Polymorphic Positions 349 and 725 of the Autoimmunity-Protective Allotype 10 of ER Aminopeptidase 1 Are Key in Determining Its Unique Enzymatic Properties

ER aminopeptidase 1 (ERAP1) is a polymorphic intracellular aminopeptidase with key roles in antigen presentation and adaptive immune responses. ERAP1 allotype 10 is highly protective toward developing some forms of autoimmunity and displays unusual functional properties, including very low activity versus some substrates. 

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