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Related Experiment Videos

Binding free energy calculations for P450cam-substrate complexes

M D Paulsen1, R L Ornstein

  • 1Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA.

Protein Engineering
|July 1, 1996
PubMed
Summary

A new semi-empirical method accurately predicts binding free energies for cytochrome P450cam substrates. This computational approach shows promise for understanding enzyme-substrate interactions and predicting mutation effects.

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Area of Science:

  • Computational chemistry
  • Biochemistry
  • Enzyme kinetics

Background:

  • Cytochrome P450 enzymes are crucial in drug metabolism.
  • Accurate prediction of substrate binding is essential for drug design.
  • Semi-empirical methods offer a balance between accuracy and computational cost.

Purpose of the Study:

  • To evaluate a novel semi-empirical method for calculating binding free energies.
  • To assess the method's accuracy for various cytochrome P450cam substrates.
  • To explore the method's capability in predicting orientation and mutation effects.

Main Methods:

  • Application of a recently proposed semi-empirical method.
  • Calculation of absolute and relative binding free energies for 11 substrates.

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  • Analysis of substrate orientation and active site mutation impacts.

    • Main Results:

    • Good reproduction of absolute and relative binding free energies for 11 substrates.
    • Mean error of 0.55 kcal/mol for absolute binding free energies.
    • Correct sign prediction for 48 out of 55 relative binding free energies, with a mean unsigned error of 0.77 kcal/mol.

    Conclusions:

    • The semi-empirical method shows high accuracy in predicting binding free energies for cytochrome P450cam.
    • The method is capable of assessing substrate orientation and active site mutation effects.
    • This approach holds potential for advancing drug discovery and enzyme mechanism studies.