Frontal affinity chromatography: sugar-protein interactions.

Area of Science:

• Carbohydrate Chemistry
• Biophysical Chemistry
• Analytical Chemistry

Background:

• Glycan-binding proteins (lectins) play crucial roles in biological processes.
• Accurate quantification of lectin-glycan interactions is essential for understanding these roles.
• Existing methods for determining dissociation constants (Kd) can be time-consuming or require large sample amounts.

Purpose of the Study:

• To describe a standard protocol for frontal affinity chromatography using fluorescence detection (FAC-FD).
• To demonstrate the utility of FAC-FD for precise determination of dissociation constants (Kd) between lectins and fluorescent-labeled glycans.
• To highlight the efficiency and low sample requirements of the automated FAC system.

Main Methods:

• Utilized an automated frontal affinity chromatography system (FAC-1) with fluorescence detection.
• Employed lectin-immobilized columns and analyzed elution profiles of fluorescent-labeled glycans.
• Compared elution volumes (V) with controls (V0) to determine dissociation constants (Kd).

Main Results:

• Developed a standard protocol for FAC-FD analysis.
• Achieved precise determination of dissociation constants (Kd) for over 100 lectin-oligosaccharide interactions.
• Demonstrated high throughput with analysis of 100 interactions in approximately 10 hours.
• Required minimal sample amounts, as little as 2.5 pmol of pyridylaminated (PA) oligosaccharide per analysis.

Conclusions:

• FAC-FD is a versatile and precise technique for quantifying lectin-glycan interactions.
• The automated FAC system offers high throughput and low sample consumption.
• This method provides valuable quantitative data for over 100 lectin-oligosaccharide pairs, advancing glycomics research.