Haptic-Assisted Interactive Molecular Docking Incorporating Receptor Flexibility.

Area of Science:

• Computational chemistry
• Biophysics
• Molecular modeling

Background:

• Haptic-assisted docking tools enhance user intuition in molecular binding simulations.
• Existing tools often omit receptor flexibility due to haptic refresh rate constraints (>500 Hz).

Purpose of the Study:

• To develop a haptic-assisted docking tool, Haptimol FlexiDock, that models receptor conformational changes during ligand binding.
• To maintain a high haptic refresh rate while incorporating receptor flexibility.

Main Methods:

• Utilized the linear response method to model receptor flexibility.
• Determined the variance-covariance matrix from molecular dynamics simulations of ligand-free receptors.
• Employed eigenvector decomposition for rapid approximation of conformational response.

Main Results:

• Haptimol FlexiDock successfully models receptor conformational response to ligand interaction forces.
• The method maintains the required haptic refresh rate for smooth, stable force feedback.
• Simulations on glutamine and maltose binding proteins showed good agreement with experimental movements.

Conclusions:

• Haptimol FlexiDock accurately simulates ligand-induced receptor conformational changes.
• The tool is particularly promising for advancing structure-based drug design.
• This approach integrates molecular dynamics insights into interactive docking simulations.