Applied Biochemistry and Biotechnology

, Volume 116, Issue 1–3, pp 1183–1191 | Cite as

Effects of ammonia fiber explosion treatment on activity of endoglucanase from Acidothermus cellulolyticus in transgenic plant

  • Farzaneh Teymouri
  • Hasan Alizadeh
  • Lizbeth Laureano-Pérez
  • Bruce DaleEmail author
  • Mariam Sticklen
Session 6B— Plant Biotechnology and Feedstock Genomics


A critical parameter affecting the economic feasibility of lignocellulosic bioconversion is the production of inexpensive and highly active cellulase enzymes in bulk quantity. A promising approach to reduce enzyme costs is to genetically transform plants with the genes of these enzymes, thereby producing the desired cellulases in the plants themselves. Extraction and recovery of active proteins or release of active cellulase from the plants during bioconversion could have a significant positive impact on overall lignocellulose conversion economics. The effects of ammonia fiber explosion (AFEX) pretreatment variables (treatment temperature, moisture content, and ammonia loading) on the activity of plant-produced heterologous cellulase enzyme were individually investigated via heat treatmett or ammonia treatment. Finally, we studied the effects of all these variables in concert through the AFEX process. The plant materials included transgenic tobacco plants expressing E1 (endoglucanase from Acidothermus cellulolyticus). The E1 activity was measured in untreated and AFEX-treated tobacco leaves to investigate the effects of the treatment on the activity of this enzyme. The maximum observed activity retention in AFEX-treated transgenic tobacco samples compared with untreated samples was approx 35% (at 60°C, 0.5∶1 ammonia loading, and 40% moisture). Based on these findings, it is our opinion that AFEX pretreatment is not a suitable option for releasing cellulase enzyme from transgenic plants.

Index Entries

Ammonia fiber explosion endoglucanase Acidothermus cellulolyticus transgenic tobacco E1cd 


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Copyright information

© Humana Press Inc. 2004

Authors and Affiliations

  • Farzaneh Teymouri
    • 1
  • Hasan Alizadeh
    • 1
  • Lizbeth Laureano-Pérez
    • 1
  • Bruce Dale
    • 1
    Email author
  • Mariam Sticklen
    • 2
  1. 1.Department of Chemical Engineering and Material ScienceMichigan State University
  2. 2.Crop and Soil Sciences DepartmentMichigan State University

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