CD59 (Protectin) is a small (18-20 kDa) GPI-anchored ubiquitously expressed inhibitor of the membrane attack complex (MAC). It is thus the key regulator that preserves the autologous cells from terminal effector mechanism of the complement cascade. CD59 associates with C5b-8 complex and thereby counteracts appropriate formation of cytolytic pore within the plasma membrane. CD59 is also an low-affinity ligand of human CD2 and causes T cell costimulation.
16.3A5; 1F5; 1F5 antigen; 20 kDa homologous restriction factor; CD59; CD59 antigen p18-20 (antigen identified by monoclonal antibodies 16.3A5, EJ16, EJ30, EL32 and G344); CD59 glycoprotein; CD59 molecule complement regulatory protein; CD59 molecule, complement regulatory protein; EJ16; EJ30; EL32; G344; HRF-20; HRF20; human leukocyte antigen MIC11; Ly-6-like protein; lymphocytic antigen CD59/MEM43; MAC-inhibitory protein; MAC-IP; MACIF; MEM43; MEM43 antigen; membrane attack complex (MAC) inhibition factor; Membrane attack complex inhibition factor; Membrane inhibitor of reactive lysis; MIC11; MIN1; MIN2; MIN3; MIRL; MSK21; p18-20; Protectin; surface anitgen recognized by monoclonal antibody 16.3A5; T cell-activating protein
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