PDA-PreD

PDA-PreD predicts binding affinities of protein-DNA complexes from structural features to quantify determinants of binding free energy (ΔG).

Key Features:

• Data Collection: Uses a dataset of experimental binding free energy (ΔG) values for 391 protein-DNA complexes.
• Structural Feature Analysis: Derives structure-based features including interaction energy, contact potentials, volume and surface area of binding site residues, DNA base-step parameters, and atom-type contacts between proteins and DNA.
• Correlation with Binding Affinity: Identifies factors influencing binding affinity such as number of DNA strands, functional and structural classes of proteins, and binding-site properties (atom contacts, binding site volume, interaction energies, contact potentials).
• Predictive Modeling: Employs multiple regression equations tailored to different structural and functional classes of protein-DNA complexes.
• Performance Metrics: Reports an average correlation coefficient of 0.78 and a mean absolute error of 0.98 kcal/mol between experimental and predicted affinities as validated by jack-knife testing.

Scientific Applications:

• Recognition Mechanism Analysis: Elucidates structural determinants of protein-DNA recognition by relating structural features to binding free energy.
• Experimental Design and Intervention: Informs experimental design and interventions targeting gene regulation by predicting effects on binding affinity.
• Drug Discovery: Supports drug discovery efforts aimed at modulating protein-DNA interactions by providing affinity predictions for complexes of interest.

Methodology:

Collects experimental binding free energies (ΔG) for 391 protein-DNA complexes, extracts structure-based features (interaction energy, contact potentials, binding-site volume and surface area, DNA base-step parameters, atom-type contacts), analyzes feature–affinity relationships, trains regression models using machine learning techniques with multiple regression equations, and validates performance via jack-knife testing.