Efficient Refinement of Complex Structures of Flexible Histone Peptides Using Post-Docking Molecular Dynamics...

Area of Science:

• Structural Biology
• Computational Chemistry
• Drug Discovery

Background:

• Histone complexes are crucial in epigenetics, with therapeutic and diagnostic potential.
• Accurate structural determination of histone complexes is vital for drug design.
• Computational molecular docking is a key tool, but faces challenges with flexible peptide ligands like histone tails.

Purpose of the Study:

• To systematically explore and compare different molecular dynamics (MD) refinement strategies for improving docked histone peptide-ligand complex structures.
• To identify the optimal MD refinement protocol for enhancing structural accuracy in drug design applications.

Main Methods:

• Six distinct molecular dynamics (MD) refinement protocols were evaluated.
• Pre-MD hydration was applied to complex interface regions across all protocols.
• Systematic comparison of protocols using complexes with known inaccuracies in docked geometries.

Main Results:

• The best-performing MD refinement protocol demonstrated a median improvement of 32% in structural accuracy compared to initial docked structures.
• This improvement was measured by the change in root mean squared deviations from experimental references.
• The study analyzed the impact of structural factors and explicit hydration on refinement efficacy.

Conclusions:

• Optimized molecular dynamics (MD) refinement significantly enhances the structural quality of computationally docked histone peptide complexes.
• The findings provide guidance for selecting effective MD refinement protocols in drug discovery.
• Understanding the role of hydration is key for future improvements in docking and refinement methods.