Kinetics of Nanoparticle-Membrane Adhesion Mediated by Multivalent Interactions.

Area of Science:

• Biophysics
• Materials Science
• Nanotechnology

Background:

• Multivalent adhesive interactions are fundamental to biological processes like cell adhesion and particle uptake.
• These interactions also control self-assembly in materials science, with equilibrium states linked to binding strength and density.
• Strong interactions can lead to kinetic factors slowing equilibration, forming long-lived out-of-equilibrium states.

Purpose of the Study:

• To experimentally investigate the kinetics of nanoparticle adhesion to biomimetic lipid membranes.
• To understand how multivalent interactions, using DNA constructs as ligands and receptors, influence adhesion rates.
• To explore the impact of receptor density and nanoparticle concentration on adhesion kinetics.

Main Methods:

• Experimental investigation of nanoparticle adhesion kinetics to biomimetic lipid membranes.
• Utilizing DNA constructs to mimic multivalent ligand-receptor interactions.
• Varying surface density of membrane-anchored receptors and bulk nanoparticle concentration.
• Employing numerical simulations to support experimental findings.

Main Results:

• Observed a substantial decrease in nanoparticle adhesion rate when available receptors were limited relative to ligands.
• Attributed this behavior to the rapid sequestration of available receptors following initial nanoparticle adsorption.
• Experimental trends were consistent with numerical simulations.

Conclusions:

• The kinetics of nanoparticle adhesion are significantly influenced by receptor availability and sequestration dynamics.
• Out-of-equilibrium states in multivalent interactions can arise from rapid receptor binding.
• Findings provide insights into particle adhesion to biological membranes and self-assembly processes.