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Structure, dynamics, and reactivity in hemoglobin.

J M Friedman

    Science (New York, N.Y.)
    |June 14, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Researchers explored how hemoglobin protein structure influences oxygen binding. They found the iron-proximal histidine linkage is key to controlling ligand binding, impacting protein function.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Spectroscopy

    Background:

    • Hemoglobin's static structure and function are known, but energy storage and use within its structure remain unclear.
    • Understanding how protein quaternary structure influences the local environment near oxygen-binding sites is crucial.

    Purpose of the Study:

    • To investigate the coupling mechanism between hemoglobin's overall structure and its oxygen-binding sites.
    • To elucidate how protein structure controls ligand binding and functional diversity.

    Main Methods:

    • Time-resolved resonance Raman spectroscopy was used to probe vibrational dynamics.
    • Spectra from equilibrium and transient deoxy hemoglobins across species were compared.
    • Pulse-probe Raman experiments analyzed photodissociated, ligated hemoglobins.

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    Main Results:

    • Two distinct tertiary states exist for each quaternary structure, dependent on ligand binding.
    • Local tertiary structure relaxation occurs over nanoseconds to microseconds after photodissociation.
    • The iron-proximal histidine linkage systematically responds to protein structural changes.

    Conclusions:

    • A correlation between iron-proximal histidine stretching frequency and ligand reactivity parameters (e.g., geminate recombination) was observed.
    • This localized structural element is implicated in protein-mediated control of ligand binding.
    • A model for coarse and fine control of ligand binding by protein structure is proposed.