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Determination of Glucan Chain Length Distribution of Glycogen Using the Fluorophore-Assisted Carbohydrate Electrophoresis (FACE) Method
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The evolution of cyclodextrin glucanotransferase product specificity.

Ronan M Kelly1, Lubbert Dijkhuizen, Hans Leemhuis

  • 1Microbial Physiology, Groningen Biomolecular Sciences and Biotechnology Institute, Centre for Carbohydrate Bioprocessing, University of Groningen, Kerklaan 30, 9751 NN Haren, the Netherlands.

Applied Microbiology and Biotechnology
|April 16, 2009
PubMed
Summary

Cyclodextrin glucanotransferases (CGTases) create cyclodextrins from starch. Evolutionary changes in amino acids at enzyme binding sites diversified CGTase product specificity, affecting cyclodextrin ratios.

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Area of Science:

  • Enzymology
  • Biochemistry
  • Molecular Evolution

Background:

  • Cyclodextrin glucanotransferases (CGTases) are industrially significant enzymes that synthesize cyclodextrins (cyclic oligosaccharides) from starch.
  • CGTases produce alpha, beta, and gamma cyclodextrins, differing in glucose units (6, 7, or 8, respectively).

Purpose of the Study:

  • To investigate the structural factors driving the evolutionary diversification of product specificity in CGTases.
  • To analyze the product profiles of nine CGTases from organisms with varying thermal optima (mesophilic, thermophilic, hyperthermophilic).

Main Methods:

  • Comparative analysis of cyclodextrin product mixtures formed by nine selected CGTases.
  • Sequence comparison of the selected CGTases to identify structural variations.

Main Results:

  • Significant variations were observed in CGTase thermostability, reaction rates, substrate conversion efficiency, and the ratios of alpha-, beta-, and gamma-cyclodextrins produced.
  • Sequence analysis indicated that specific amino acid changes within the substrate binding sites correlate with altered cyclodextrin product specificity.

Conclusions:

  • Evolutionary amino acid substitutions at the substrate binding sites are key determinants of CGTase product specificity.
  • Understanding these structural-functional relationships can guide enzyme engineering for targeted cyclodextrin production.