Glycophorin (GP)

Red blood cell outer membrane sialic acid-rich glycoproteins, primarily known as glycophorins (A, B, C, and D), are essential sialoglycoproteins that span the erythrocyte membrane. They are characterized by a high content of sialic acid, which provides the red blood cell (RBC) with a strong negative surface charge (zeta potential), preventing spontaneous aggregation and adherence to vascular endothelium. Beyond their structural role in maintaining RBC shape and deformability through interactions with the cytoskeleton (e.g., Band 3 and Protein 4.1), these glycoproteins serve as the primary receptors for various pathogens. Most notably, Glycophorin A is the receptor for the Plasmodium falciparum erythrocyte-binding antigen 175 (EBA-175), a critical step in the invasion process of the malaria parasite. They also function as receptors for viruses such as Influenza and Hepatitis A. In clinical medicine, they are the basis for the MNS and Gerbich blood group systems, making them relevant in transfusion medicine and hemolytic diseases. Therapeutic strategies targeting these glycoproteins focus on blocking pathogen entry, particularly in malaria vaccine development and anti-adhesive therapies.

Other names

Red blood cell sialoglycoproteinSialoglycoproteinPAS-1PAS-2PAS-3MN sialoglycoproteinSs sialoglycoproteinCD235a (Glycophorin A)CD235b (Glycophorin B)CD236R (Glycophorin C)GYPAGYPBGYPC

Inhibition of pathogen-host cell attachment by blocking the interaction between parasite ligands (e.g., EBA-175) and glycophorin receptors; modulation of red blood cell surface charge to prevent cytoadherence and aggregation.