A simple approach to well-defined sugar-coated surfaces for interaction studies

Area of Science:

• Biochemistry
• Carbohydrate Chemistry
• Biophysical Chemistry

Background:

• Protein-carbohydrate interactions are vital in biological processes.
• Studying these interactions requires simple, reliable tools.
• Surface-based methods offer advantages like mimicking cell-surface recognition and high-throughput screening.

Purpose of the Study:

• To design and synthesize a peptide module for efficient glycan capture.
• To create chemically defined glycan surfaces for biophysical studies.
• To demonstrate the utility of the method for analyzing a wide range of binding affinities.

Main Methods:

• Peptide module design and synthesis.
• Oxime ligation for glycan capture at the reducing end.
• Immobilization onto carboxyl-functionalized supports.
• Generation of well-defined glycan surfaces.
• Surface Plasmon Resonance (SPR) analysis.

Main Results:

• A peptide module was successfully synthesized for efficient glycan capture.
• Chemically defined glycan surfaces were generated.
• The method enabled SPR studies of interactions across five orders of magnitude in affinity.
• Analysis included strong binding of wheat germ agglutinin to chitopentose and weak binding to HEV32.

Conclusions:

• The developed peptide module provides a versatile tool for creating glycan surfaces.
• This approach is effective for studying protein-glycan interactions using SPR.
• The method is suitable for analyzing a broad spectrum of binding affinities, from strong to weak.