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Related Experiment Videos

Dissecting substrate recognition by thrombin using the inactive mutant S195A.

Maxwell M Krem1, Enrico Di Cera

  • 1Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Box 8231, St. Louis, MO 63110, USA.

Biophysical Chemistry
|March 21, 2003
PubMed
Summary

Inactive thrombin mutants reveal equilibrium binding details. Studying substrate interactions with the S195A mutant provides thermodynamic insights complementing kinetic studies of wild-type thrombin.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Protein Science

Background:

  • Thrombin is a key enzyme in hemostasis.
  • Understanding thrombin-substrate interactions is crucial for drug development.
  • Catalytically inactive mutants offer a tool to study equilibrium binding.

Purpose of the Study:

  • To investigate thrombin-substrate interactions at equilibrium using a catalytically inactive mutant.
  • To determine thermodynamic parameters of substrate binding.
  • To compare binding energetics with known kinetic properties of wild-type thrombin.

Main Methods:

  • Utilized the catalytically inactive thrombin mutant S195A.
  • Employed intrinsic fluorescence spectroscopy to monitor substrate binding.
  • Performed equilibrium dissociation constant measurements and temperature dependence studies.

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Main Results:

  • The S195A mutant exhibited wild-type Na(+) binding properties, with enhanced substrate binding in the presence of Na(+).
  • Thermodynamic parameters for substrate binding were calculated, showing a negligible heat capacity change (deltaC(p)).
  • Binding energetics of synthetic substrates and PAR peptides were consistent with wild-type thrombin's specificity and steady-state behavior.

Conclusions:

  • Catalytically inactive enzyme mutants are valuable for dissecting equilibrium binding components.
  • These findings complement kinetic data obtained with wild-type enzymes.
  • The study provides a detailed thermodynamic characterization of thrombin's active site and exosite interactions.