Identification of the Rheumatoid Arthritis Shared Epitope Binding Site on Calreticulin

Abstract excerpt

BACKGROUND: The rheumatoid arthritis (RA) shared epitope (SE), a major risk factor for severe disease, is a five amino acid motif in the third allelic hypervariable region of the HLA-DRbeta chain. The molecular mechanisms by which the SE affects susceptibility to--and severity of--RA are unknown. We have recently demonstrated that the SE acts as a ligand that interacts with cell surface calreticulin (CRT) and...

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