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Related Experiment Videos

Electrical potentials in trypsin isozymes.

K Soman1, A S Yang, B Honig

  • 1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10027.

Biochemistry
|December 26, 1989
PubMed
Summary
This summary is machine-generated.

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Electrical potentials in trypsin active sites are similar despite charge differences, thanks to shielding. Asp-102 stabilizes the transition state, explaining enzyme activity variations.

Area of Science:

  • Biochemistry
  • Computational Biology
  • Enzymology

Background:

  • Cow and rat trypsin exhibit significant net charge differences (12.5 units) but share identical enzymatic mechanisms.
  • Understanding the role of electrical potentials in enzyme catalysis is crucial for explaining functional similarities despite structural variations.

Purpose of the Study:

  • To investigate the influence of electrical potentials on the catalytic mechanisms of cow and rat trypsin isozymes.
  • To determine how active site shielding affects catalytic potentials and to explain functional conservation.

Main Methods:

  • Utilized the finite difference Poisson-Boltzmann method for computational electrostatic modeling.
  • Analyzed local charge interactions and the contribution of specific amino acid residues (Asp-102, His-57, Ile-16) to enzyme potentials.

Related Experiment Videos

Main Results:

  • Active sites are shielded from surface charges, maintaining similar potentials in catalytically crucial regions for both trypsin types.
  • Asp-102's negative charge stabilizes the transition state by ~4 kcal/mol, consistent with reduced activity in Asp-102 variants.
  • Surface charges increase the pK of Ile-16 in rat trypsin by ~1.5 units, potentially explaining its high pH activity.

Conclusions:

  • Enzyme active site potentials are dominated by local interactions, not overall surface charge, enabling conserved catalytic mechanisms.
  • Asp-102 ionization and His-57 neutrality are predicted in the resting state.
  • Surface charge effects on Ile-16 pK offer a mechanistic explanation for rat trypsin's pH stability.