A Structural Framework for GPCR Chemogenomics: What's In a Residue Number?

Area of Science:

• Biochemistry and Structural Biology
• Pharmacology and Cheminformatics

Background:

• G protein-coupled receptors (GPCRs) are a major drug target family, with recent advances in structural biology providing a wealth of data.
• Existing data on GPCR sequences, structures, ligand bioactivity, and mutations enable integrated chemogenomics workflows.
• Cross-family and cross-class studies highlight the need for a standardized nomenclature for GPCR structural elements.

Purpose of the Study:

• To introduce and discuss sequence- and structure-based generic numbering schemes for GPCRs.
• To demonstrate how these numbering schemes facilitate various chemogenomics studies.
• To address the remaining challenges and caveats associated with these numbering systems.

Main Methods:

• Development and application of sequence- and structure-based numbering schemes for different GPCR classes.
• Utilizing these schemes in integrated chemogenomics workflows.
• Analysis of cross-family and cross-class GPCR data.

Main Results:

• Implementation of a generic numbering scheme for GPCR structural elements.
• Facilitation of key chemogenomics applications, including consensus binding site definition and comparison.
• Enabling ligand repurposing for orphan receptors and class-wide chemogenomics studies.

Conclusions:

• A standardized numbering scheme is crucial for advancing GPCR chemogenomics.
• These schemes enhance comparative analyses, drug repurposing, and predictive modeling.
• Further refinement and adoption of these schemes will accelerate GPCR-targeted drug discovery.