CP_dock: the complementarity plot for docking of proteins: implementing multi-dielectric continuum electrostatics.

Area of Science:

• Structural bioinformatics
• Computational biophysics
• Protein structure analysis

Background:

• The complementarity plot (CP) is a tool for validating protein structures, assessing both folding and binding.
• It analyzes shape and electrostatic complementarities of amino acid side-chains within protein interiors or interfaces.
• Current methods use single-dielectric models, potentially limiting physical realism.

Purpose of the Study:

• To introduce an upgraded complementarity plot (CP) with advanced multi-dielectric functionality for more realistic electrostatic complementarity calculations.
• To develop and validate a new variant plot, CPdock, specifically for protein-protein docking.
• To assess the efficacy of CPdock in discriminating between correct and incorrect protein-protein complex models.

Main Methods:

• Implemented multi-dielectric functionality in the electrostatic complementarity (Em) calculation, referencing Delphi version 6.2 or higher.
• Developed CPdock, a novel plot based on CP principles, tailored for protein docking applications.
• Tested CPdock's performance on a recent protein-protein docking benchmark dataset.

Main Results:

• The multi-dielectric approach provides more physico-chemically realistic electrostatic complementarity assessments compared to single-dielectric methods.
• Single- and multi-dielectric methods yield comparable Em values, indicating robustness.
• CPdock effectively discriminates between native and non-native protein-protein complexes in docking benchmarks.

Conclusions:

• The multi-dielectric version of the complementarity plot is recommended for enhanced reliability in protein structure validation.
• CPdock shows significant potential as an initial screening tool in protein-protein docking pipelines.
• CPdock offers a computationally efficient method for early-stage assessment of docking results.