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Structure-function relationships in immobilized chymotrypsin catalysis.

Douglas S Clark1, James E Bailey

  • 1Department of Chemical Engineering, California Institute of Technology, Pasadena 91125, USA.

Biotechnology and Bioengineering
|September 5, 2002
PubMed
Summary
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Immobilizing alpha-chymotrypsin affects its active site. Using a spacer arm improves enzyme activity and flexibility compared to direct coupling, as shown by electron paramagnetic resonance (EPR) spectroscopy.

Area of Science:

  • Biochemistry
  • Enzyme immobilization
  • Biophysical chemistry

Background:

  • Enzyme immobilization is crucial for industrial applications, but can alter enzyme structure and activity.
  • Alpha-chymotrypsin is a widely studied serine protease.

Purpose of the Study:

  • To investigate the impact of immobilization conditions on alpha-chymotrypsin's active site configuration and specific activity.
  • To correlate structural changes with functional activity using EPR spectroscopy.

Main Methods:

  • Immobilization of alpha-chymotrypsin on CNBr-activated Sepharose 4B with varying enzyme loadings and a six-carbon spacer arm.
  • Electron paramagnetic resonance (EPR) spectroscopy using a spin label attached to the enzyme's active site.

Main Results:

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  • Specific activity decreased with increased enzyme loading.
  • Increased rotational correlation time of the spin label indicated reduced active site mobility at higher loadings.
  • Enzyme immobilized with a spacer arm showed higher specific activity and spin label mobility than directly coupled enzyme.

Conclusions:

  • Immobilization conditions significantly affect alpha-chymotrypsin's active site structure and function.
  • Spacer arms can mitigate negative effects of immobilization, preserving enzyme activity.
  • EPR spectroscopy is a valuable tool for understanding structure-activity relationships in immobilized enzymes.