title: Epitope mapping of histone 5 (H5) with systemic lupus erythematosus, procainamide-induced lupus and hydralazine-induced lupus sera.
abstract: To define the linear epitopes on H5 that react with systemic lupus erythematosus (SLE) and drug-induced lupus (DIL) sera, concurrent overlapping hexameric peptides corresponding to the sequence of H5 were synthesized by stepwise elongation of the polypeptide chains on polyethylene supports. The hexapeptides were tested for reactivity with 8 SLE and 8 DIL sera using an enzyme linked immunosorbent assay (ELISA). SLE and hydralazine-induced lupus (HIL) antibodies were most reactive with peptide 45 (SSRQSI) and patients with procainamide-induced lupus (PIL) were most reactive with peptide 24 (SHPTYS). The epitopes of highest reactivity were in the globular domain of H5. Low reactivity was observed with carboxyl terminal peptides. These findings differ from immunoblotting studies of protease cleaved peptides which have previously shown that the H5 determinants are in the carboxyl terminus.
authors.affiliation: Joint Injury and Arthritis Research Group, Faculty of Medicine, University of Medicine, University of Calgary, Alberta, Canada.
authors.forename: J D
authors.initials: JD
authors.lastname: Pauls
authors.forename: S M
authors.initials: SM
authors.lastname: Edworthy
authors.forename: M J
authors.initials: MJ
authors.lastname: Fritzler
mesh_terms: D000595:Amino Acid Sequence; D000918:Antibody Specificity; D001323:Autoantibodies / Q000276:immunology*; D015153:Blotting, Western; D000939:Epitopes; D006657:Histones / Q000276:immunology*; D006801:Humans; D006830:Hydralazine / Q000494:pharmacology; D008180:Lupus Erythematosus, Systemic / Q000139:chemically induced / Q000276:immunology*; D008969:Molecular Sequence Data; D011342:Procainamide / Q000494:pharmacology; D011487:Protein Conformation
chemical_list: D001323:Autoantibodies; D000939:Epitopes; D006657:Histones; D006830:Hydralazine; D011342:Procainamide