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Enzyme substrate and inhibitor interactions.

D M Blow, J M Smith

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |November 6, 1975
    PubMed
    Summary
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    Enzymes bind substrates most effectively in their transition state, lowering activation energy through entropy-driven interactions. This enzyme-substrate binding mechanism, exemplified by trypsin, allows for predictable specificity based on tertiary structure.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Structural Biology

    Background:

    • Enzymes catalyze reactions by binding substrates, with optimal binding occurring at the transition state.
    • This transition-state stabilization significantly reduces the activation energy, forming the basis of enzyme catalysis.
    • Entropic contributions are a major driving force in enzyme-substrate interactions.

    Purpose of the Study:

    • To elucidate the catalytic mechanism of enzymes, focusing on transition-state binding.
    • To analyze the energetic contributions and structural basis of enzyme-substrate interactions.
    • To investigate enzyme specificity using trypsin and its inhibitors as a model system.

    Main Methods:

    • Structural analysis of enzyme-inhibitor complexes.

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  • Assessment of binding energy contributions, particularly entropic effects.
  • Comparison of enzyme active site structure with substrate orientation.

    • Main Results:

    • Enzymes bind substrates most tightly in the transition state, reducing activation energy.
    • Trypsin's binding site orients substrates for optimal reaction, with the enzyme acting as a rigid body.
    • High specificity in enzyme-inhibitor interactions (e.g., trypsin-trypsin inhibitor) was observed and structurally characterized.

    Conclusions:

    • Enzyme catalytic mechanisms are fundamentally linked to transition-state stabilization.
    • The tertiary structure of an enzyme dictates substrate binding and specificity.
    • Enzyme specificity can be predicted from detailed structural knowledge, especially when conformational changes are minimal.