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Updated: Jun 15, 2026

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

Published on: July 19, 2022

Macromolecular dynamics in crowded environments.

Carlos Echeverria¹, Raymond Kapral

¹Laboratorio de Física Aplicada y Computacional, Universidad Nacional Experimental del Táchira, San Cristóbal 5001, Venezuela. cecheve@unet.edu.ve

The Journal of Chemical Physics

|March 18, 2010

Summary

This summary is machine-generated.

Macromolecular dynamics change in crowded environments. Fixed obstacles significantly alter polymer collapse and diffusion, leading to subdiffusive motion and bloblike conformations in poor solvents.

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Area of Science:

Polymer Physics
Soft Matter Physics
Computational Biophysics

Background:

Macromolecular behavior diverges in confined or crowded systems compared to bulk solutions.
Understanding these differences is crucial for various biological and material science applications.

Purpose of the Study:

To investigate the conformational and diffusional dynamics of globular polymers in solutions with fixed spherical obstacles.
To analyze the influence of obstacle characteristics (volume fraction, size) and polymer length on these dynamics.

Main Methods:

A hybrid simulation scheme combining multiparticle collision dynamics (MPCD) for the solvent and molecular dynamics (MD) for the polymer.
Incorporation of monomer-monomer, polymer-obstacle, and polymer-solvent interactions, including hydrodynamic effects.

Main Results:

Obstacle arrays significantly impact polymer collapse, increasing the collapse timescale and showing nonmonotonic radius of gyration changes.
Hydrodynamic interactions are significant at low obstacle densities but screened at high densities.
Polymer diffusion exhibits subdiffusive behavior on intermediate timescales due to exploring the heterogeneous environment.
Large polymers in crowded conditions adopt bloblike structures due to trapping in interstitial voids.

Conclusions:

The presence of obstacles fundamentally alters polymer dynamics, deviating from behavior in simple solutions.
Obstacle-induced heterogeneity leads to complex diffusion patterns and conformational changes.
The study highlights the importance of environment structure on macromolecular behavior.