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Antipain lethality to Escherichia coli: dependence upon cyclic adenosine 3',5'-monophosphate and its receptor protein

P A Swenson

    Journal of Bacteriology
    |August 1, 1979
    PubMed

    Insights

    Antipain exhibits lethal effects on Escherichia coli K-12 cells, but only when cyclic adenosine 3

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Bacteriology

    Background:

    • Escherichia coli K-12 is a widely studied bacterial model organism.
    • Cyclic adenosine 3',5'-monophosphate (cAMP) and its receptor protein (CRP) are crucial regulators of gene expression in bacteria.
    • The precise mechanisms of action for certain antimicrobial agents remain incompletely understood.

    Purpose of the Study:

    • To investigate the mechanism of action of antipain on Escherichia coli K-12.
    • To determine the role of cyclic adenosine 3',5'-monophosphate (cAMP) and the cAMP receptor protein (CRP) in antipain-induced bacterial cell death.

    Main Methods:

    • Treatment of Escherichia coli K-12 wild-type and mutant strains (delta cya, crp) with antipain.
    • Addition of exogenous cyclic adenosine 3',5'-monophosphate (cAMP) to treated mutant strains.
    • Monitoring of bacterial cell viability over time.

    Main Results:

    • Antipain induced exponential killing of wild-type Escherichia coli K-12 cells starting one hour post-addition.
    • Antipain did not affect the viability of delta cya and crp mutant strains.
    • Supplementation with cyclic adenosine 3',5'-monophosphate (cAMP) restored antipain-induced killing in delta cya mutants, but not in crp mutants.

    Conclusions:

    • The lethal effect of antipain on Escherichia coli K-12 is dependent on the presence and function of cyclic adenosine 3',5'-monophosphate (cAMP).
    • The cAMP receptor protein (CRP) is essential for antipain to exert its killing effect.
    • Antipain's mechanism of action involves the cAMP-CRP regulatory pathway.

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