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Hydrogen bonds do not drive polyalanine peptide fibrillization, despite playing a crucial role. Accurate molecular models are essential for understanding peptide aggregation and electrostatic interactions.

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Materials Science

Background:

  • Peptide fibrillization is a key process in several diseases.
  • Understanding the driving forces of fibrillization is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the contributions of mainchain and side chain atoms to polyalanine peptide fibrillization.
  • To elucidate the role of hydrogen bonds and electrostatic interactions in peptide aggregation.

Main Methods:

  • All-atom molecular dynamics simulations were employed.
  • Analysis focused on hydrogen bond formation and electrostatic energy contributions.

Main Results:

  • Total hydrogen bonds did not significantly change during aggregation due to a compensatory water-peptide-water bond mechanism.
  • Hydrogen bonds do not minimize electrostatic energy during fibril formation, suggesting they do not drive aggregation.
  • Aggregation without interpeptide hydrogen bonds incurs a significant electrostatic penalty (~9.4 kJ/mol).
  • Lennard-Jones and electrostatic contributions are orders of magnitude larger than the system's enthalpy, emphasizing the need for accurate models.

Conclusions:

  • Hydrogen bonds are important for stabilizing peptide fibrils but do not initiate the aggregation process.
  • Accurate modeling of atomic interactions is critical for reliable simulations of peptide fibrillization and enthalpy calculations.