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Nonintercalative DNA-binding antitumour compounds.

B C Baguley

    Molecular and Cellular Biochemistry
    |April 2, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Compounds that bind DNA without intercalation were identified. These non-intercalative DNA-binding agents, including antibiotics and synthetic antitumour drugs, likely act by binding to the minor groove of DNA.

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    Area of Science:

    • Molecular Biology
    • Medicinal Chemistry
    • Biophysics

    Background:

    • A distinct class of compounds exhibits reversible, non-intercalative binding to double-stranded DNA.
    • This binding mechanism differs from traditional DNA-intercalating agents.

    Purpose of the Study:

    • To define and characterize compounds that bind DNA non-intercalatively.
    • To investigate the structural requirements for DNA binding and biological activity in this compound family.
    • To elucidate the mechanism of action for antitumour agents within this class.

    Main Methods:

    • Characterization of non-intercalative DNA binding using ultraviolet spectrometry, fluorimetry (ethidium probe), viscometry, hydrodynamic techniques, circular dichroism, and nuclear magnetic resonance spectrometry.
    • Survey of general requirements for DNA binding and biological activity.

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  • Analysis of drug-DNA interactions.

    • Main Results:

    • Established a family of compounds with reversible, non-intercalative DNA binding.
    • Identified antibiotics (distamycin A, netropsin, mithramycin, chromomycin, olivomycin) and synthetic antitumour agents (diarylamidines, phthalanilides, etc.) within this family.
    • Proposed minor groove binding as the likely mechanism for antitumour activity.

    Conclusions:

    • Non-intercalative DNA binding is a significant mechanism for drug action.
    • Minor groove binding of these compounds is the probable basis for their antitumour effects.
    • Further research into this class of compounds could yield novel therapeutic agents.