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Peptoid polymers fold into specific structures, mimicking protein hairpins. Molecular dynamics simulations reveal how sequence and solvent impact folding, stability, and helical handedness.

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Area of Science:

  • Biomimetic polymers
  • Polymer chemistry
  • Computational chemistry

Background:

  • Peptoids are sequence-defined polymers with peptide-like backbones.
  • They offer precise control over structure and self-assembly.
  • Understanding folding drivers and sequence-structure relationships is crucial.

Purpose of the Study:

  • Investigate peptoid folding into helical hairpin structures.
  • Analyze the influence of sequence characteristics on folding behavior.
  • Compare structural differences and solvent effects in water and acetonitrile.

Main Methods:

  • Molecular dynamics (MD) simulations were employed.
  • Simulations focused on linked 15mer peptoid sequences.
  • Structural analysis in different solvent environments (water, acetonitrile).

Main Results:

  • Identified sequence-dependent folding into hairpin structures.
  • Observed distinct structural outcomes based on sequence variations.
  • Characterized differences in helical motif handedness between solvents.

Conclusions:

  • Sequence and solvent significantly influence peptoid folding and stability.
  • MD simulations provide insights into peptoid secondary and tertiary structure formation.
  • Chirality and hydrophobicity play key roles in peptoid hairpin mimicry.