Metadynamics Simulations Meet Ligand Design for the Reversible Inhibition of Human Peroxiredoxin 5

Area of Science:

• Biochemistry
• Computational Chemistry
• Drug Discovery

Background:

• Human peroxiredoxin 5 (Prx5) is a key enzyme involved in cellular redox homeostasis.
• Initial screening identified a low-affinity hit compound with selectivity for human Prx5.
• Understanding protein-ligand interactions is crucial for drug development.

Purpose of the Study:

• To investigate the impact of a single heavy-atom modification on the activity of a human Prx5 inhibitor.
• To explore the utility of funnel metadynamics simulations in rational drug design.
• To validate simulation-based predictions using experimental methods.

Main Methods:

• Funnel metadynamics, a molecular dynamics technique, was employed to model protein-ligand interactions.
• A single heavy-atom modification was introduced to the initial hit compound.
• NMR experiments and enzyme-inhibition assays were performed for validation.

Main Results:

• The heavy-atom modification led to a significant enhancement in inhibitory activity against human Prx5.
• Molecular dynamics simulations accurately predicted the binding interactions and activity enhancement.
• Experimental validation confirmed the simulation findings.

Conclusions:

• Minimal structural modifications, such as heavy-atom substitution, can substantially improve ligand efficacy.
• Funnel metadynamics is a powerful tool for rational drug design and lead optimization.
• This study provides a framework for developing improved ligands from initial selective hits.