title: Epitope regions in the heavy chain of Clostridium botulinum type E neurotoxin recognized by monoclonal antibodies.
abstract: Seventeen monoclonal antibodies (MAbs) were previously established against the heavy chain (Hc) of botulinum type E neurotoxin in BALB/c mice immunized with the type E toxoid. Five MAbs (LE15-5, LE34-6, EK19-7, EK21-4, and AE27-9) showed toxin-neutralizing activity in mice. Two of the five MAbs, EK19-7 and EK21-4, recognized the regions located at amino acid positions 731 to 787 and 811 to 897, respectively. One of the remaining three antibodies (LE34-6) reacted with the amino acid sequence VIKAIN, at amino acid positions 663 to 668, closed by the ion channel-forming domain. It is suggested that the ion channel-forming domain may also be associated with the blocking of acetylcholine release. Furthermore, the amino acid sequence YLTHMRD within 30 residues of the C-terminal region of the Hc component seemed to be recognized by LE15-5. It has been reported that the binding domain of the type E toxin is located on the C-terminal half of the Hc component. Therefore, the neutralizing activity of LE15-5 antibody may be attributed to its ability to block the binding of neurotoxin to the receptor of target cells.
authors.affiliation: Department of Microbiology, Sapporo Medical University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kubota
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: N
authors.initials: N
authors.lastname: Yokosawa
authors.forename: K
authors.initials: K
authors.lastname: Tsuzuki
authors.forename: T
authors.initials: T
authors.lastname: Indoh
authors.forename: K
authors.initials: K
authors.lastname: Moriishi
authors.forename: K
authors.initials: K
authors.lastname: Sanda
authors.forename: Y
authors.initials: Y
authors.lastname: Maki
authors.forename: K
authors.initials: K
authors.lastname: Inoue
authors.forename: N
authors.initials: N
authors.lastname: Fujii
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000907:Antibodies, Bacterial / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D001905:Botulinum Toxins / Q000235:genetics / Q000276:immunology*; D003014:Clostridium botulinum / Q000235:genetics / Q000276:immunology*; D018604:Epitope Mapping; D000939:Epitopes / Q000235:genetics* / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data
chemical_list: D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D000939:Epitopes; D001905:Botulinum Toxins; C096326:botulinum toxin type E