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The structural link between polymerization and sickle cell disease

R Mirchev1, F A Ferrone

  • 1Department of Physics and Atmospheric Science, Drexel University, Philadelphia, PA 19104, USA.

Journal of Molecular Biology
|February 7, 1997
PubMed
Summary
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Sickle hemoglobin polymers form through specific surface contacts, explaining rapid gelation and cross-linking in sickle cell disease. These interactions are key to disease severity.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Hematology

Background:

  • Sickle hemoglobin (HbS) molecules polymerize into complex structures.
  • Intermolecular contacts within HbS polymers are crucial for disease pathogenesis.

Purpose of the Study:

  • To elucidate the structural basis of sickle hemoglobin polymer formation and gelation kinetics.
  • To identify surface contact sites on HbS polymers and their role in disease.

Main Methods:

  • Analysis of sickle hemoglobin polymer structure.
  • Identification of intermolecular contact sites at the polymer surface.
  • Comparison of contact geometry within and between polymers.

Main Results:

  • Identical contact geometry exists within double strands and at the polymer surface.

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  • Surface contacts involve four of ten exterior molecules per layer.
  • This structural feature explains the exponential growth rate of HbS polymers during gelation.

    • Conclusions:

    • The identified surface contacts provide a structural rationale for rapid sickle hemoglobin polymer growth and gel cross-linking.
    • These contacts are critical determinants of sickle cell disease severity.