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Methadone conformation and opioid activity.

W L Duax, G D Smith, J F Griffin

    Science (New York, N.Y.)
    |April 22, 1983
    PubMed
    Summary
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    Inactive and active methadone analogs adopt distinct solid-state conformations. The active form, (-)-erythro-5-methylmethadone, displays an unusual conformation suggesting it is the biologically relevant structure for opioid receptor binding.

    Area of Science:

    • Pharmacology
    • Medicinal Chemistry
    • Structural Biology

    Background:

    • Methadone analogs are crucial in pain management and addiction treatment.
    • Understanding the structure-activity relationship of methadone is key to developing safer and more effective analgesics.
    • Previous studies have not fully elucidated the conformational requirements for opioid receptor binding.

    Purpose of the Study:

    • To investigate the solid-state conformations of methadone analogs.
    • To correlate specific conformations with opioid agonism.
    • To identify the active conformation of methadone analogs at the opioid receptor.

    Main Methods:

    • X-ray crystallography was used to determine the solid-state structures of threo-5-methylmethadone and (-)-erythro-5-methylmethadone.

    Related Experiment Videos

  • In vitro and in vivo assays were performed to assess the opioid agonism of the analogs.

    • Main Results:

    • The inactive analog, threo-5-methylmethadone, adopted an antiperiplanar conformation of the nitrogen atom relative to C(4).
    • The potent agonist, (-)-erythro-5-methylmethadone, exhibited a distinct conformation with the nitrogen atom rotated towards the phenyl rings.
    • This unusual conformation in the active analog suggests its importance for receptor interaction.

    Conclusions:

    • The solid-state conformation of methadone analogs is critical for their opioid activity.
    • The active conformation of methadone analogs at the opioid receptor is likely the one observed in (-)-erythro-5-methylmethadone.
    • These findings provide insights into the pharmacophore of opioid agonists and can guide the design of new analgesics.