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Solvent viscosity and protein dynamics

D Beece, L Eisenstein, H Frauenfelder

    Biochemistry
    |November 11, 1980
    PubMed
    Summary
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    Protein dynamics are key to ligand movement. This study reveals ligand transitions within proteins are governed by conformational substates, not static barriers, influencing biochemical reactions.

    Area of Science:

    • Biophysics
    • Biochemistry
    • Physical Chemistry

    Background:

    • Proteins exist in dynamic conformational substates, enabling internal ligand movement.
    • Understanding protein-ligand interactions is crucial for biochemical processes.

    Purpose of the Study:

    • To investigate the role of protein conformational substates in ligand binding and motion.
    • To develop a novel method for analyzing protein dynamics beyond solvent effects.

    Main Methods:

    • Flash photolysis experiments studying carbon monoxide (CO) binding to protoheme and myoglobin (O2 and CO).
    • Analysis of ligand transition rates across various solvents, temperatures, and viscosities.
    • Application of a novel data evaluation approach considering all solvents simultaneously.

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    Main Results:

    • Ligand transition rates in heme-CO are inversely proportional to solvent viscosity, fitting the Kramers equation.
    • Myoglobin ligand (O2, CO) rates are viscosity-dependent, especially at low viscosities.
    • Protein reactions, even in aqueous solutions, are influenced by solvent viscosity.

    Conclusions:

    • Ligand motion within proteins is primarily controlled by dynamic conformational substates ('gates'), not static barriers.
    • The novel evaluation method provides more accurate protein barrier parameters than conventional approaches.
    • This dynamic model is essential for understanding and interpreting many biochemical reactions.