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Area of Science:

  • Biochemistry
  • Computational Biology
  • Chemical Physics

Background:

  • Buffers are crucial for stabilizing protein solutions.
  • Buffer interactions with proteins are often overlooked.
  • Imidazolium buffers may influence protein stability.

Purpose of the Study:

  • Investigate interactions between imidazolium buffer and elastin-like polypeptides.
  • Understand the impact of pH on these buffer-protein interactions.
  • Quantify the effect of imidazolium on peptide solvation and stability.

Main Methods:

  • Constant pH molecular dynamics simulations.
  • Analysis of buffer aggregation and hydrogen bonding.
  • Calculation of transfer free energies.

Main Results:

  • Neutral imidazolium (IMI°) aggregates in peptide solvation shells and forms hydrogen bonds.
  • Charged imidazolium (IMI+) accumulates around oppositely charged peptides due to electrostatics.
  • Imidazolium enhances peptide solvation, with effects comparable to urea.

Conclusions:

  • Imidazolium-peptide interactions are pH-dependent and dominated by electrostatics.
  • Imidazolium can favorably solvate peptides, potentially impacting protein stability.
  • These findings highlight the importance of considering buffer-specific effects in protein studies.