IC50 Archive

  • Free energy perturbation theory for accurate IC50 calculations

    Free energy perturbation theory for accurate IC50 calculations

    Free Energy perturbation molecular dynamics demonstration. The calculation lets the molecule escape from the binding site and give the free energy difference, directly related to the binding affinity

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  • Solvation energy of a large atom cluster: continuous solvation energy test – II

    Solvation energy of a large atom cluster: continuous solvation energy test – II

    As it has been already stated here, binding energy calculation of a small molecule to a large protein poses a difficult problem: a method for molecular electrostatic energy calculation should work well both for the protein ligand complex, the protein and the ligand at infinite...

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  • Self-consistent solvation energy contribution calculation for protein-ligand complexes

    Self-consistent solvation energy contribution calculation for protein-ligand complexes

    Solvation energy is a major contribution to a ligand binding energy and is the interaction pretty much responsible for binding selectivity. Actual calculation of the solvation energy requires a method valid both for small molecule ligands and large proteins (and protein-ligand complexes). Calculation of the...

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  • Making a good water model: Molecules do conformationally change when cross from a gas to water solution

    Making a good water model: Molecules do conformationally change when cross from a gas to water solution

    Solvation energy calculation is absolutely crucial for a successful binding free energy (IC50) determination. Quantum Pharmaceuticals develops aqueous solvation models and tests them against available experimental data to validate the theoretical approaches. The graph on the left represents two types of solvation energy calculations compared...

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  • What’s an ultimate value of reversible drug binding constant?

    What’s an ultimate value of reversible drug binding constant?

    Traditional opinion is that a good drug must have a high value of the absolute meaning of the binding energy with target protein in order to prevent the thermal dissociation of the drug-protein complex. In this case an essential deformation of protein arises, which has...

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