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Metal-peptide interactions: enkephalin rigidifications

R Haran, P Sharrock, J Gairin

    International Journal of Peptide and Protein Research
    |October 1, 1982
    PubMed
    Summary

    Nuclear magnetic resonance (NMR) spectroscopy revealed distinct structural differences between acid and amide forms of enkephalin analogues. Metal ion complexation significantly alters the conformation of the acid form, potentially impacting biological activity.

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    Area of Science:

    • Medicinal Chemistry
    • Structural Biology
    • Spectroscopy

    Background:

    • Enkephalin analogues are peptides with potential therapeutic applications.
    • Understanding their conformational dynamics is crucial for drug design.
    • Nuclear magnetic resonance (NMR) spectroscopy is a powerful tool for studying peptide structure.

    Purpose of the Study:

    • To investigate the structural differences between acid and amide forms of two enkephalin analogues using NMR.
    • To explore the effects of pH and solvent composition on their conformation.
    • To analyze the impact of metal ion complexation on their structural properties.

    Main Methods:

    • 13C chemical shift analysis as a function of pH.
    • NMR studies in water-dimethyl sulfoxide solvent mixtures.
    • Investigation of metal ion complexation effects on NMR spectra.

    Main Results:

    • Significant differences observed in NMR features between acid and amide forms.
    • Metal ion complexation induced notable changes in the NMR spectra of the acid form.
    • Temperature dependence of NH proton resonances in zinc complex mimicked the amide analogue.

    Conclusions:

    • Metal ion complexation can induce conformational changes in enkephalin analogues.
    • These conformational modifications may alter the biological activities of the peptides.
    • NMR spectroscopy provides valuable insights into peptide-metal interactions and their structural consequences.

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