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Related Experiment Video

Updated: Jun 19, 2026

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry

Published on: November 5, 2019

Band 3 catalyzes sickle hemoglobin polymerization.

Maria A Rotter¹, Haiyan Chu, Philip S Low

¹Department of Physics, Drexel University, Philadelphia, PA 19104, United States.

Biophysical Chemistry

|November 3, 2009

Summary

A strong binding mutant of band 3 protein (cdb3) accelerates sickle hemoglobin (HbS) nucleation, while a weak mutant does not. This suggests cdb3 stabilizes HbS dimers, catalyzing HbS nucleation.

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Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics

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Published on: February 19, 2017

Area of Science:

Biophysics
Molecular Biology
Hematology

Background:

Sickle hemoglobin (HbS) polymerization causes sickle cell disease.
The cytoplasmic domain of band 3 (cdb3) is a membrane protein that binds HbS.
Understanding HbS nucleation is crucial for therapeutic development.

Purpose of the Study:

To investigate the effect of cdb3 mutants on HbS nucleation rates.
To elucidate the mechanism of HbS-cdb3 interaction during nucleation.
To explore the potential role of this interaction in intracellular processes.

Main Methods:

Measurement of homogeneous and heterogeneous nucleation rates of HbS.
Utilizing strongly and weakly binding deletion mutants of cdb3.
Analysis of HbS-cdb3 interactions using a proposed model.

Main Results:

A strongly binding cdb3 mutant accelerated HbS nucleation rates (both homogeneous and heterogeneous) by a factor of 2.
A weakly binding cdb3 mutant showed no impact on HbS nucleation rates.
The results support a model where strong cdb3 binding stabilizes HbS dimers, catalyzing nucleation.

Conclusions:

Strongly binding cdb3 acts as a catalyst for HbS nucleation by stabilizing HbS dimers.
Weakly binding cdb3 does not enhance nucleation, potentially due to single-molecule binding and inactivation.
The observed catalytic behavior of cdb3 may be relevant to intracellular HbS polymerization processes.