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Title: Characterization of a monoclonal IgA rheumatoid factor. II. Evidence for reactivity with a specific IgG Fc fragment determinant. Author: Taylor H, Abraham GN. Journal: Clin Exp Immunol; 1973 Apr; 13(4):529-36. PubMed ID: 4123819. Abstract: Evidence is provided which supports the concept that a previously characterized monoclonal IgA-λ rheumatoid factor with a medium-binding avidity reacts with a select Fc region antigenic determinant. The interaction between this rheumatoid factor and anti-Rh-coated human erythrocytes is inhibited by IgG1 Fc fragment, IgG1 heavy chains, and a single peptide pool isolated from this tryptic digest by paper chromatography. Cyanogen bromide cleavage of the isolated heavy chains abolishes this reactivity. A methionine residue is assumed to be near, involved in, or necessary for reactivity between the IgA and its antigenic determinant. The data thus provide further evidence for a specific autoantigenic, rheumatoid factor-reactive determinant.[Abstract] [Full Text] [Related] [New Search]