Membrane-Mediated Interactions Between Nonspherical Elastic Particles

Area of Science:

• Biophysics
• Materials Science
• Cell Biology

Background:

• Particle transport across lipid membranes is crucial for cellular function.
• While hard particle wrapping is studied, deformable particle interactions are less understood.
• Deformable particles include vesicles, viruses, and nanoparticles, relevant in biological and medical contexts.

Purpose of the Study:

• To investigate the wrapping of nonspherical, deformable vesicles by lipid-bilayer membranes.
• To predict how vesicle properties (size, shape, elasticity) influence wrapping states.
• To analyze the interactions between partially wrapped vesicles.

Main Methods:

• Utilized the Helfrich Hamiltonian for membrane energetics.
• Employed triangulated membranes for computational modeling.
• Performed energy minimization to predict vesicle-membrane configurations.

Main Results:

• Increased vesicle softness stabilizes shallow- and deep-wrapped states over nonwrapped or fully wrapped states.
• The lipid membrane mediates interactions between partially wrapped vesicles.
• Deep-wrapped vesicles exhibit repulsion, while shallow-wrapped vesicles show attraction (tip-to-tip) or repulsion (side-by-side).

Conclusions:

• Vesicle deformability significantly alters wrapping dynamics and inter-vesicle interactions.
• Understanding these interactions is key for controlling particle assembly at membranes.
• Findings can inform the design of deformable particles for targeted drug delivery and other medical applications.