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Related Experiment Videos

Penicillin-binding proteins in Clostridium perfringens.

T F Murphy, M Barza, J T Park

    Antimicrobial Agents and Chemotherapy
    |December 1, 1981
    PubMed
    Summary

    Penicillin-binding proteins (PBPs) in Clostridium perfringens were identified. PBP 3 and 4 are likely targets for beta-lactam antibiotics, while mecillinam uniquely targets PBP 5.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Pharmacology

    Background:

    • Clostridium perfringens is an important veterinary and human pathogen.
    • Beta-lactam antibiotics are crucial for treating bacterial infections.
    • Understanding antibiotic targets in C. perfringens is essential for effective treatment strategies.

    Purpose of the Study:

    • To investigate the penicillin-binding proteins (PBPs) of Clostridium perfringens.
    • To determine the affinities of various beta-lactam antibiotics for these PBPs.
    • To identify the specific PBPs that serve as targets for beta-lactam-mediated bacterial killing.

    Main Methods:

    • Detection and characterization of PBPs in the cytoplasmic membrane of C. perfringens.
    • Determination of relative affinities of 16 beta-lactam antibiotics for identified PBPs.
    • Assessment of antibiotic concentrations required for PBP saturation and growth inhibition.

    Main Results:

    • Six PBPs (42,000–100,000 molecular weight) were identified in the cytoplasmic membrane.
    • PBP 3 and PBP 4 were saturated by most beta-lactams at their minimal inhibitory concentrations, indicating they are likely killing targets.
    • Mecillinam exhibited unique binding, preferentially targeting PBP 5 and inhibiting growth without saturating PBP 4.
    • All tested beta-lactams induced filament formation in C. perfringens, irrespective of their specific PBP binding patterns.

    Conclusions:

    • PBP 3 and PBP 4 are the primary targets for most beta-lactam antibiotics in Clostridium perfringens.
    • Mecillinam represents a distinct class of beta-lactam targeting PBP 5, offering a potentially different therapeutic approach.
    • The induction of filament formation by all beta-lactams suggests a conserved downstream mechanism of action, possibly related to cell wall synthesis disruption.

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