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Related Experiment Videos

Effective fragment potentials and the enzyme active site.

S E Worthington1, M Krauss

  • 1Center for Advanced Research in Biotechnology, National Institute of Standards and Technology, Rockville, MD 20850, USA.

Computers & Chemistry
|May 18, 2000
PubMed
Summary

This study introduces an effective fragment potential (EFP) method to model enzyme active sites, enabling accurate substrate binding predictions. The approach successfully determined binding conformations for chorismate mutase and ribonuclease A.

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Area of Science:

  • Computational Chemistry
  • Biochemistry
  • Enzymology

Background:

  • Ab initio quantum chemistry is computationally expensive for large enzyme active sites.
  • Enzyme active sites contain hundreds of atoms, posing challenges for traditional quantum mechanical calculations.
  • Effective fragment potentials (EFPs) offer a solution by representing spectator residues with simplified potentials.

Purpose of the Study:

  • To develop and apply an EFP method for optimizing substrate binding conformations in enzyme active sites.
  • To reduce the computational cost of quantum chemistry calculations for enzyme-substrate interactions.
  • To investigate the binding mechanisms of transition state analogues and dianions in specific enzymes.

Main Methods:

  • Decomposition of enzyme active sites into active and spectator regions.

Related Experiment Videos

  • Implementation of EFP for electrostatics and polarization, with fitted repulsive and charge transfer potentials.
  • Application of the EFP method using the GAMESS software.
  • Optimization of binding conformations for transition state analogues and dianions.

    • Main Results:

    • Calculated binding conformation for chorismate mutase closely matched experimental X-ray structures.
    • Identified potential roles for Tyr108 and Arg63 in chorismate mutase binding, previously unnoted.
    • Revealed that Glu78 provides specific electronic activation augmenting electrostatic stabilization in chorismate mutase.
    • Observed proton movement in ribonuclease A to cluster charges for binding small dianions like phosphate and sulfate.

    Conclusions:

    • The EFP method is a viable approach for studying enzyme-substrate interactions and predicting binding conformations.
    • The study highlights specific amino acid residues and electronic interactions crucial for enzyme catalysis.
    • Computational modeling with EFPs can uncover novel insights into enzyme mechanisms and substrate binding.