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Related Experiment Videos

The active centres in penicillin-sensitive enzymes.

J M Ghuysen, J M Frère, M Leyh-Bouille

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |May 16, 1980
    PubMed
    Summary

    Beta-lactam antibiotics interact with penicillin-sensitive enzymes through a multi-step process involving specific binding sites. This interaction leads to enzyme acylation and regeneration, crucial for antibiotic function.

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    Area of Science:

    • Biochemistry
    • Pharmacology
    • Enzymology

    Background:

    • Beta-lactam antibiotics are critical therapeutics targeting bacterial cell wall synthesis.
    • Penicillin-sensitive enzymes are key players in the mechanism of action of these antibiotics.
    • Understanding the detailed molecular interactions is vital for antibiotic development and overcoming resistance.

    Purpose of the Study:

    • To elucidate the step-by-step molecular interactions between beta-lactam antibiotics and penicillin-sensitive enzymes.
    • To characterize the roles of distinct binding sites and their influence on enzyme activity.
    • To compare the mechanisms of enzyme interaction with beta-lactam antibiotics and peptide substrates.

    Main Methods:

    • Detailed analysis of the multi-step binding and acylation process.

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  • Identification and characterization of specific binding sites (site 1, 2, and 3) on the enzyme.
  • Investigation of enzyme regeneration pathways and acyl-enzyme complex stability.
  • Comparison of enzyme mechanisms for beta-lactam antibiotics and D-alanyl-D-alanine (D-Ala-D-Ala) peptides.

    • Main Results:

    • Beta-lactam binding involves sequential interactions at binding site 1, followed by site 2, inducing catalytic activity at site 1.
    • Acylation of a serine residue stabilizes the acyl-enzyme complex via interaction with binding site 3.
    • Enzyme regeneration occurs through direct moiety elimination or metabolite splitting.
    • Enzymes exhibit distinct mechanisms for processing beta-lactams and D-Ala-D-Ala peptides, with varying degrees of active site independence.

    Conclusions:

    • The interaction between beta-lactam antibiotics and penicillin-sensitive enzymes is a complex, multi-step process involving precise molecular recognition.
    • Distinct binding sites and their dynamic interplay dictate the enzyme's catalytic activity and substrate processing.
    • Understanding these mechanisms provides insights into antibiotic efficacy and potential resistance strategies.