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Charge-induced patchy attractions between proteins.

Weimin Li1, Björn A Persson, Maxim Morin

  • 1Division of Physical Chemistry and ‡Division of Theoretical Chemistry, Lund University , POB 124, 22100 Lund, Sweden.

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Summary
This summary is machine-generated.

Protein interactions are driven by electrostatic patches, leading to a salt-induced minimum in the second virial coefficient observed in static light scattering and simulations.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Science

Background:

  • Understanding protein-protein interactions is crucial for molecular biology.
  • Anisotropic interactions are key to protein self-assembly and function.
  • Electrostatic forces play a significant role in protein behavior.

Purpose of the Study:

  • To investigate the mechanisms of anisotropic, attractive protein interactions.
  • To elucidate the role of charged amino acids in protein interactions.
  • To explain the nonmonotonic behavior of the osmotic second virial coefficient.

Main Methods:

  • Utilizing static light scattering (SLS) for experimental analysis.
  • Employing structure-based Monte Carlo (MC) simulations for computational modeling.
  • Analyzing the osmotic second virial coefficient as a function of ionic strength.

Main Results:

  • Identified a highly directional, complementary electrostatic attractive patch formed by charged amino acids.
  • Demonstrated that this patch, along with Coulombic repulsion, causes counteracting electrostatic contributions to interaction free energy.
  • Observed a subtle, salt-induced minimum in the second virial coefficient, consistent between experiments and simulations.

Conclusions:

  • Anisotropic protein attraction arises from specific electrostatic patches on protein surfaces.
  • The interplay between attraction and repulsion at different length scales dictates protein interaction behavior.
  • The findings provide a mechanistic explanation for salt-dependent protein interactions.