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Related Experiment Videos

Secondary structure formation in N-substituted peptides

K Möhle1, H J Hofmann

  • 1Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Mineralogy, University of Leipzig, Germany.

The Journal of Peptide Research : Official Journal of the American Peptide Society
|March 12, 1998
PubMed
Summary

N-substitution in peptides restricts flexibility, hindering beta sheet formation. However, it promotes helical structures and specific beta turns, altering peptide conformation significantly.

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Biophysics

Background:

  • Understanding peptide secondary structure formation is crucial for protein folding and function.
  • N-substituted amino acids are incorporated into peptides to modify their properties.
  • The impact of N-substitution on peptide conformation and secondary structure elements requires detailed investigation.

Purpose of the Study:

  • To systematically analyze the conformational preferences of peptides containing N-substituted amino acids.
  • To investigate the influence of N-substitution on the formation of beta sheets, helices, and turns.
  • To compare the conformational landscape of N-substituted peptides with their unsubstituted counterparts.

Main Methods:

  • Ab initio molecular orbital (MO) theory calculations at HF/6-31G* and HF/3-21G levels.

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  • Inclusion of solvation effects to mimic physiological conditions.
  • Molecular dynamics simulations in both gas and solution phases.

    • Main Results:

    • N-substitution significantly restricts peptide chain flexibility.
    • Formation of beta sheets is disfavored by N-substitution.
    • Peptides with N-substituted amino acids exhibit a strong propensity for helical conformations (e.g., polyglycine II, alpha helix).
    • Specific beta turns (betaII, betaVIa) are favored, while betaI turns are destabilized.

    Conclusions:

    • N-substitution fundamentally alters peptide conformational landscapes.
    • The introduction of N-substituted amino acids can be a strategy to control peptide secondary structure.
    • Computational methods provide valuable insights into the effects of amino acid modifications on peptide behavior.