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The Mouse Forced Swim Test
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Published on: January 29, 2012

Water under the BAR.

Edward Lyman1, Haosheng Cui, Gregory A Voth

  • 1Department of Chemistry, James Franck Institute, and Computation Institute, University of Chicago, Chicago, Illinois, USA.

Biophysical Journal
|September 23, 2010
PubMed
Summary
This summary is machine-generated.

Interfacial proteins generate membrane curvature, but the driving forces remain unclear. Simulations show water screening electrostatic interactions, suggesting they are not the primary mechanism for curvature sensing by amphiphysin N-BAR domains.

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Area of Science:

  • Cellular Biology
  • Biophysics
  • Structural Biology

Background:

  • Cellular processes rely on membrane curvature generated by interfacial proteins.
  • Several mechanisms for curvature generation exist, but their quantitative importance is not well understood.
  • The N-BAR domain of amphiphysin is a key protein involved in membrane bending.

Purpose of the Study:

  • To investigate the role of electrostatic attraction in the scaffold mechanism of membrane bending by amphiphysin N-BAR.
  • To quantitatively assess the contribution of electrostatic forces to protein-induced membrane curvature.
  • To understand the impact of water and dielectric screening on protein-membrane interactions.

Main Methods:

  • Atomistic molecular dynamics simulations of amphiphysin N-BAR domains bound to membranes.
  • Analysis of water and electrostatic interactions at the protein-membrane interface.
  • Coarse-grained simulations of oligomerized amphiphysin N-BARs to study induced curvature.

Main Results:

  • Significant water presence was observed between the membrane and the concave face of amphiphysin N-BAR, even on highly curved membranes.
  • This water layer causes substantial screening of electrostatic interactions.
  • Electrostatic attraction is unlikely to be the primary driver of curvature sensing, aligning with recent experimental findings.
  • Coarse-grained simulations revealed a strong dependence of induced curvature on dielectric screening.

Conclusions:

  • Electrostatic attraction is likely not the main driving force for membrane curvature sensing by amphiphysin N-BAR domains.
  • Water-mediated screening plays a crucial role in modulating protein-membrane interactions.
  • Care must be taken when developing coarse-grained models for protein-membrane interactions, considering dielectric screening effects.