Mildiomycin: a nucleoside antibiotic that inhibits protein synthesis

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Published on: August 31, 2015

E Feduchi, M Cosín, L Carrasco

    The Journal of Antibiotics
    |March 1, 1985
    PubMed

    Insights

    Mildiomycin selectively inhibits protein synthesis by blocking the peptidyl-transferase center. This nucleoside antibiotic shows limited cell membrane permeability, impacting translation in various cell-free systems.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Microbiology

    Background:

    • Mildiomycin is a novel nucleoside antibiotic.
    • Understanding its mechanism of action is crucial for antibiotic development.

    Purpose of the Study:

    • To investigate the selective inhibition of protein synthesis by mildiomycin.
    • To determine the cellular targets and membrane permeability of mildiomycin.
    • To elucidate the precise mode of action of mildiomycin at the molecular level.

    Main Methods:

    • Protein synthesis inhibition assays in HeLa cells.
    • RNA and DNA synthesis inhibition assays.
    • Cell permeabilization using encephalomyocarditis virus.
    • Cell-free translation systems (rabbit reticulocyte lysate, poly(U)-directed polyphenylalanine synthesis).

    Main Results:

    • Mildiomycin selectively inhibits protein synthesis in HeLa cells, with minimal effect on RNA or DNA synthesis.
    • Enhanced inhibition in permeabilized cells suggests poor cell membrane penetration.
    • Inhibition of translation was confirmed in cell-free systems.
    • Mildiomycin appears to block the peptidyl-transferase center, inhibiting peptide bond formation.

    Conclusions:

    • Mildiomycin is a potent inhibitor of protein synthesis, targeting the peptidyl-transferase center.
    • Its limited cell membrane permeability influences its activity and suggests specific transport mechanisms or limitations.
    • The findings provide insights into the molecular mechanism of mildiomycin, relevant for antibiotic research.

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