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Nonequilibrium membrane fluctuations driven by active proteins.

Lawrence C-L Lin1, Nir Gov, Frank L H Brown

  • 1Department of Physics, University of California, Santa Barbara, 93106-9530, USA.

The Journal of Chemical Physics
|February 25, 2006
PubMed
Summary
This summary is machine-generated.

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This study models nonthermal membrane undulations caused by active membrane proteins, incorporating protein diffusion and directional forces. Fluctuation amplitudes now scale differently with system size, and distributions can be non-Gaussian.

Area of Science:

  • Biophysics
  • Soft Matter Physics
  • Membrane Biophysics

Background:

  • Active membrane proteins drive nonthermal undulations.
  • Previous models did not account for protein lateral diffusion or directional force exertion.
  • Understanding membrane dynamics is crucial for cellular processes.

Purpose of the Study:

  • To extend existing models of active membrane protein-driven undulations.
  • To incorporate lateral protein diffusion and anisotropic force exertion.
  • To investigate the impact on fluctuation amplitude scaling and probability distributions.

Main Methods:

  • Theoretical modeling of active membrane protein dynamics.
  • Incorporation of protein lateral mobility.
  • Analysis of anisotropic force exertion by oriented proteins.

Related Experiment Videos

  • Theoretical arguments and dynamic simulations.

    • Main Results:

    • Altered scaling of fluctuation amplitudes with system size.
    • Theoretical and simulation evidence for non-Gaussian fluctuation distributions in certain regimes.
    • Model accounts for protein diffusion and preferential force direction.

    Conclusions:

    • The extended model provides a more comprehensive description of active membrane undulations.
    • Protein diffusion and orientation significantly influence membrane fluctuation dynamics.
    • Non-Gaussian fluctuation distributions highlight deviations from thermal equilibrium behavior in active membranes.