GPCRana

GPCRana performs quantitative conformational analysis of class A G-protein-coupled receptor (GPCR) structures to identify residue-level activation pathways that link ligand-binding pockets to G-protein coupling regions.

Key Features:

• Quantitative Conformational Analysis: Quantifies conformational changes across GPCR structures, demonstrated on 234 structures from 45 class A GPCRs.
• Identification of Activation Pathway: Identifies a unified activation pathway comprising 34 residue pairs and 35 individual residues that integrates CWxP, DRY, Na+ pocket, NPxxY, and PIF motifs and links the ligand-binding pocket to the G-protein coupling region.
• Mechanistic Insights: Maps constitutively activating, inactivating, and disease-associated mutations onto the pathway to provide mechanistic interpretations of their effects.
• Site-Directed Mutagenesis Support: Findings are supported by site-directed mutagenesis experiments showing that targeted mutations along the pathway modulate receptor activity.
• Evolutionary Implications: Highlights how decoupling of ligand-binding and G-protein-binding regions via the pathway may have contributed to the evolutionary versatility of GPCR signal transduction.

Scientific Applications:

• Drug Discovery: Supports identification of novel therapeutic targets within the GPCR family by providing detailed activation-mechanism insights.
• Structural Biology: Enhances understanding of structural dynamics and conformational changes critical for receptor function.
• Mutagenesis Studies: Informs design and interpretation of site-directed mutagenesis experiments to assess functional consequences of specific mutations.

Methodology:

Analyzes 234 structures from 45 class A GPCRs to quantify conformational changes and identify a residue-level activation pathway composed of 34 residue pairs and 35 residues connecting CWxP, DRY, Na+ pocket, NPxxY, and PIF motifs.