Regulation of membrane-cytoskeletal interactions by tyrosine phosphorylation of erythrocyte band 3
E Ferru, K Giger, A Pantaleo… - Blood, The Journal …, 2011 - ashpublications.org
Blood, The Journal of the American Society of Hematology, 2011•ashpublications.org
The cytoplasmic domain of band 3 serves as a center of erythrocyte membrane organization
and constitutes the major substrate of erythrocyte tyrosine kinases. Tyrosine phosphorylation
of band 3 is induced by several physiologic stimuli, including malaria parasite invasion, cell
shrinkage, normal cell aging, and oxidant stress (thalassemias, sickle cell disease, glucose-
6-phosphate dehydrogenase deficiency, etc). In an effort to characterize the biologic
sequelae of band 3 tyrosine phosphorylation, we looked for changes in the polypeptide's …
and constitutes the major substrate of erythrocyte tyrosine kinases. Tyrosine phosphorylation
of band 3 is induced by several physiologic stimuli, including malaria parasite invasion, cell
shrinkage, normal cell aging, and oxidant stress (thalassemias, sickle cell disease, glucose-
6-phosphate dehydrogenase deficiency, etc). In an effort to characterize the biologic
sequelae of band 3 tyrosine phosphorylation, we looked for changes in the polypeptide's …
Abstract
The cytoplasmic domain of band 3 serves as a center of erythrocyte membrane organization and constitutes the major substrate of erythrocyte tyrosine kinases. Tyrosine phosphorylation of band 3 is induced by several physiologic stimuli, including malaria parasite invasion, cell shrinkage, normal cell aging, and oxidant stress (thalassemias, sickle cell disease, glucose-6-phosphate dehydrogenase deficiency, etc). In an effort to characterize the biologic sequelae of band 3 tyrosine phosphorylation, we looked for changes in the polypeptide's function that accompany its phosphorylation. We report that tyrosine phosphorylation promotes dissociation of band 3 from the spectrin-actin skeleton as evidenced by: (1) a decrease in ankyrin affinity in direct binding studies, (2) an increase in detergent extractability of band 3 from ghosts, (3) a rise in band 3 cross-linkability by bis-sulfosuccinimidyl-suberate, (4) significant changes in erythrocyte morphology, and (5) elevation of the rate of band 3 diffusion in intact cells. Because release of band 3 from its ankyrin and adducin linkages to the cytoskeleton can facilitate changes in multiple membrane properties, tyrosine phosphorylation of band 3 is argued to enable adaptive changes in erythrocyte biology that permit the cell to respond to the above stresses.
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