Intra- and intermembrane pairwise molecular recognition between synthetic hydrogen-bonding phospholipids

Area of Science:

• Supramolecular Chemistry
• Interface Science
• Materials Science

Background:

• Molecular recognition at lipid membrane interfaces is crucial for biological and material applications.
• Hydrogen bonding in aqueous environments is challenging but vital for membrane function.
• Avidity and preorganization can enhance weak interactions at interfaces.

Purpose of the Study:

• To investigate if hydrogen bonding can drive selective molecular recognition at the lipid-water interface.
• To explore the potential of cyanuric acid and melamine for designing adhesive lipid interactions.
• To understand how designed headgroup interactions influence lipid assembly and membrane morphology.

Main Methods:

• Functionalization of phospholipids with cyanuric acid and melamine.
• Characterization of vesicle apposition, fusion, and adhesion in suspension and on solid supports.
• Structural, functional, and thermodynamic analysis of the designed lipid systems.

Main Results:

• Electrostatically identical membranes selectively adhered and fused, demonstrating effective hydrogen bonding at the interface.
• Designed lipid-lipid headgroup interactions significantly altered lipid phase morphology.
• The study provided extensive structural, functional, and thermodynamic data for aqueous hydrogen-bonding systems.

Conclusions:

• Hydrogen bonding interactions can be effectively translated to the lipid-water interface, overcoming solvent competition.
• Designed headgroup interactions offer a route to control membrane assembly and function.
• This work opens possibilities for creating selective adhesive interactions for materials and biotechnology.