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Binding affinities for 2D protein dimerization benefit from enthalpic stabilization.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Dimerization is fundamental to macromolecular assembly in both solution (3D) and on membrane surfaces (2D).
  • Quantifying dimerization strength ( ) in 3D and 2D is crucial for understanding protein behavior, especially for proteins transitioning between these states.
  • Existing rigid-body models for may not fully capture the behavior of flexible proteins like BAR domains.

Purpose of the Study:

  • To investigate the impact of protein flexibility on BAR domain dimerization in 3D and 2D environments.
  • To determine if membrane association enhances dimer stability and selectivity compared to solution-based dimerization.
  • To develop metrics for assessing 2D affinities beyond rigid-body approximations.

Main Methods:

  • Molecular Dynamics (MD) simulations of BAR homodimerization in three environments: solution (3D), explicit lipid bilayer (2D), and pseudo-membrane (2D).
  • Analysis of free energy landscapes, backbone configurations, and dimer stability across different environments.
  • Calculation of dissociation constants () and relevant lengthscales to compare 3D and 2D dimerization.

Main Results:

  • Protein flexibility significantly alters the free energy landscape, favoring stable 2D dimerization over 3D.
  • Both explicit and pseudo-membrane environments induce configurations that enhance enthalpic favorability and stability of the BAR dimer.
  • The observed enhancement in 2D dimerization is dependent on interaction stability and not solely on rigid-body contributions.

Conclusions:

  • Conformational flexibility in BAR domains drives enhanced stability and selectivity for dimerization on membrane surfaces.
  • The study provides a framework to move beyond rigid-body estimates for 2D affinities, incorporating flexibility.
  • Enhanced membrane-associated assembly, indicated by calculated lengthscales, aligns with the role of BAR domains in membrane remodeling.