Intermolecular Contact Potentials for Protein-Protein Interactions Extracted from Binding Free Energy Changes upon...

Area of Science:

• Structural biology
• Computational biophysics
• Protein biochemistry

Background:

• Predicting protein-protein interaction energetics is crucial for modeling protein complexes.
• Current methods often infer potentials from contact frequencies, involving approximations.
• Statistically inferred potentials may not fully capture physical chemistry.

Purpose of the Study:

• To derive atomic and residue contact potentials directly from experimental binding free energy changes.
• To investigate the physical chemistry congruence of these new potentials.
• To validate the derived potentials using protein-protein docking.

Main Methods:

• Utilized experimental binding free energy changes from mutations.
• Employed unweighted least-squares fitting and bootstrap aggregating.
• Developed a weighted scheme optimized against absolute binding affinity data.

Main Results:

• Generated novel sets of atomic and residue contact potentials.
• Investigated the physical chemistry basis of the derived potentials.
• Validated potentials through ranking and clustering of protein-protein docking poses.

Conclusions:

• Direct derivation from experimental data offers an alternative to statistical inference.
• The new potentials show congruence with physical chemistry principles.
• Validated potentials improve the accuracy of protein-protein docking and complex modeling.