Measuring protein-protein and protein-nucleic Acid interactions by biolayer interferometry

Area of Science:

• Biochemistry
• Molecular Biology
• Analytical Chemistry

Background:

• Biolayer interferometry (BLI) is an optical sensing technique.
• It measures molecular interactions in real time.
• BLI utilizes a fiber-optic sensor with an immobilized biomolecular bait.

Purpose of the Study:

• To describe an efficient method for analyzing molecular interactions.
• To apply streptavidin-based BLI for studying DNA-protein and protein-protein interactions.
• To quantify binding affinities and kinetics.

Main Methods:

• Immobilization of a biomolecular bait on a sensor tip.
• Measurement of wavelength shifts caused by analyte binding.
• Real-time monitoring of binding events.
• Streptavidin-based BLI approach.

Main Results:

• Direct measurement of binding affinities (K(d)).
• Determination of association (k(a)) and dissociation (k(d)) rates.
• Quantitative analysis of DNA-protein and protein-protein interactions.
• Efficient analysis using nanomole quantities of sample in minutes.

Conclusions:

• BLI provides a rapid and efficient method for characterizing molecular interactions.
• Streptavidin-based BLI is effective for analyzing DNA-protein and protein-protein binding.
• The technique yields quantitative binding data in real time.