Surface-exposed lysine residues on red blood cell membrane proteins

Surface-exposed lysine residues on red blood cell (RBC) membrane proteins serve as critical chemical handles for the covalent attachment of therapeutic agents, imaging probes, and polymers (Muzykantov, 2010). These residues, primarily found on abundant proteins such as Glycophorin A and Band 3, possess primary amine groups that are highly reactive toward electrophilic functional groups like N-hydroxysuccinimide (NHS) esters (Villa et al., 2016). By utilizing these sites, researchers can transform RBCs into long-circulating drug delivery vehicles, effectively shielding the cargo from immune clearance and reducing systemic toxicity (Magnani et al., 2002). This approach is particularly relevant in treating lysosomal storage diseases, chronic inflammatory conditions, and as a method for extending the half-life of proteins and small molecules (Hamidi et al., 2007). However, modification of these residues must be carefully controlled to avoid compromising the structural integrity or deformability of the RBC, which could lead to premature splenic sequestration or hemolysis (Koleva et al., 2002).

Other names

Erythrocyte surface aminesRBC membrane protein lysinesSurface-accessible lysines on erythrocytes

Covalent bioconjugation via nucleophilic attack of primary amines on electrophilic drug derivatives