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Leu600 mutations decrease product inhibition of the β-cyclodextrin glycosyltransferase from Bacillus circulans STB01.

Shuangdi Chen1, Zhaofeng Li2, Zhengbiao Gu2

  • 1School of Food Science and Technology, Jiangnan University, Wuxi, China.

International Journal of Biological Macromolecules
|May 8, 2018
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Researchers engineered cyclodextrin glycosyltransferases (CGTases) to reduce product inhibition, a key industrial production challenge. Mutating specific residues weakened enzyme-product binding, improving cyclodextrin production efficiency.

Keywords:
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Area of Science:

  • Biochemistry
  • Enzyme Engineering
  • Industrial Biotechnology

Background:

  • Cyclodextrin glycosyltransferases (CGTases) are crucial enzymes for producing cyclodextrins from starch.
  • Product inhibition by cyclodextrins limits the industrial efficiency of CGTase-catalyzed reactions.
  • Overcoming product inhibition is essential for optimizing large-scale cyclodextrin manufacturing.

Purpose of the Study:

  • To engineer Bacillus circulans β-CGTase mutants to reduce product inhibition by β-cyclodextrin.
  • To investigate the kinetic and structural basis for decreased product inhibition in engineered CGTases.

Main Methods:

  • Site-directed mutagenesis was used to create mutants at residue Leu600 of β-CGTase.
  • Kinetic analyses were performed to determine inhibition constants (Ki, Ki') and Km' values.
  • 3D structural modeling was employed to analyze enzyme-product interactions.

Main Results:

  • Mutations at Leu600 (L600I, L600E, L600R) resulted in higher inhibition constants, indicating weakened product inhibition.
  • The L600Y mutant showed a 40% increase in Ki', signifying reduced noncompetitive inhibition.
  • Kinetic and structural data suggest reduced binding affinity between cyclodextrin and mutant CGTases.

Conclusions:

  • Mutations at Leu600 effectively decrease product inhibition in β-CGTase by reducing the enzyme's affinity for cyclodextrin.
  • These engineered CGTases hold potential for enhancing the industrial production of cyclodextrins.
  • Understanding enzyme-product interactions is key to designing more efficient industrial enzymes.