Identifying Interactions that Determine Fragment Binding at Protein Hotspots.

Area of Science:

• Medicinal Chemistry
• Structural Biology
• Computational Chemistry

Background:

• Identifying ligand-binding sites is crucial for drug discovery.
• Current methods lack guidance on critical binding interactions within pockets.

Purpose of the Study:

• To develop and validate a method for mapping atomic hotspots using molecular probes.
• To create fragment hotspot maps that visualize key binding interactions and pharmacophores.

Main Methods:

• Sampling atomic hotspots with small molecular probes.
• Generating fragment hotspot maps to identify binding sites and pharmacophores.
• Validating maps with experimental binding data of fragments and lead compounds.

Main Results:

• Fragment hotspot maps successfully highlight key fragment-binding sites and pharmacophores.
• Ligands were located in high-scoring regions of the maps, with a median rank of 97% for fragment atoms.
• Maps rationalized structure-activity relationship (SAR) data in fragment-based drug design projects.

Conclusions:

• Fragment hotspot maps offer an intuitive visual guide for structure-guided drug discovery.
• The method aids medicinal chemists in optimizing molecular growth and identifying suboptimal interactions.
• This approach enhances fragment-based drug design by providing detailed binding site insights.