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Structure of gramicidin A.

B A Wallace

    Biophysical Journal
    |January 1, 1986
    PubMed
    Summary

    Gramicidin A forms monovalent cation channels in membranes. Structural studies using spectroscopy and X-ray diffraction reveal its helical dimer conformation, crucial for channel function and ion binding.

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    Area of Science:

    • Biophysics
    • Structural Biology
    • Membrane Protein Structure

    Background:

    • Gramicidin A is a hydrophobic polypeptide forming monovalent cation-specific channels in phospholipid membranes.
    • Previous studies utilized Nuclear Magnetic Resonance (NMR) and Circular Dichroism (CD) spectroscopy to investigate its conformation and ion binding effects.

    Purpose of the Study:

    • To elucidate the three-dimensional structure of gramicidin A in a functional conformation.
    • To investigate the structural basis of gramicidin A's ion channel activity.

    Main Methods:

    • X-ray diffraction of single crystals of a gramicidin/cesium complex.
    • Single wavelength anomalous scattering (SWAS) for phasing.
    • Spectroscopic techniques including NMR and CD spectroscopy.
    • Co-crystallization of gramicidin with lipids.

    Main Results:

    • Determined the 3D structure of a gramicidin/cesium complex, revealing a left-handed double helix.
    • This crystal structure represents an intermediate in the folding and membrane insertion process.
    • Identified gramicidin conformations sensitive to environmental changes and ion binding.

    Conclusions:

    • Combined spectroscopic and diffraction methods provide insights into gramicidin A's structure and function.
    • The determined helical dimer structure is relevant to its membrane channel conformation.
    • Further investigations of gramicidin-lipid co-crystals aim to confirm the functional membrane channel structure.

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