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Energy minimization studies on alpha-turns

C Ramakrishnan1, D V Nataraj

  • 1Molecular Biophysics Unit, Indian Institute of Science, Bangalore.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|July 29, 1998
PubMed
Summary

Researchers explored tetrapeptide conformations, identifying 23 minimum energy conformations (MECs) with 5-->1 hydrogen bonds, termed alpha-turns. Bifurcated hydrogen bonding and non-glycyl residues like alanine and proline were common features in these stable peptide structures.

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Biophysics

Background:

  • Understanding peptide conformation is crucial for protein folding and function.
  • Alpha-turns, a specific type of secondary structure stabilized by hydrogen bonds, are important in protein architecture.

Purpose of the Study:

  • To systematically explore the conformational space of tetrapeptides.
  • To identify and characterize geometrically possible alpha-turns (5-->1 hydrogen-bonded conformations).
  • To analyze the structural features and variability of minimum energy conformations (MECs).

Main Methods:

  • Grid search technique to scan the entire conformational space of tetrapeptides.
  • Energy minimization to determine stable conformations.
  • Classification of minimum energy conformations into distinct classes.

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Main Results:

  • Identified 23 distinct minimum energy conformations (MECs) for tetrapeptides, classified into 13 different groups.
  • Observed conformational variability within classes due to the presence of beta and gamma turns alongside the primary 5-->1 hydrogen bond.
  • Found bifurcated hydrogen bonding networks to be a characteristic feature in most MECs.
  • Demonstrated the accommodation of non-glycyl residues (e.g., Ala, Pro) in prototype MECs.
  • Compared identified MECs with alpha-turns found in proteins, noting that these conformations often occur in isolation, with alpha-helical alpha-turns being most prevalent.

Conclusions:

  • Tetrapeptides can adopt diverse alpha-turn conformations stabilized by various hydrogen bonding patterns.
  • Bifurcated hydrogen bonds and the inclusion of specific residues contribute to conformational flexibility and stability.
  • The computational models provide insights into potential peptide structures relevant to protein folding and design.