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Ligand-induced conformational changes in proteins.

T A Steitz, R Harrison, I T Weber

    Ciba Foundation Symposium
    |January 1, 1983
    PubMed
    Summary
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    Ligand binding induces protein conformational changes, influencing function. This flexibility is crucial for enzymes like hexokinase and gene regulators like E. coli catabolite activator protein.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Proteins exist in multiple conformational states.
    • Ligand binding can alter the equilibrium distribution of these states.
    • Conformational changes are vital for protein function.

    Purpose of the Study:

    • To describe the nature and roles of ligand-induced conformational changes.
    • To explain how ligands influence protein structure equilibrium.
    • To highlight the functional significance of protein flexibility.

    Main Methods:

    • Analysis of protein conformational dynamics.
    • Description of ligand-protein interactions.
    • Case studies of hexokinase and gene regulatory proteins.

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    Main Results:

    • Ligand binding often causes domain closure via hinge-like motion.
    • This motion optimizes active sites (e.g., hexokinase for ATP binding).
    • Protein flexibility aids DNA diffusion and sequence recognition in gene regulators.

    Conclusions:

    • Ligand-induced conformational changes are fundamental to protein function.
    • Protein flexibility plays a dual role in gene regulatory proteins: diffusion and specific binding.
    • Understanding these changes is key to protein mechanism and drug design.