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Related Experiment Videos

Structural transitions upon ligand binding in a cooperative dimeric hemoglobin.

W E Royer1, W A Hendrickson, E Chiancone

  • 1Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032.

Science (New York, N.Y.)
|August 3, 1990
PubMed
Summary

Clam hemoglobin exhibits a unique cooperative oxygen binding mechanism, distinct from mammals. Structural analysis reveals direct heme communication across a novel interface, enabling potentiation of oxygen affinity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Science

Background:

  • Hemoglobin (Hb) is crucial for oxygen transport in vertebrates.
  • Mammalian hemoglobins display cooperative oxygen binding through quaternary structural changes.
  • The structural basis of cooperative oxygen binding in invertebrate hemoglobins remains less understood.

Purpose of the Study:

  • To elucidate the structural mechanisms underlying cooperative oxygen binding in dimeric clam hemoglobin.
  • To compare the structural dynamics of clam Hb with mammalian Hb upon ligand binding.

Main Methods:

  • Determined high-resolution (2.4 angstrom) crystal structures of dimeric clam hemoglobin.
  • Compared structures in both deoxygenated and carbon monoxide (CO)-liganded states.

Related Experiment Videos

  • Analyzed conformational changes at tertiary and quaternary structural levels.

    • Main Results:

    • Identified a novel subunit interface involving E and F helices facilitating direct heme-heme communication.
    • Observed significant tertiary structural changes at the interface upon ligand binding.
    • Conformational changes were more pronounced at the tertiary level but subtler at the quaternary level compared to mammalian Hb.

    Conclusions:

    • Clam hemoglobin employs a distinct structural mechanism for cooperative oxygen binding.
    • Direct communication between heme groups across the novel interface is key to its function.
    • This mechanism involves significant tertiary rearrangements, linking ligand binding in one subunit to enhanced affinity in the other.