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Computer simulations of cyclic enkephalin analogues.

M Hassan, M Goodman

    Biochemistry
    |November 18, 1986
    PubMed
    Summary

    Cyclic enkephalin analogues with retro-inverso modifications show reduced ring motion and distinct hydrogen bonding patterns. These molecular dynamics simulations reveal key conformational changes impacting peptide structure.

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    Area of Science:

    • Computational chemistry
    • Molecular modeling
    • Medicinal chemistry

    Background:

    • Enkephalins are endogenous opioid peptides with therapeutic potential.
    • Cyclic modifications and retro-inverso inversions are strategies to enhance peptide stability and activity.
    • Understanding the conformational dynamics of these modified analogues is crucial for drug design.

    Purpose of the Study:

    • To investigate the conformational dynamics and hydrogen bonding patterns of cyclic enkephalin analogues with retro-inverso modifications.
    • To elucidate the impact of cyclization and retro-inverso residues on molecular mobility and structure.
    • To identify low-energy conformations relevant for potential pharmacological applications.

    Main Methods:

    • Molecular dynamics (MD) simulations were performed on cyclic enkephalin analogues.
    • Energy minimization studies were conducted using conformations from MD and systematic searches.
    • Analysis focused on ring mobility, conformational transitions, and hydrogen bonding.

    Main Results:

    • Cyclization significantly reduced the motion of the 14-membered ring structures.
    • Time-correlated conformational transitions and reorientation of peptide units were observed.
    • Hydrogen bonds predominantly formed C7 structures, with additional C6 and C8 structures due to retro-inverso residues.

    Conclusions:

    • Retro-inverso modifications and cyclization influence the conformational landscape of enkephalin analogues.
    • These structural changes, particularly hydrogen bonding patterns, are critical for understanding their stability and potential biological activity.
    • The identified low-energy conformations provide insights for the rational design of novel peptide-based therapeutics.

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