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Related Experiment Videos

Conformation of physalaemin.

J L Bernier, J P Hénichart, N Helbecque

    European Journal of Biochemistry
    |July 16, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Physalaemin, a biologically active undecapeptide, adopts a stable molecular structure in solution. This stable conformation, revealed by NMR, provides insights into its interaction with biological receptors.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Medicinal Chemistry

    Background:

    • Physalaemin is a biologically active undecapeptide.
    • Understanding its molecular structure is crucial for receptor interaction.
    • Shorter fragments of physalaemin lack a stable conformation.

    Purpose of the Study:

    • To determine the conformational and spatial configuration of physalaemin.
    • To investigate the molecular structure of physalaemin in solution.
    • To gain insight into the conformation required for tachykinin receptor interaction.

    Main Methods:

    • 350-MHz proton nuclear magnetic resonance (1H NMR) spectroscopy was employed.
    • NMR analyses were used to study hydrogen bonding and molecular interactions.

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  • The study focused on identifying intramolecular bondings within the peptide.

    • Main Results:

    • A strong hydrogen bond was identified between Phe7 amide proton and the Pro4 carbonyl group.
    • Additional postulated bondings involve Lys6, Asn5, Asp3, and the Met-NH2 terminus.
    • Physalaemin exhibits a stable molecular structure in solution, unlike its fragments.

    Conclusions:

    • Physalaemin possesses a stable, defined three-dimensional structure in solution.
    • This stable conformation is likely essential for its biological activity at tachykinin receptors.
    • The findings offer insights into the structural requirements for receptor binding.