Heterologous Expression and Characterization of an Acidic GH11 Family Xylanase from Hypocrea orientalis

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Abstract

A gene encoding glycoside hydrolase family 11 xylanase (HoXyn11B) from Hypocrea orientalis EU7–22 was expressed in Pichia pastoris with a high activity (413 IU/ml). HoXyn11B was partly N-glycosylated and appeared two protein bands (19–29 kDa) on SDS-PAGE. The recombinant enzyme exhibited optimal activity at pH 4.5 and 55 °C, and retained more than 90% of the original activity after incubation at 50 °C for 60 min. The determined apparent Km and Vmax values using beechwood xylan were 10.43 mg/ml and 3246.75 IU/mg, respectively. The modes of action of recombinant HoXyn11B on xylo-oligosaccharides (XOSs) and beechwood xylan were investigated by thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC), and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), which indicated that the modes of action of HoXyn11B are different from HoXyn11A since it is able to release a significant amount of xylose from various substrates. This study provides an opportunity to better understand the hydrolysis mechanisms of xylan by xylanases from Trichoderma.

Keywords

Heterologous expression Pichia pastoris Xylan hydrolysis Xylanases Hypocrea orientalis Xylo-oligosaccharides 

Notes

Acknowledgements

This work was supported by the Natural Science Foundation of Guangdong Province, China (2016A030310124); the National Natural Science Foundation of China (Grant No. 31600475); the project of Guangzhou Science and Technology (201707010241); the research fund from the Xiamen Southern Oceanographic Center (No. 14GZP59HJ29); Fujian Provincial Department of Ocean and Fisheries (No. 2015-27); and President Fund of Xiamen University (20720150090).

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  • Hailong Li
    • 1
    • 3
    • 4
  • Hongli Wu
    • 2
  • Fengjiao Jiang
    • 2
  • Jinlian Wu
    • 2
  • Yong Xue
    • 2
  • Lihui Gan
    • 2
  • Jian Liu
    • 2
  • Minnan Long
    • 2
  1. 1.Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhouPeople’s Republic of China
  2. 2.College of EnergyXiamen UniversityXiamenPeople’s Republic of China
  3. 3.CAS Key Laboratory of Renewable EnergyGuangzhouPeople’s Republic of China
  4. 4.Guangdong Provincial Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhouPeople’s Republic of China

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