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Related Experiment Videos

Solution conformation of a model hexapeptide containing RGD sequence.

M M Dhingra1

  • 1Chemical Physics Group, Tata Institute of Fundamental Research, Bombay, India.

Indian Journal of Biochemistry & Biophysics
|December 1, 1992
PubMed
Summary

NMR spectroscopy reveals that the hexapeptide DRGDSG exists as a mix of extended and folded structures in both DMSO and aqueous solutions. These findings suggest flexibility in the RGD sequence, similar to its behavior in proteins.

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Area of Science:

  • Biochemistry
  • Chemical Physics
  • Molecular Biology

Background:

  • The Arg-Gly-Asp (RGD) motif is crucial for cell adhesion and is found in various proteins.
  • Understanding the solution conformation of RGD-containing peptides is essential for elucidating their biological functions.

Purpose of the Study:

  • To investigate the solution conformation of a model hexapeptide, Asp-Arg-Gly-Asp-Ser-Gly (DRGDSG), which contains the RGD sequence.
  • To determine the conformational dynamics of the DRGDSG peptide in different solvent environments using NMR spectroscopy.

Main Methods:

  • 1H Nuclear Magnetic Resonance (NMR) spectroscopy was employed to study the peptide in DMSO-d6 and aqueous solution (H2O:D2O/90:10%).
  • Two-dimensional COSY and NOESY experiments were used for unambiguous identification of spin systems and sequence-specific assignment of proton resonances.

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  • Analysis of temperature coefficients, vicinal coupling constants (3JNH-CαH), and NOESY/ROESY data provided insights into the peptide's conformation.

    • Main Results:

    • The DRGDSG peptide exists as a blend of conformers in both solvents, exhibiting both beta-sheet-like extended backbone structures and folded conformations.
    • Intramolecular hydrogen bonding does not appear to stabilize the observed folded conformers.
    • The conformational flexibility observed in the DRGDSG peptide is consistent with findings from NMR studies on echistatin, a protein containing the RGD motif.

    Conclusions:

    • The DRGDSG peptide displays significant conformational flexibility in solution, existing as an ensemble of structures.
    • The study provides valuable insights into the conformational behavior of RGD-containing peptides, relevant to their biological interactions.
    • The findings support the hypothesis that the RGD segment's flexibility contributes to its functional role in protein-mediated cell adhesion.