BP-Dock: a flexible docking scheme for exploring protein-ligand interactions based on unbound structures.

Area of Science:

• Computational chemistry
• Structural biology
• Drug discovery

Background:

• Molecular docking is crucial for modeling protein-ligand interactions.
• Incorporating receptor flexibility, particularly backbone flexibility, remains a significant challenge in docking due to extensive conformational sampling requirements.

Purpose of the Study:

• To introduce BP-Dock (Backbone Perturbation-Dock), a novel flexible docking approach.
• To integrate backbone and side chain conformational changes induced by ligand binding using a multi-scale strategy.
• To enhance the accuracy of molecular docking, especially when using unbound receptor structures.

Main Methods:

• BP-Dock mimics binding-induced events by perturbing protein chain residues individually with Brownian kicks.
• Perturbation Response Scanning computes the chain's response fluctuation profile.
• Generated profiles create multiple binding-induced receptor conformations for ensemble docking.

Main Results:

• BP-Dock was evaluated on a diverse dataset using unbound receptor structures.
• Performance was compared against docking methods that do not account for overall receptor flexibility.
• Results underscore the importance of modeling backbone flexibility for accurate binding affinity prediction, particularly with unbound structures.

Conclusions:

• BP-Dock effectively generates diverse binding site conformations, improving unbound docking accuracy.
• The method aids in understanding protein-ligand interactions and facilitates virtual screening for drug design.
• BP-Dock offers a fast and efficient flexible docking solution.