Advances in enzyme substrate analysis with capillary electrophoresis

Area of Science:

• Biochemistry and Analytical Chemistry

Background:

• Enzyme and substrate characterization is crucial for understanding biological processes.
• Traditional methods often lack the resolution or sensitivity for complex analyses.
• Capillary electrophoresis (CE) presents a high-resolution, low-volume alternative.

Purpose of the Study:

• To review the fundamentals of capillary electrophoresis for enzyme and substrate analysis.
• To outline the application of CE for determining enzyme kinetics and inhibition.
• To highlight emerging CE techniques for structural and sequence information.

Main Methods:

• Discussion of CE separation mechanisms for charged, neutral, and chiral molecules.
• Review of Michaelis-Menten kinetics and translation of electropherograms to curves.
• Examination of optimized conditions for coupling enzyme reactions with CE.

Main Results:

• CE enables K_M determinations across nanomolar to millimolar concentrations.
• CE is effective for quantifying enzyme inhibition (K_I, IC₅₀).
• Immobilized enzyme reactors enhance enzyme stability and screening capabilities.

Conclusions:

• Capillary electrophoresis is a versatile, cost-effective tool for enzyme characterization.
• CE facilitates detailed kinetic and inhibition studies, even with limited sample.
• Advanced CE applications include structural identification and peptide/protein analysis.