Applied Biochemistry and Biotechnology

, Volume 98, Issue 1–9, pp 273–287 | Cite as

Exploration of cellulose surface-binding properties of Acidothermus cellulolyticus Cel5A by site-specific mutagenesis

  • Suzanne L. McCarter
  • William S. Adney
  • Todd B. Vinzant
  • Edward Jennings
  • Fannie Posey Eddy
  • Stephen R. Decker
  • John O. Baker
  • Joshua Sakon
  • Michael E. Himmel


Understanding the interactions between cellulases and cellulosic substrates is critical to the development of an efficient artificial cellulase system for conversion of biomass to sugars. We directed specific mutations to the interactive surface of the Acidothermus cellulolyticus EI endoglucanase catalytic domain. The cellulose-binding domain is not translated in these mutants. Amino acid mutations were designed either to change the surface charge of the protein or to modify the potential for hydrogen bonding with cellulose. The relationship between cellulase-to-cellulose (Avicel PH101) binding and hydrolysis activity was determined for various groupings of mutations. While a significant increase in hydrolysis activity was not observed, certain clusters of residues did significantly alter substrate binding and some interesting correlations emerged. In the future, these observations may be used to aid the design of endoglucanases with improved performance on pretreated biomass.

Index Entries

Cellulase endoglucanase site-directed mutagenesis Acidothermus cellulolyticus Cel5A 


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Copyright information

© Humana Press Inc. 2002

Authors and Affiliations

  • Suzanne L. McCarter
    • 1
  • William S. Adney
    • 2
  • Todd B. Vinzant
    • 1
  • Edward Jennings
    • 1
  • Fannie Posey Eddy
    • 1
  • Stephen R. Decker
    • 1
  • John O. Baker
    • 1
  • Joshua Sakon
    • 1
  • Michael E. Himmel
    • 1
  1. 1.Biotechnology for Fuels and Chemicals DivisionNational Bioenergy Center, National Renewable Energy LaboratoryGolden
  2. 2.Department of Chemistry and BiochemistryUniversity of ArkansasFayetteville

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