title: Identification of B cell epitopes of a 30 kDa Babesia equi merozoite surface protein.
abstract: A 30 kDa immunodominant surface antigen (p30) of Babesia equi has been used as a diagnostic antigen. The B cell epitopes on this molecule recognized by horse sera and monoclonal antibody (MAb) against p30, 36/133.97, were determined. A synthetic peptide of p30 with amino acid sequence of 123FYQEVLFKGFEAV135 exhibited strong positive reaction with the infected horse sera. In contrast, MAb 36/133.97 recognized different region of p30, as peptide synthesized with amino acid sequence of 27ASGAVVDFQLESI39 reacted strongly. In competitive inhibition ELISA, the binding of MAb 36/133.97 to recombinant p30 was inhibited by horse antibodies, although they did not recognize same or an overlapping epitope. The data on B cell epitopes in this study may be important in improving serodiagnostic methods of B. equi infection.
authors.affiliation: Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hanafusa
authors.forename: T
authors.initials: T
authors.lastname: Sudo
authors.forename: Y
authors.initials: Y
authors.lastname: Sako
authors.forename: T
authors.initials: T
authors.lastname: Kanemaru
authors.forename: M
authors.initials: M
authors.lastname: Kamada
authors.forename: E
authors.initials: E
authors.lastname: Zweygarth
authors.forename: C
authors.initials: C
authors.lastname: Sugimoto
authors.forename: M
authors.initials: M
authors.lastname: Onuma
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D000953:Antigens, Protozoan / Q000276:immunology*; D000954:Antigens, Surface / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology* / Q000469:parasitology; D001403:Babesia / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D018604:Epitope Mapping; D000939:Epitopes / Q000276:immunology; D006736:Horses; D008969:Molecular Sequence Data; D019151:Peptide Library; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D000911:Antibodies, Monoclonal; D000953:Antigens, Protozoan; D000954:Antigens, Surface; D000939:Epitopes; D019151:Peptide Library