Nonfitting protein-ligand interaction scoring function based on first-principles theoretical chemistry methods:
Li Rao1, Igor Ying Zhang, Wenping Guo
1Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, China.
Journal of Computational Chemistry
|May 18, 2013
Summary
A new nonfitting scoring function accurately predicts protein-ligand interactions for targeted cancer therapy. This computational method improves drug design by enhancing the prediction of inhibitor efficacy for cancer research.
Area of Science:
- Computational chemistry
- Drug discovery
- Molecular modeling
Background:
- Targeted therapy requires potent and selective protein inhibitors.
- Current empirical scoring functions for inhibitor efficacy have low accuracy.
- Accurate prediction of protein-ligand interactions is crucial for drug design.
Purpose of the Study:
- To develop a novel, nonfitting scoring function for predicting protein-ligand binding affinity.
- To improve the accuracy of inhibitor efficacy estimation in drug design.
- To provide a reliable computational tool for screening potential drug candidates.
Main Methods:
- Developed a nonfitting scoring function integrating DFT (XYG3, ωB97X-D) and PM6 methods for binding enthalpy.
- Incorporated DFT-SMD solvation model for solvation free energy calculations.
- Estimated entropy effects using DFT frequency analysis.
Main Results:
- Tested the scoring function on cyclin-dependent kinase 2 (CDK2) and p21-activated kinase 1 (PAK1) inhibitor databases.
- Achieved good correlations (R(2) = 0.76-0.88) between calculated scores and experimental inhibitor efficacies.
- Demonstrated strong predictive power for inhibitor efficacy.
Conclusions:
- The developed high-level theory-based, nonfitting scoring function shows excellent performance.
- This scoring function offers a significant improvement over existing empirical methods.
- Recommended for use in the final screening stages of lead structure derivatives in drug discovery.
Related Concept Videos
02:40Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:40Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:04Protein-protein Interfaces
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
02:18The Equilibrium Binding Constant and Binding Strength
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
02:26Protein Networks
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
01:49Conserved Binding Sites
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...