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Related Experiment Videos

Nitric oxide induced conformational changes in opossum hemoglobin.

M E John, M R Waterman

    The Journal of Biological Chemistry
    |December 10, 1979
    PubMed
    Summary

    Opossum hemoglobin shifts to a T structure with nitric oxide (NO) and shows lower oxygen affinity than human hemoglobin. This suggests structural differences may destabilize its R state, impacting oxygen transport.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Physiology

    Background:

    • Hemoglobin (Hb) structure and function are critical for oxygen transport.
    • Nitric oxide (NO) is a signaling molecule that interacts with Hb.
    • Comparative studies of Hb across species reveal evolutionary adaptations.

    Purpose of the Study:

    • To investigate the quaternary structure and oxygen binding properties of opossum hemoglobin.
    • To explore the effect of nitric oxide (NO) ligation on opossum hemoglobin.
    • To compare opossum hemoglobin's characteristics with human hemoglobin (HbA).

    Main Methods:

    • Spectroscopic analysis of opossum hemoglobin.
    • Oxygen equilibrium curves.
    • Nitric oxide (NO) ligation studies.
    • pH-dependent binding experiments.

    Main Results:

    • Opossum hemoglobin adopts a T quaternary structure upon NO ligation at pH 6.7.
    • Stripped opossum hemoglobin exhibits lower oxygen affinity compared to human hemoglobin.
    • pH-dependent heme-heme interaction was observed (n=2.14 at pH 7.0, n=2.46 at pH 7.35).
    • Structural differences, including the absence of a distal histidine in alpha-subunits, may destabilize the R quaternary structure.

    Conclusions:

    • Opossum hemoglobin's T-state transition upon NO ligation suggests a destabilized oxy (R) structure.
    • Reduced oxygen affinity might be compensated by physiological factors like phosphate effects.
    • Comparative analysis highlights unique adaptations in opossum hemoglobin's structure-function relationship.

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