Generalization of a targeted library design protocol: application to 5-HT7 receptor ligands

Area of Science:

• Medicinal Chemistry
• Computational Chemistry
• Pharmacology

Background:

• Designing targeted molecular libraries is crucial for drug discovery, especially for proteins with multi-subsite binding pockets.
• G-Protein Coupled Receptors (GPCRs), such as the serotonin type 7 (5-HT7) receptor, are important drug targets.

Purpose of the Study:

• To present a general strategy for designing targeted libraries for proteins with divisible binding sites.
• To apply this strategy to create a focused library for the 5-HT7 receptor and evaluate its enrichment of potential ligands.

Main Methods:

• Chemogenomic classification of protein subsites.
• Collection of bioactive molecular fragments and virtual library generation.
• Principal Component Analysis (PCA) of molecular descriptors, 3D pharmacophore modeling, and docking calculations.

Main Results:

• A targeted library of 500 molecules for the 5-HT7 receptor was assembled using commercially available building blocks.
• PCA demonstrated that the targeted library occupied a denser region of chemical space compared to a diverse reference library.
• Computational validations indicated an enrichment factor of 2-4 for 5-HT7 receptor ligand-like molecules in the targeted library.

Conclusions:

• The proposed design strategy effectively generates focused libraries with enriched potential drug candidates.
• This method offers a practical solution for designing targeted libraries for proteins with complex binding sites, exemplified by the 5-HT7 receptor.