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Microscopic diffusion-reaction coupling in steady-state enzyme kinetics.

O G Berg, M Ehrenberg

    Biophysical Chemistry
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    This study applies diffusion-controlled processes to enzymatic reactions, revealing that enzyme saturation affects steady-state descriptions. Microscopic analysis provides a more accurate view, especially for fast enzymes, justifying simpler macroscopic models in most cases.

    Area of Science:

    • Biochemistry
    • Chemical Kinetics
    • Physical Chemistry

    Background:

    • Enzymatic reactions are fundamental to biological processes.
    • Understanding steady-state kinetics is crucial for enzyme characterization.
    • Diffusion limitations can significantly impact reaction rates.

    Purpose of the Study:

    • To apply diffusion-controlled process theory to reversible enzymatic reactions.
    • To analyze the impact of enzyme saturation on steady-state conditions.
    • To compare microscopic diffusion-reaction coupling with standard macroscopic treatments.

    Main Methods:

    • Utilizing the theory of diffusion-controlled processes.
    • Employing a microscopic approach to diffusion-reaction coupling.
    • Analyzing conditional concentration distributions of substrate and product.

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  • Time-averaging non-stationary conditional distributions to describe the steady state.

    • Main Results:

    • The steady state of enzymatic reactions is described as a weighted sum of time-averaged non-stationary distributions.
    • Enzyme saturation introduces complexities in concentration distributions.
    • Microscopic analysis reveals relaxation effects as enzymes shift between occupied and unoccupied states.
    • Deviations from standard treatments arise for fast enzymes with irreversible product release.

    Conclusions:

    • The microscopic diffusion-reaction coupling provides a more detailed understanding of enzymatic steady states.
    • Standard macroscopic models are generally justified but have limitations for specific enzyme types.
    • The findings impact the assessment of parameters derived from Lineweaver-Burk plots.