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Related Experiment Videos

Triple-point behavior of human haemoglobin.

S J Gill, B Richey

    Nature
    |July 12, 1984
    PubMed
    Summary

    Researchers explain the discovery of half-oxygenated hemoglobin crystals. This specific ligation likely arises from coexisting crystalline phases at a triple point, not a unique hemoglobin molecule.

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    Determination of the carbon monoxide binding constants of myoglobin mutants: comparison of kinetic and equilibrium methods.

    Biochemistry·1994

    Area of Science:

    • Biophysics
    • Crystallography
    • Biochemistry

    Background:

    • Crystallographic studies revealed half-oxygenated hemoglobin crystals.
    • This observation initially suggested a unique hemoglobin molecule with exactly two bound oxygens.
    • Hemoglobin's ligand-binding properties are crucial for understanding its physiological function.

    Purpose of the Study:

    • To explain the formation of specifically ligated hemoglobin crystals.
    • To investigate the coexistence of distinct crystalline phases in hemoglobin.
    • To elucidate the conditions leading to the observed half-oxygenation.

    Main Methods:

    • Thermodynamic analysis of hemoglobin-ligand equilibria.
    • Crystallographic phase analysis.
    • Modeling of solid and liquid phase interactions.

    Main Results:

    • The formation of crystals with specific ligation degrees is predicted at a triple point where two distinct crystalline phases coexist.
    • The studied crystals were likely selected from a mixture of T and R crystalline forms under triple point conditions.
    • Each crystalline phase exhibits unique oxygen-binding properties.

    Conclusions:

    • The observed half-oxygenated hemoglobin crystals can be explained by the coexistence of two distinct crystalline phases at a triple point.
    • A specific oxygen partial pressure defines the triple point where both solid phases coexist.
    • The degree of oxygen saturation in each solid phase is uniquely determined at the triple point.

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