Filling the Gaps in Antagonist CCR5 Binding, a Retrospective and Perspective Analysis

Area of Science:

• * Pharmacology
• * Molecular Biology
• * Medicinal Chemistry

Background:

• * Chemokine receptor 5 (CCR5) is implicated in numerous pathologies, driving research into receptor-ligand interactions and antagonist development.
• * CCR5 antagonism is a promising therapeutic strategy, with focus on understanding receptor active site occupancy by various antagonists.
• * CCL5, a natural CCR5 agonist, serves as a scaffold for developing CCR5 antagonists via N-terminus modifications.

Purpose of the Study:

• * To overview CCR5 active site occupancy by different antagonists.
• * To analyze CCL5 mutants and their impact on anti-HIV-1 activity.
• * To explore novel strategies for CCR5 blockade beyond N-terminus modifications.

Main Methods:

• * Retrospective 3D modeling analysis of CCL5 mutants.
• * Review of known CCR5 antagonists and their binding modes.
• * Exploration of allosteric antagonist development strategies.

Main Results:

• * Identified potential for novel amino acid substitutions outside the CCL5 N-terminus hotspot for CCR5 antagonist development.
• * Demonstrated that improved CCR5 interaction in distal regions and hydrophobic core stabilization enhance binding affinity and stability.
• * Highlighted allosteric antagonists as a novel direction for CCR5 blockade.

Conclusions:

• * Understanding CCR5-ligand interactions through 3D structural analysis is crucial for drug development.
• * Strategies beyond N-terminus modification and agonist/antagonist dualism are effective for CCR5 interaction modulation.
• * Allosteric antagonism represents a new frontier in GPCR druggability and CCR5 blockade.