Induction of beta-lactamase in Proteus vulgaris

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A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
11:36

A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing

Published on: July 3, 2016

K Okonogi, M Kuno, E Higashide

    Journal of General Microbiology
    |January 1, 1986
    PubMed

    Insights

    Beta-lactam antibiotics induce beta-lactamase in Proteus vulgaris. Enzyme activity differences between strains are due to varying synthesis rates, not enzyme properties, impacting antibiotic resistance.

    Area of Science:

    • Microbiology
    • Enzymology
    • Biochemistry

    Background:

    • Beta-lactam antibiotics are crucial therapeutics.
    • Beta-lactamase enzymes confer bacterial resistance.
    • Proteus vulgaris is a relevant model organism.

    Purpose of the Study:

    • Investigate beta-lactamase induction in Proteus vulgaris.
    • Characterize beta-lactamase properties and kinetics.
    • Determine factors influencing enzyme activity variations.

    Main Methods:

    • Induction of beta-lactamase using various beta-lactam antibiotics.
    • Characterization of enzyme properties (isoelectric points, specific activity, substrate specificity, Michaelis constants).
    • Kinetic analysis of enzyme formation using double reciprocal plots.

    Main Results:

    • Proteus vulgaris strains produced a single beta-lactamase when induced by benzylpenicillin.
    • Beta-lactamases were heterogeneous in isoelectric points but similar in specific activity, substrate specificity, and Michaelis constants.
    • Enzyme synthesis rates varied significantly between strains, affecting overall beta-lactamase activity.

    Conclusions:

    • Beta-lactamase activity in Proteus vulgaris is primarily determined by the rate of enzyme synthesis.
    • Differences in enzyme properties do not account for activity variations between strains.
    • Understanding these kinetics is vital for antibiotic resistance research.

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