Description
Protectin, a complement regulatory protein, also known as CD59, or MIRL (membrane inhibitor of reactive lysis) is a small protein that inhibits the complement membrane attack complex by binding C5b678 and preventing C9 from binding and polymerizing. The amino-terminal 25 amino acids represented a typical signal peptide sequence and the carboxy-terminal hydrophobic amino acids were characteristic for phosphatidylinositol-anchored proteins. It was found that the CD59/Protectin antigen is a small protein sometimes associated with larger components (45 and 80 kD) in urine. CD59/Protectin antigen was released from the surface of transfected COS cells by phosphatidylinositol-specific phospholipase C, demonstrating that it is attached to the cell membrane by means of a glycolipid anchor; it is therefore likely to be absent from the surface of affected erythrocytes in the disease paroxysmal nocturnal hemoglobinuria.
Target
CD59a
Target Alias Names
AA987121, Cd59, protectin, RP24-297H17.1
Isotype/Mimetic
Rabbit IgG
Animal-Derived Biomaterials Used
Yes
Sequence Available
No
Original Discovery Method
Phage display technology
Antibody/Binder Origins
Animal-dependent discovery, post-2020, In vitro recombinant expression, Animal-derived biomaterials used in production or final formulation