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Related Experiment Videos

pi-Stacking interactions. Alive and well in proteins

G B McGaughey1, M Gagné, A K Rappé

  • 1Wyeth-Ayerst Research, Structural Biology, Princeton, New Jersey 08540, USA.

The Journal of Biological Chemistry
|June 23, 1998
PubMed
Summary
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Aromatic amino acids in proteins prefer a parallel-displaced pi-stacking orientation. This interaction is more stable than T-shaped arrangements, offering insights into protein structure and stability.

Area of Science:

  • Structural biology
  • Biochemistry
  • Computational chemistry

Background:

  • Noncovalent interactions between aromatic amino acids are crucial for protein structure and function.
  • Previous studies on aromatic amino acid interactions in proteins have yielded varied results regarding preferred orientations.

Purpose of the Study:

  • To determine the preferred positions and orientations of noncovalent interactions between aromatic amino acid side chains (phenylalanine, tyrosine, histidine, tryptophan) in proteins.
  • To investigate the energetic stability of different aromatic amino acid dimer orientations.

Main Methods:

  • Analysis of high-resolution X-ray crystal structures of nonhomologous proteins.
  • Focus on isolated aromatic amino acid pairs (dimers) to avoid complexities of higher-order clusters.

Related Experiment Videos

  • Comparison of experimental findings with ab initio and molecular mechanics calculations.

    • Main Results:

    • Aromatic amino acid side chains preferentially align in an off-centered parallel orientation, termed parallel-displaced pi-stacking.
    • The parallel-displaced structure is energetically more favorable than T-shaped structures by 0.5-1.0 kcal/mol.
    • Findings align with benzene dimer calculations but contrast with some prior protein analyses.

    Conclusions:

    • The parallel-displaced pi-stacking is the dominant interaction mode for aromatic amino acid dimers in proteins.
    • This preferred orientation contributes to protein stability and influences higher-order structural arrangements.
    • The study provides a refined understanding of aromatic interactions in biological macromolecules.