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Colicin V-treated Escherichia coli does not generate membrane potential

C C Yang, J Konisky

    Journal of Bacteriology
    |May 1, 1984
    PubMed

    Insights

    Colicin V disrupts proline transport and membrane potential in Escherichia coli. This colicin targets the bacterial cytoplasmic membrane, impairing essential cellular functions.

    Area of Science:

    • Microbiology
    • Bacterial Physiology
    • Molecular Biology

    Background:

    • Escherichia coli is a model organism for studying bacterial physiology.
    • Colicins are bacteriocins produced by bacteria that exhibit antimicrobial activity.
    • Understanding the mechanisms of colicin action is crucial for developing new antibacterial strategies.

    Purpose of the Study:

    • To investigate the effects of Colicin V on the function of Escherichia coli.
    • To determine the specific cellular targets of Colicin V action.

    Main Methods:

    • Treatment of Escherichia coli with purified Colicin V.
    • Assays to measure active proline transport.
    • Measurement of membrane potential in whole cells and isolated cytoplasmic membrane vesicles.

    Main Results:

    • Colicin V treatment inhibited active proline transport in Escherichia coli.
    • Colicin V prevented the generation of membrane potential in treated bacteria.
    • Colicin V also inhibited membrane potential formation in isolated cytoplasmic membrane vesicles.

    Conclusions:

    • Colicin V primarily targets the cytoplasmic membrane of Escherichia coli.
    • Disruption of membrane potential is a key mechanism of Colicin V toxicity.
    • Colicin V interferes with essential membrane functions, leading to bacterial inhibition.

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