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Solution conformations of valinomycin-divalent cation complexes.

M B Sankaram, K R Easwaran

    International Journal of Peptide and Protein Research
    |June 1, 1985
    PubMed
    Summary
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    Valinomycin forms different complexes with metal ions like magnesium and strontium, influenced by cation size and coordination. These findings help understand ion-carrier interactions.

    Area of Science:

    • Biophysical Chemistry
    • Structural Biology
    • Supramolecular Chemistry

    Background:

    • Valinomycin is a cyclic peptide antibiotic known for its selective binding to potassium ions.
    • Understanding how valinomycin interacts with other cations is crucial for its applications in ion transport and sensing.
    • Previous studies have explored complexes of valinomycin with various alkali and alkaline earth metal ions.

    Purpose of the Study:

    • To investigate the solution conformations of valinomycin complexes with magnesium (Mg2+) and strontium (Sr2+) ions.
    • To compare these conformations with those of previously studied lithium (Li+), calcium (Ca2+), manganese (Mn2+), and barium (Ba2+) complexes.
    • To elucidate the relationship between cation properties (ionic radius, coordination number) and valinomycin complex formation.

    Main Methods:

    Related Experiment Videos

    • Circular Dichroism (CD) spectroscopy
    • Nuclear Magnetic Resonance (NMR) spectroscopy
    • Infrared (IR) spectroscopy

    Main Results:

    • Magnesium (Mg2+) and strontium (Sr2+) ions form 2:1 (ion sandwich) and 1:1 (carrier-cation) complexes with valinomycin in solution.
    • The 1:1 complex conformation differs from that of the valinomycin-potassium (K+) complex.
    • Lithium (Li+) exclusively forms a 1:1 complex.
    • Strontium (Sr2+) and barium (Ba2+) also form 1:2 complexes with open, rapidly interconverting conformations.
    • Cations with coordination numbers around six (Mg2+, Ca2+) favor 2:1 and 1:1 complexes.
    • Cations with higher coordination numbers (Sr2+, Ba2+) additionally form 1:2 complexes.

    Conclusions:

    • The type and conformation of valinomycin-cation complexes are dictated by the specific cation's ionic radius and coordination preferences.
    • Valinomycin exhibits distinct binding modes depending on the cation, influencing its conformational flexibility.
    • These findings provide insights into the molecular basis of ion selectivity and complexation by ionophores.