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Erythrocyte bisulfite transport
R J Labotka1, W Galanter, V M Misiewicz
1Department of Pediatrics, College of Medicine, University of Illinois, Chicago.
Biochimica Et Biophysica Acta
|June 6, 1989
Summary
Human erythrocyte Band 3 protein shows high selectivity for bicarbonate. Bisulfite transport is 100-fold faster than sulfate transport, indicating Band 3
Area of Science:
- * Biochemistry and Molecular Biology
- * Cellular Physiology
- * Membrane Transport
Background:
- * The human erythrocyte anion transport protein, Band 3, is known to transport various anions.
- * Its selectivity for anions similar to bicarbonate is hypothesized but not fully elucidated.
Purpose of the Study:
- * To investigate the anion selectivity of the Band 3 protein.
- * To compare the transport rates of bisulfite, chloride, sulfate, and bicarbonate across the erythrocyte membrane.
Main Methods:
- * Colloid osmotic lysis technique in isotonic ammonium salt solution.
- * Measurement of lysis times under various conditions (e.g., presence of bicarbonate, acetazolamide, SITS).
- * Comparison of anion influx rates based on induced lysis times.
Main Results:
- * Bicarbonate significantly accelerated lysis induced by chloride, indicating anion transport.
- * Bisulfite influx via anion exchange was at least 100-fold faster than sulfate influx.
- * Bicarbonate primarily utilizes diffusion, while bisulfite uses both diffusion and anion transport.
Conclusions:
- * Band 3 protein exhibits significant selectivity for anions, with bisulfite showing a much higher transport rate than sulfate.
- * Bicarbonate transport is mainly through diffusion, whereas bisulfite transport involves both diffusion and the anion exchange pathway.
- * These findings contribute to understanding the functional specificity of the Band 3 protein.