Cellulases from Insects

  • Rainer Fischer
  • Raluca Ostafe
  • Richard M. Twyman
Chapter
Part of the Advances in Biochemical Engineering/Biotechnology book series (ABE, volume 136)

Abstract

Bioethanol is currently produced by the fermentation of sugary and starchy crops, but waste plant biomass is a more abundant source because sugars can be derived directly from cellulose. One of the limiting steps in the biomass-to-ethanol process is the degradation of cellulose to fermentable sugars (saccharification). This currently relies on the use of bacterial and/or fungal cellulases, which tend to have low activity under biorefinery conditions and are easily inhibited. Some insect species feed on plant biomass and can efficiently degrade cellulose to produce glucose as an energy source. Although insects were initially thought to require symbiotic relationships with bacteria and fungi to break down cellulose, several species in the orders Dictyoptera, Orthoptera, and Coleoptera have now been shown to produce their own cellulases in the midgut or salivary glands, and putative cellulase genes have been identified in other orders. Insect cellulases often work in concert with cellulases provided by symbiotic microbiota in the gut to achieve efficient cellulolysis. We discuss the current status of insect cellulases and potential strategies that could be used to find novel enzymes and improve their efficiency.

Graphical Abstract

Keywords

Biofuels Cellulase Cellulose Ethanol Insects Saccharification 

Abbreviations

CMC

carboxymethylcellulose

GH

glycoside hydrolase

Notes

Acknowledgments

This work was supported by the Hessian Ministry of Science and Art through funding for the collaborative research projects granted under the LOEWE program “Insect Biotechnology” and by the Excellence Cluster “Tailor-made Fuels from Biomass,” which is funded through the Excellence Initiative by the German federal and state governments to promote science and research at German universities.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Rainer Fischer
    • 1
  • Raluca Ostafe
    • 1
  • Richard M. Twyman
    • 2
  1. 1.Fraunhofer IMEAachenGermany
  2. 2.TRM LtdYorkUK

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