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Applied Biochemistry and Biotechnology

, Volume 174, Issue 4, pp 1246–1259 | Cite as

Genome Shuffling of Aspergillus glaucus HGZ-2 for Enhanced Cellulase Production

  • Yuping ZhaoEmail author
  • Changxing Jiang
  • Hupeng Yu
  • Fang Fang
  • Jingzhu Yang
Article

Abstract

The production of cellulase from Aspergillus glaucus HGZ-2 was improved by using genome shuffling. The starting populations, obtained by UV irradiation, were subjected to recursive protoplast fusion. The optimal conditions for protoplast formation and regeneration were 7 mg/ml snailase and 5 mg/ml cellulase at 34 °C for 3.0 h using 0.7 M NaCl as an osmotic stabilizer. The protoplasts were inactivated under UV for 30 min or heated at 50 °C for 50 min, and a fusant probability of about 100 % was observed. The positive colonies were created by fusing the inactivated protoplasts. The optimal conditions for protoplast fusion were PEG6000 concentration of 35 %, CaCl2 concentration of 0.02 M, and incubation time of 12 min. After two rounds of genome shuffling, one strain (Y) was obtained. Its filter paper cellulase (FPase) and carboxymethyl cellulase (CMCase) activity reached 71 and 70 U/ml, respectively, which were increased by 1.95-fold and 1.72-fold in comparison with that of its ancestor strain. The results indicated that genome shuffling was an efficient means for the improved production of cellulases by A. glaucus HGZ-2.

Keywords

Genome shuffling Cellulase production Aspergillus glaucus 

Notes

Acknowledgments

This work was financially supported by the Open Research Fund of Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, P.R. China (no. JSBGFC12004), the Jiangsu Key Technology Research and Development Program, P.R. China (no. BE2010357 and no. BE2013375), and Jiangsu University Research Industry Promotion Program, P.R. China (no. JHB2011-58).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yuping Zhao
    • 1
    • 2
    • 3
    Email author
  • Changxing Jiang
    • 1
    • 3
  • Hupeng Yu
    • 1
  • Fang Fang
    • 1
  • Jingzhu Yang
    • 1
  1. 1.School of Life Science and Chemical EngineeringHuaiyin Institute of TechnologyHuaianPeople’s Republic of China
  2. 2.Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, College of Chemical EngineeringNanjing Forestry UniversityNanjingPeople’s Republic of China
  3. 3.Jiangsu Provincial Engineering Laboratory for Biomass Conversion and Process IntegrationHuaiyin Institute of TechnologyHuaianPeople’s Republic of China

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