Structural basis for ligand recognition and activation of RAGE

Area of Science:

• Biochemistry
• Structural Biology
• Molecular Immunology

Background:

• The Receptor for Advanced Glycation End Products (RAGE) is a key pattern recognition receptor implicated in inflammatory responses.
• RAGE is associated with various pathologies, including diabetic complications, tumor progression, and neurodegenerative diseases.
• Ligand binding to RAGE triggers cellular signaling cascades.

Purpose of the Study:

• To determine the X-ray crystal structure of the VC1 ligand-binding region of human RAGE.
• To map the S100B binding surface on the RAGE VC1 domain.
• To generate a structural model of the RAGE VC1-S100B complex and understand RAGE activation mechanisms.

Main Methods:

• X-ray crystallography was used to determine the RAGE VC1 domain structure at 1.85 Å resolution.
• Heteronuclear NMR spectroscopy monitored S100B titrations to map the ligand-binding surface.
• Restrained docking calculations utilized NMR chemical shift perturbations to model the VC1-S100B complex.

Main Results:

• The crystal structure of the RAGE VC1 domain was successfully resolved.
• NMR data identified the S100B binding interface on the RAGE VC1 domain.
• A structural model of the VC1-S100B complex was generated, suggesting a role for RAGE self-association in its function.

Conclusions:

• The study provides a high-resolution structure of the RAGE VC1 domain.
• Structural and biochemical data elucidate the interaction between RAGE and S100B.
• Findings offer mechanistic insights into RAGE activation and its implications in disease.