Structural basis for pattern recognition by the receptor for advanced glycation end products (RAGE)

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Receptor for advanced glycated end products (RAGE) is a pattern recognition receptor involved in diseases like diabetes and neurodegeneration.
• The mechanism of how RAGE recognizes diverse advanced glycated end products (AGEs) has been unclear.

Purpose of the Study:

• To elucidate the structural mechanism of AGE recognition by RAGE.
• To investigate the oligomeric state and function of RAGE on the cell membrane.

Main Methods:

• NMR spectroscopy to determine the structure of the RAGE V-type domain and its interaction with AGEs.
• In-cell fluorescence resonance energy transfer (FRET) to study RAGE oligomerization.

Main Results:

• Identified three distinct positively charged surfaces on the RAGE V-type domain responsible for AGE recognition.
• Demonstrated significant flexibility in the secondary structure elements of these interaction surfaces.
• Showed that RAGE exists as a constitutive oligomer on the plasma membrane, with significantly higher binding affinity for AGEs compared to the isolated V domain.

Conclusions:

• The RAGE V-type domain mediates AGE recognition through specific surfaces with inherent flexibility.
• RAGE oligomerization is crucial for high-affinity recognition of AGE patterns, suggesting a role in disease pathogenesis.