A virtual screening study of the acetylcholine binding protein using a relaxed-complex approach

Area of Science:

• Neuroscience
• Pharmacology
• Structural Biology

Background:

• Nicotinic acetylcholine receptors (nAChRs) are crucial ligand-gated ion channels involved in numerous neurological processes.
• High-resolution structures of nAChRs are challenging to obtain, hindering drug development.
• Acetylcholine binding protein (AChBP) structures provide a high-resolution surrogate for the extracellular domain of nAChRs.

Purpose of the Study:

• To virtually screen a diverse ligand library for potential binders of AChBP.
• To identify novel compounds that can modulate nAChR activity through AChBP interactions.
• To explore potential pharmaceutical applications for targeting nAChR-related neurological disorders.

Main Methods:

• Employed the relaxed-complex method, integrating molecular dynamics simulations and ligand docking.
• Utilized a virtual screening approach on the National Cancer Institute's ligand library.
• Assessed ligand binding affinity and specificity across various AChBP species and structures.

Main Results:

• Identified numerous ligands from the National Cancer Institute library with significant potential for binding AChBP.
• Observed that identified ligands mimic known AChBP binders and exhibit varied binding modes.
• A notable subset of ligands demonstrated effective docking against all tested AChBP species, with some showing selectivity.

Conclusions:

• The virtual screening successfully identified novel potential ligands for AChBP.
• These compounds represent promising candidates for pharmaceutical development targeting AChBP/nAChR systems.
• The findings offer new avenues for therapeutic strategies in neurological conditions associated with nAChRs.