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Related Experiment Videos

Ordered conformations of cationic polypeptides in anionic surfactant solutions

K Ikeda, J T Yang

    International Journal of Peptide and Protein Research
    |September 1, 1980
    PubMed
    Summary

    Ionic poly(L-ornithine) and poly(L-lysine) exhibit distinct conformational changes in response to anionic surfactants. Poly(L-lysine) undergoes a pH-dependent beta-to-helix transition in specific surfactant solutions.

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    Area of Science:

    • Biochemistry
    • Polymer Science
    • Spectroscopy

    Background:

    • Polypeptides like poly(L-ornithine) and poly(L-lysine) can adopt different conformations.
    • Anionic surfactants are known to influence polypeptide structures.

    Purpose of the Study:

    • To investigate the conformational behavior of ionic polypeptides in the presence of various anionic surfactants.
    • To compare the structural responses of poly(L-ornithine) and poly(L-lysine) under different conditions.

    Main Methods:

    • Circular dichroic (CD) spectroscopy was used to monitor polypeptide conformations.
    • Experiments were conducted at a controlled temperature of 45 degrees Celsius.
    • Varying pH conditions were applied to observe transitions.

    Main Results:

    • Poly(L-ornithine) adopted a helical conformation in sodium dodecyl sulfonate, phosphate, and sulfate solutions, but remained unordered in sodium tridecanate.
    • Poly(L-lysine) consistently assumed a beta-form in all tested anionic surfactant solutions.
    • Poly(L-lysine) exhibited a pH-dependent beta-to-helix transition in sodium dodecyl phosphate and sulfate solutions at 45 degrees Celsius.

    Conclusions:

    • The conformational response of ionic polypeptides to anionic surfactants is sequence-dependent.
    • Specific surfactant structures and pH play critical roles in inducing conformational transitions in poly(L-lysine).
    • The study highlights the complex interplay between polypeptide structure, surfactant properties, and environmental conditions.

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