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Bacterial resistance to streptothricins.

I Haupt, H Thrum

    Journal of Basic Microbiology
    |January 1, 1985
    PubMed
    Summary

    Streptothricin resistance mechanisms differ in bacteria. While one E. coli mutant showed cross-resistance to aminoglycosides, others with modifying enzymes were sensitive, unlike the producing bacteria which inactivate streptothricin.

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    Area of Science:

    • Microbiology
    • Bacterial genetics
    • Antibiotic resistance

    Background:

    • Streptothricin is an antibiotic with a distinct mode of action.
    • Understanding bacterial resistance mechanisms is crucial for antibiotic development.
    • Aminoglycosides are a class of antibiotics often associated with specific resistance pathways.

    Purpose of the Study:

    • To investigate the mechanisms of bacterial resistance to streptothricin.
    • To compare streptothricin resistance with aminoglycoside resistance in E. coli.
    • To identify enzymatic inactivation of streptothricin in its producing organism.

    Main Methods:

    • Induction of a streptothricin-resistant E. coli mutant.
    • Testing cross-resistance patterns with aminoglycosides and other antibiotics.
    • Characterization of resistance mechanisms in naturally aminoglycoside-resistant E. coli strains.
    • Enzymatic assay for streptothricin inactivation in Streptomyces noursei.

    Main Results:

    • A laboratory-induced E. coli mutant (A19 Stcr 2/2/1) exhibited high cross-resistance to aminoglycosides and miscoding antibiotics.
    • E. coli strains resistant to aminoglycosides via plasmid-encoded enzymes were sensitive to streptothricin.
    • Streptomyces noursei (NG13) inactivated streptothricin by acetylation.
    • Streptomyces noursei showed no cross-resistance to miscoding aminoglycosides.

    Conclusions:

    • Bacterial resistance to streptothricin is mechanistically distinct from common aminoglycoside resistance pathways.
    • Plasmid-mediated aminoglycoside-modifying enzymes do not confer resistance to streptothricin.
    • Enzymatic inactivation is a key resistance strategy for streptothricin in its producing species.

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