Lipid/polydiacetylene films for colorimetric protein surface-charge analysis

Area of Science:

• Biochemistry
• Materials Science
• Analytical Chemistry

Background:

• Protein surface charge distribution is crucial for biological functions and interactions.
• Existing methods for protein surface charge analysis can be limited.
• Developing new, sensitive techniques for charge characterization is essential.

Purpose of the Study:

• To present a novel approach for protein surface-charge analysis.
• To utilize chromatic lipid/polydiacetylene (PDA) films for visualizing electrostatic interactions.
• To enable protein discrimination based on surface charge abundance and organization.

Main Methods:

• Employing chromatic lipid/polydiacetylene (PDA) films that exhibit blue-red transitions.
• Modulating protein interactions with the PDA films via electrostatic forces.
• Utilizing lipid-embedded multivalent calixarene ligands with charged residues for enhanced interaction modulation.

Main Results:

• Demonstrated that blue-red transitions on PDA films effectively characterize protein surface charge.
• Showcased significant modulation of protein-film interactions through calixarene-protein complexation.
• Achieved protein discrimination based on quantifiable changes in surface charge properties.

Conclusions:

• The lipid/PDA film system offers a sensitive and quantifiable method for protein surface-charge characterization.
• This approach facilitates the identification of anomalous electrostatic properties in proteins.
• The developed system holds potential for advancing protein interaction studies and diagnostics.