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Related Experiment Videos

Sickle hemoglobin fibers: mechanisms of depolymerization.

Gunjan Agarwal1, Jiang Cheng Wang, Suzanna Kwong

  • 1Department of Physiology, Biophysics, Albert Einstein College of Medicine, Bronx, NY 10461-1975, USA.

Journal of Molecular Biology
|September 10, 2002
PubMed
Summary

Carbon monoxide (CO) influences hemoglobin S fiber depolymerization through distinct mechanisms at fiber ends and sides. Understanding these pathways is crucial for sickle cell disease research.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Sickle cell disease (SCD) is characterized by the polymerization of hemoglobin S (HbS) into fibers.
  • The depolymerization of these HbS fibers is a critical process influencing disease pathophysiology.
  • Carbon monoxide (CO) is known to interact with hemoglobin, potentially affecting HbS polymerization.

Purpose of the Study:

  • To investigate the mechanisms and kinetics of HbS fiber depolymerization in the presence of CO.
  • To differentiate between end-depolymerization and side-depolymerization pathways.
  • To elucidate the roles of ligand-dependent and ligand-independent mechanisms in CO-mediated depolymerization.

Main Methods:

  • Photolysis of carboxyhemoglobin S (COHbS) to generate and isolate individual HbS fibers.

Related Experiment Videos

  • Induction of depolymerization by removing photolysis.
  • Kinetic analysis and electron microscopy of depolymerizing fibers under varying CO partial pressures (pCO).

    • Main Results:

    • Depolymerization occurs at both fiber ends and sides, with distinct kinetics and mechanisms.
    • End-depolymerization is dominant at low pCO, proceeding at ~1 microm s⁻¹, primarily via a ligand-independent path.
    • Side-depolymerization is rapid (<1 second) at high pCO, dominated by a ligand-dependent path, potentially involving hole nucleation.

    Conclusions:

    • HbS fiber depolymerization is a complex process influenced by CO concentration and location (ends vs. sides).
    • Ligand-independent mechanisms are key for end-depolymerization, while ligand-dependent mechanisms dominate side-depolymerization, especially at high pCO.
    • A proposed model for side-depolymerization involves hole nucleation followed by rapid dissociation, offering insights into SCD pathophysiology.