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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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Bending elasticity of anti-parallel beta-sheets.

Seungho Choe1, Sean X Sun

  • 1Department of Mechanical Engineering, and Whitaker Institute of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland, USA.

Biophysical Journal
|November 23, 2006
PubMed
Summary

We used a coarse-grained elastic model to study beta-sheet bending properties. Explicit solvent lowers the bending constant, and an isotropic model accurately describes these protein dynamics.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Science

Background:

  • Beta-sheets are fundamental protein secondary structures.
  • Understanding their mechanical properties is crucial for protein folding and function.
  • Elastic models offer a computationally efficient way to study these properties.

Purpose of the Study:

  • To investigate the bending properties of anti-parallel beta-sheets using a coarse-grained elastic model.
  • To compute the elastic bending constant (kappa) and compare model predictions with molecular dynamics simulations.
  • To assess the influence of explicit solvent on beta-sheet bending rigidity.

Main Methods:

  • Development and application of a coarse-grained elastic model for beta-sheets.
  • Molecular dynamics simulations in vacuum and explicit solvent.
  • Comparison of conformational probabilities between simulations and the coarse-grained model to derive the bending constant.

Main Results:

  • The coarse-grained model, particularly with a uniform isotropic bending constant, accurately reproduces beta-sheet equilibrium fluctuations and response to external forces.
  • Explicit solvent significantly lowers the bending constant compared to vacuum conditions.
  • While an anisotropic bending model was explored, the computed anisotropy was weak, supporting the utility of the isotropic model.

Conclusions:

  • Coarse-grained elastic models are effective for studying beta-sheet mechanical properties.
  • Solvent effects play a significant role in reducing beta-sheet bending rigidity.
  • These findings have implications for understanding protein conformational dynamics and stability.