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Inhibition of reverse transcriptase activity by benzophenanthridine alkaloids

M L Sethi

    Journal of Natural Products
    |March 1, 1979
    PubMed
    Summary
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    Benzophenanthridine alkaloids inhibit reverse transcriptase activity in RNA tumor viruses by interacting with template primers, not the enzyme itself. This interaction instantly halts DNA polymerase synthesis, suggesting a novel antiviral mechanism.

    Area of Science:

    • Biochemistry
    • Virology
    • Pharmacology

    Background:

    • Reverse transcriptase is a key enzyme in RNA tumor viruses.
    • Benzophenanthridine alkaloids are a class of natural compounds with potential biological activities.

    Purpose of the Study:

    • To investigate the inhibitory effects of specific benzophenanthridine alkaloids on reverse transcriptase.
    • To elucidate the mechanism of action for this inhibition.

    Main Methods:

    • Enzyme inhibition assays using polynucleotide-oligodeoxynucleotide complexes as template primers.
    • Determination of 50% inhibitory concentrations (IC50) for various alkaloids.
    • Kinetic analysis of enzyme inhibition.

    Main Results:

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  • Benzophenanthridine alkaloids (fagaronine, O-methylfagaronine, nitidine, allonitidine, methoxydihydronitidine) demonstrated inhibitory activity against reverse transcriptase.
  • Inhibition occurred at concentrations ranging from 6-60 µg/mL.
  • Alkaloids showed preferential interaction with template primers, particularly A:T base pairs, rather than enzyme proteins.
  • Kinetic studies indicated immediate cessation of DNA polymerase synthesis.

    • Conclusions:

    • Benzophenanthridine alkaloids possess significant reverse transcriptase inhibitory properties.
    • The primary mechanism involves interaction with template primers, disrupting DNA synthesis.
    • These findings suggest potential therapeutic applications of benzophenanthridine alkaloids against RNA tumor viruses.