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Related Experiment Videos

Peroxidase-catalyzed benzidine binding to DNA and other macromolecules.

Y Tsuruta, P D Josephy, A D Rahimtula

    Chemico-Biological Interactions
    |July 1, 1985
    PubMed
    Summary

    Benzidine, a carcinogen, binds irreversibly to DNA when oxidized by peroxidase and hydrogen peroxide. Antioxidants and biological hydrogen donors can prevent this DNA binding, offering protective mechanisms against benzidine-induced DNA damage.

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    Area of Science:

    • Biochemistry
    • Toxicology
    • Molecular Biology

    Background:

    • Benzidine is a known carcinogen.
    • Oxidation of benzidine can lead to DNA binding.
    • Understanding the mechanism of DNA binding is crucial for risk assessment.

    Purpose of the Study:

    • To investigate the mechanism of benzidine binding to DNA.
    • To identify factors influencing benzidine-DNA adduct formation.
    • To explore protective strategies against benzidine-induced DNA damage.

    Main Methods:

    • Peroxidase/H2O2 oxidation of [14C]benzidine.
    • Incubation with exogenous DNA and synthetic polynucleotides.
    • Quantification of benzidine binding using radiolabeling and spectrophotometry.

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  • Assessment of protective effects of antioxidants and hydrogen donors.

    • Main Results:

    • Benzidine is rapidly oxidized to products that bind irreversibly to DNA.
    • Exogenous DNA and polyriboguanylic acid were effective in binding benzidine.
    • Binding correlated with absorbance at 295 nm and 390 nm.
    • Carcinogenic benzidine derivatives bound to DNA, while a non-carcinogen did not.
    • Biological hydrogen donors, thiols, and phenolic antioxidants prevented binding.

    Conclusions:

    • The peroxidase/H2O2 system mediates the formation of DNA-binding benzidine species.
    • The guanine content of nucleic acids influences benzidine binding.
    • Antioxidants and reducing agents can interfere with benzidine-DNA adduct formation, suggesting protective mechanisms.