Characterization of interaction between protein and carbohydrate using CZE

Area of Science:

• Analytical Chemistry
• Biochemistry
• Biophysics

Background:

• Proteins and amino acids interact with carbohydrates, influencing biological processes.
• Concanavalin A (Con A) is a lectin known for binding to specific carbohydrate structures.
• L-asparagine is an amino acid with potential carbohydrate-binding properties.

Purpose of the Study:

• To apply capillary zone electrophoresis (CZE) for investigating Con A and L-asparagine interactions with diverse carbohydrates.
• To quantitatively characterize these biomolecular interactions.
• To determine aggregation constants (K) using a mathematical model.

Main Methods:

• Capillary Zone Electrophoresis (CZE) was employed.
• Interactions were studied by adding various carbohydrates (D-glucose, D-fructose, D-mannose, D-galactose, maltose, lactose) to the electrolyte buffer.
• Changes in migration time and ionic mobility of Con A and L-asparagine were monitored.

Main Results:

• Distinct interaction patterns were observed between carbohydrates and Con A/L-asparagine.
• Carbohydrate addition and concentration variations altered migration times and ionic mobilities.
• A mathematical model successfully calculated aggregation constants (K).

Conclusions:

• CZE is a viable technique for quantitatively characterizing carbohydrate-protein and carbohydrate-amino acid interactions.
• The study provides a method for determining binding affinities.
• This approach offers insights into molecular recognition events.