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Naphthyridinomycin, a DNA-reactive antibiotic

M J Zmijewski, K Miller-Hatch, M Goebel

    Antimicrobial Agents and Chemotherapy
    |May 1, 1982
    PubMed
    Summary

    Naphthyridinomycin, a novel quinone antibiotic from Streptomyces lusitanus, inhibits bacterial growth by binding to DNA. This antibiotic specifically targets the DNA template, similar to saframycins, thereby halting DNA synthesis.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Antibiotic Research

    Background:

    • Naphthyridinomycin is a novel quinone antibiotic produced by Streptomyces lusitanus.
    • Fermentation studies indicate maximal antibiotic production at 96 hours of cell growth.

    Purpose of the Study:

    • To determine the mechanism of action of naphthyridinomycin.
    • To investigate the interaction of naphthyridinomycin with bacterial DNA.

    Main Methods:

    • Fermentation of Streptomyces lusitanus to produce naphthyridinomycin.
    • Use of radioactively labeled naphthyridinomycin for in vitro studies.
    • Assessing the effect of naphthyridinomycin on DNA synthesis and DNA-templated enzymatic reactions.

    Main Results:

    • Naphthyridinomycin inhibits bacterial growth primarily by inhibiting DNA synthesis.
    • Naphthyridinomycin specifically binds to calf thymus DNA, an interaction enhanced by sulfhydryl compounds like dithiothreitol.
    • DNA-naphthyridinomycin complexes are poor substrates for DNA and RNA synthesis enzymes.

    Conclusions:

    • Naphthyridinomycin's mechanism of action involves specific binding to the DNA template.
    • This DNA binding inhibits DNA synthesis, leading to the observed inhibition of bacterial growth.
    • Naphthyridinomycin shares similarities in DNA reactivity with saframycins.

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