Adhesion of nanoparticles to vesicles: a Brownian dynamics simulation

Area of Science:

• Biophysics
• Materials Science
• Computational Biology

Background:

• Bilayer vesicles are fundamental structures in biology and materials science.
• Understanding nanoparticle-vesicle interactions is crucial for drug delivery and nanotechnology.
• Previous studies have explored vesicle fusion and fission, but the role of adhesive nanoparticles is less understood.

Purpose of the Study:

• To investigate the morphological changes in bilayer vesicles induced by adhesive nanoparticles.
• To elucidate the mechanism by which nanoparticles promote vesicle fusion.
• To model the interaction using computational simulations.

Main Methods:

• Brownian dynamics simulations were employed to model the system.
• Adhesive nanoparticles were simulated as simple models of proteins or colloids.
• Vesicle morphology and fusion intermediates were analyzed computationally.

Main Results:

• Adhesive nanoparticles induced significant morphological changes, including budding and fission.
• Nanoparticles were shown to promote vesicle fusion by facilitating fusion-pore opening.
• The formation of a stalk intermediate, connecting outer monolayers, was observed during fusion, with nanoparticles bending this structure.

Conclusions:

• Adhesive nanoparticles play a critical role in modulating bilayer vesicle dynamics.
• Nanoparticle-induced bending of fusion stalks is a key mechanism for promoting fusion.
• These findings offer insights into nanoparticle-mediated membrane remodeling and fusion processes.