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Related Experiment Videos

Some general principles in free energy transduction.

T L Hill

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

    Standard chemical potentials of bound ligands cannot track free energy transfer in biological cycles. This is because the enzyme-ligand interaction free energy is indivisible, making separate ligand free energies undefined until the cycle is complete.

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    Area of Science:

    • Biochemistry
    • Chemical Thermodynamics

    Background:

    • Free energy transduction cycles are crucial in biological processes.
    • Understanding energy transfer between ligands and enzymes is complex.

    Purpose of the Study:

    • To clarify the limitations of using standard chemical potentials for tracking stepwise free energy transfer in biological cycles.
    • To explain why enzyme-ligand interaction free energy is indivisible.

    Main Methods:

    • Conceptual analysis of free energy definitions in biological systems.
    • Examination of enzyme-ligand complex thermodynamics.

    Main Results:

    • Standard chemical potentials are inadequate for tracking step-by-step free energy transfer within a cycle.
    • Separate ligand free energies are only well-defined when the enzyme is not part of the system (i.e., at the complete cycle level).
    • Enzyme-ligand interaction free energy is mutual and indivisible when both are bound.

    Conclusions:

    • The indivisible nature of enzyme-ligand interaction free energy prevents the step-by-step tracking of energy transfer using standard chemical potentials.
    • While kinetics can be followed in detail, free energy transfer cannot be similarly dissected within a cycle.

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