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Interactions of five mouse mAb (10A4, 5F2, 9A7, 9G4 and 3H8) and sunflower profilin were characterized using synthetic overlapping peptides. All the continuous B cell epitopes analyzed in this work were 6-10 amino acids in length, and clustered at the N- and C-terminal alpha-helices and a two-stranded segment composed of residues 40-50. Mutational analysis of the epitopes revealed that single amino acid changes within these peptides had dramatic effects on IgG-binding characteristics. A three-dimensional molecular model of sunflower profilin was generated by homology modeling based on the crystal structure of Arabidopsis thaliana profilin. All but one of the murine B cell epitopes defined in this work were located on the surface of the profilin molecule in the alpha-helices (10A4 and 3H8) or in the turns (5F2 and 9G4). In contrast, 9A7 epitope was located in the profilin core and partially buried by the C-terminal. Two mAb (5F2 and 10A4) inhibited the binding of anti-profilin human IgE up to 52%. In contrast, mAb 3H8 seemed to enhance the binding of anti-profilin IgE of sera from allergic patients.

Type

Journal article

Journal

Int Immunol

Publication Date

09/2002

Volume

14

Pages

993 - 1001

Keywords

Allergens, Amino Acid Sequence, Animals, Antibodies, Monoclonal, Arabidopsis Proteins, B-Lymphocytes, Contractile Proteins, Epitope Mapping, Epitopes, B-Lymphocyte, Humans, Immunoglobulin E, Immunoglobulin G, Mice, Microfilament Proteins, Molecular Sequence Data, Plant Proteins, Profilins, Sequence Alignment