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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

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Published on: September 1, 2023

Stretched exponential dynamics in lipid bilayer simulations.

Erik G Brandt1, Olle Edholm

  • 1Theoretical Biological Physics, Department of Theoretical Physics, Royal Institute of Technology, AlbaNova University Center, SE-106 91 Stockholm, Sweden. erbr02@kth.se

The Journal of Chemical Physics
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Fluctuations in fluid biomembranes decay non-exponentially. Molecular dynamics simulations reveal stretched exponential decay, with dynamics governed by in-plane density fluctuations at short wavelengths.

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Area of Science:

  • Biophysics
  • Materials Science
  • Computational Chemistry

Background:

  • Fluid biomembranes exhibit complex dynamics.
  • Understanding membrane fluctuation decay is crucial for biological function.

Purpose of the Study:

  • To investigate the decay of fluctuations in lipid bilayer membranes.
  • To analyze structural correlation functions using molecular dynamics simulations.

Main Methods:

  • Atomistic and coarse-grained molecular dynamics simulations.
  • Calculation of structural correlation functions.
  • Analysis of dynamics across nanometer lengthscales and microsecond timescales.

Main Results:

  • Fluctuation decay is best described by stretched exponential functions.
  • Dynamics are similar for area density, thickness, and undulation fluctuations below 3 nm.
  • Out-of-plane height fluctuations appear at wavelengths above 6 nm.
  • Effective correlation times vary with wave vector, fitting inverse power-laws.

Conclusions:

  • Membrane fluctuation dynamics are complex and scale-dependent.
  • Simulations provide insights into biomembrane behavior, complementing experimental data.
  • Discrepancies with neutron spin-echo experiments in the hydrodynamic limit warrant further investigation.