimated mass of 22 kDa by SDS-PAGE) retained 18% relative activity when treated for 10 min at 100 degrees C and approximately 90% relative activity when incubated at pH values ranging from 6 to 10. Xylanase activity in the purified preparation was significantly enhanced following treatment with manganese and potassium chlorides (p < 0.05) but significantly reduced by calcium, cobalt and iron (p < 0.05). The purified enzyme was also shown to be exclusively xylanolytic. The gene encoding xylanase activity from T. lanuginosus 195 was functionally expressed by Pichia pastoris. MALDI-ToF mass spectrometry and zymography were employed to confirm functional recombinant expression. Maximum xylanase titres were achieved following 120 h induction of the recombinant culture, yielding 26.8 U/mL Achieving functional protein expression facilitates future efforts to optimise the cultivation conditions for heterologous xylanase production. (c) 2009 Elsevier Inc. All rights reserved.
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