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Thermolysin-catalyzed peptide bond synthesis.

S I Wayne, J S Fruton

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1983
    PubMed
    Summary

    Thermolysin enzyme efficiently synthesizes peptides, favoring hydrophobic amino acids for enhanced reaction rates. This peptide synthesis mechanism involves synergistic binding at the enzyme’s active site, particularly in the transition-state complex.

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    Area of Science:

    • Enzymology
    • Biocatalysis
    • Protein Chemistry

    Background:

    • Thermolysin is a metalloproteinase enzyme known for its catalytic activity in peptide bond hydrolysis.
    • Understanding enzyme specificity is crucial for developing biocatalytic processes in peptide synthesis.

    Purpose of the Study:

    • To investigate the kinetic parameters and substrate specificity of thermolysin during peptide synthesis.
    • To elucidate the mechanism of thermolysin-catalyzed peptide bond formation.

    Main Methods:

    • High-performance liquid chromatography (HPLC) was used to determine reaction rates.
    • Kinetic studies involved varying N-substituted amino acids, peptides, and amine components.
    • Apparent kcat and Km values were determined for kinetic analysis.

    Main Results:

    • Thermolysin exhibits a preference for hydrophobic L-amino acids as carbonyl donors in peptide synthesis.
    • Adjacent hydrophobic residues significantly enhance the rate of peptide bond formation.
    • Kinetic data suggest a rapid-equilibrium random bi-reactant mechanism forming ternary enzyme-substrate complexes.

    Conclusions:

    • The synergistic binding of reactants at the active site is a key feature of thermolysin-catalyzed peptide synthesis.
    • The observed synergism is primarily expressed at the transition-state complex level, influencing catalytic efficiency.

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