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Peptide models for beta-turns. A circular dichroism study.

M Crisma, G D Fasman, H Balaram

    International Journal of Peptide and Protein Research
    |April 1, 1984
    PubMed
    Summary
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    Circular dichroism (CD) spectroscopy reveals diverse beta-turn structures in model peptides. Solvent conditions significantly influence peptide conformation, affecting secondary structure formation and stability.

    Area of Science:

    • Biochemistry
    • Spectroscopy
    • Structural Biology

    Background:

    • Beta-turns are crucial secondary structures in peptides and proteins.
    • Understanding beta-turn formation is key to peptide and protein folding.
    • Model peptides provide insights into conformational preferences.

    Purpose of the Study:

    • To investigate the conformational behavior of four beta-turn model peptides.
    • To analyze the influence of solvent conditions on peptide secondary structures.
    • To characterize different types of beta-turns using circular dichroism (CD) spectroscopy.

    Main Methods:

    • Circular dichroism (CD) spectroscopy was employed.
    • Four model peptides (Z-Aib-Pro-Aib-Pro-OMe, Piv-Pro-Aib-NHMe, Piv-Pro-D-Ala-NHMe, Piv-Pro-Val-NHMe) were studied.

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  • Experiments were conducted in various solvents including methanol, hexafluoroisopropanol, and cyclohexane.

    • Main Results:

    • Type I and Type II beta-turns were observed in the solid state for peptides 1 and 2.
    • Peptide 1 exhibited a class C spectrum in solution, suggesting a variant Type I (III) structure.
    • Peptide 2 showed solvent-dependent CD spectra, consistent with Type II, III, and V reverse turns.
    • Piv-Pro-Val-NHMe adopted non-beta-turn structures in polar solvents but suggested Type I beta-turns in cyclohexane.

    Conclusions:

    • Beta-turn structures are sensitive to solvent environments.
    • CD spectroscopy is effective in differentiating beta-turn types and solvent effects.
    • Model peptide studies contribute to understanding peptide conformational dynamics.