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Polyamines and antibiotic effects on translation

S H Goldemberg, I D Algranati

    Medical Biology
    |December 1, 1981
    PubMed
    Summary

    Polyamines are crucial for bacterial protein synthesis. Depriving Escherichia coli of polyamines impairs translation initiation and increases errors, while reducing sensitivity to antibiotics like streptomycin.

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    Area of Science:

    • Molecular Biology
    • Microbiology
    • Genetics

    Background:

    • Polyamines are essential cations that stabilize nucleic acids and influence protein synthesis in bacteria.
    • Polyamine auxotrophs require exogenous polyamines for growth and normal cellular functions.
    • Previous studies indicated polyamines play a role in translation, but the precise mechanisms were unclear.

    Purpose of the Study:

    • To investigate the role of polyamines in protein synthesis in Escherichia coli.
    • To determine the effects of polyamine starvation on ribosomal function and translation fidelity.
    • To examine the impact of polyamine deficiency on bacterial sensitivity to antibiotics.

    Main Methods:

    • Studied protein synthesis in polyamine-auxotrophic Escherichia coli mutants under polyamine-starved conditions.
    • Performed in vivo and in vitro assays to measure protein synthesis rates and analyze synthesized peptides.
    • Assessed the response of polyamine-deficient cells to streptomycin and other aminoglycoside antibiotics.

    Main Results:

    • Polyamine starvation led to a decreased protein synthesis rate due to defective 30S ribosomal subparticles impairing translation initiation.
    • Putrescine-depleted bacteria exhibited increased peptide misreading during protein synthesis.
    • Cells grown without polyamines showed reduced sensitivity to the inhibitory and misreading effects of streptomycin, as well as other aminoglycosides.

    Conclusions:

    • Polyamines are essential for proper 30S ribosomal subunit function and efficient translation initiation in Escherichia coli.
    • Polyamine deficiency compromises translation fidelity, leading to increased errors in protein synthesis.
    • The absence of polyamines alters bacterial susceptibility to aminoglycoside antibiotics, suggesting a link between polyamine status and antibiotic efficacy.

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