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Acceleration of hemoglobin C crystallization by hemoglobin S
M J Lin1, R L Nagel, R E Hirsch
1Department of Medicine, Albert Einstein College of Medicine, Bronx, NY.
Blood
|October 1, 1989
Summary
Hemoglobin S (HbS) significantly accelerates the in vitro crystallization of Hemoglobin C (HbC). This cocrystallization mechanism, involving HbS incorporation into HbC crystals, is crucial for understanding Hemoglobin SC disease.
Area of Science:
- Hematology
- Molecular Biology
- Biophysics
Background:
- Circulating hemoglobin (Hb) CC erythrocytes contain oxygenated HbC crystals.
- Hemoglobin F (HbF) inhibits HbC crystallization in vitro.
- Previous research established HbF's inhibitory role.
Purpose of the Study:
- To investigate the effect of Hemoglobin S (HbS) on Hemoglobin C (HbC) crystallization.
- To elucidate the mechanism of HbS-induced acceleration of HbC crystallization.
- To explore the implications for understanding Hemoglobin SC disease.
Main Methods:
- In vitro crystallization assays using varying ratios of HbS and HbC in potassium phosphate buffer.
- Hemocytometer counting of crystals formed over time.
- Analysis of crystal and supernatant hemoglobin composition using citrate agar gel electrophoresis.
- Characterization of crystal morphology.
Main Results:
- HbS significantly accelerates HbC crystallization, with rapid incorporation of HbS into HbC crystals.
- Pure HbS forms needle-shaped crystals after two hours; pure HbC does not crystallize within 15 minutes.
- Mixtures of HbS and HbC showed dose-dependent crystallization acceleration, with HbS rapidly incorporated into tetragonal crystals.
- HbA or albumin diluted HbC crystallization, unlike HbS.
Conclusions:
- HbS accelerates HbC crystallization through a cocrystallization mechanism.
- HbS is rapidly incorporated into HbC crystals, influencing crystallization kinetics.
- These findings provide insights into the pathogenesis of Hemoglobin SC disease.