Loss of Rotational Mobility of Band 3 Proteins in Human Erythrocyte Membranes Induced by Antibodies to Glycophorin A
Overview
Authors
Affiliations
The effect of antibodies to glycophorin A on the rotational diffusion of band 3 in human erythrocyte membranes was investigated by transient dichrosim. Three antibodies that recognize different epitopes on the exofacial domain of glycophorin A all strongly reduce the rotational mobility of band 3. The effect is at most only weakly dependent on the distance of the epitope from the membrane surface. The degree of immobilization obtained with two of the antibodies, BRIC14 and R18, is very similar to that produced by antibodies to band 3 itself. Similar results were obtained with membranes stripped of skeletal proteins. Fab fragments and an antibody to glycophorin C had no effect on band 3 rotational mobility. These results rule out a mechanism whereby band 3 rotational immobilization results from enhanced interactions with the membrane skeleton that are mediated by a conformational change in glycophorin A. Rather, they strongly indicate that the antibodies to glycophorin A cross-link existing band 3-glycophorin A complexes that have lifetimes that are long compared with the millisecond time scale of the transient dichroism measurements.
Heteromeric Solute Carriers: Function, Structure, Pathology and Pharmacology.
Fairweather S, Shah N, Brer S Adv Exp Med Biol. 2020; 21:13-127.
PMID: 33052588 DOI: 10.1007/5584_2020_584.
Kalli A, Reithmeier R PLoS Comput Biol. 2018; 14(7):e1006284.
PMID: 30011272 PMC: 6080803. DOI: 10.1371/journal.pcbi.1006284.
Rivera-Santiago R, Harper S, Sriswasdi S, Hembach P, Speicher D Structure. 2016; 25(1):132-145.
PMID: 27989623 PMC: 5214978. DOI: 10.1016/j.str.2016.11.017.
Diffusion of glycophorin A in human erythrocytes.
Giger K, Habib I, Ritchie K, Low P Biochim Biophys Acta. 2016; 1858(11):2839-2845.
PMID: 27580023 PMC: 5045813. DOI: 10.1016/j.bbamem.2016.08.012.
Sharmin A, Salassa L, Rosenberg E, Ross J, Abbott G, Black L Inorg Chem. 2013; 52(19):10835-45.
PMID: 24063694 PMC: 3903323. DOI: 10.1021/ic400706u.