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Epitope mapping of preS2 of the hepatitis B virus surface antigen against a conformation‐dependent monoclonal antibody using synthetic peptides
Author(s) -
Lee Myung Kyu,
Kim Kil Lyong,
Hahm KyungSoo
Publication year - 1996
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216549600201713
Subject(s) - epitope , antigenicity , monoclonal antibody , polyclonal antibodies , microbiology and biotechnology , conformational epitope , peptide , chemistry , hbsag , virology , antigen , antiserum , peptide sequence , linear epitope , epitope mapping , antibody , biology , virus , hepatitis b virus , biochemistry , immunology , gene
Previously we reported that the N‐terminal sequence 120/123‐129 of the preS2 region of the hepatitis B virus surface antigen plays an important role on peptide antigenicity against a monoclonal antibody H8 (H8 mAb) by affecting the B cell epitope conformation of a peptide existing within the sequence 130‐145 (Lee et al., Biochem. Mol. Biol. Int., 34, 159‐168, 1994). In this study, we try to map the H8 mAb binding site using a series of substituted peptides in the sequence 131‐143 by competitive ELISA. Peptide antigenicities were greatly reduced when the residues 131 (L), 137 (R), 140 (Y), 141 (F) and 142 (P) were substituted. The residues 133 (D), 134 (P) and 136 (V) had a slight affect on the mAb binding, whereas the residues 135 (R) and 139 (L) had no effects on the mAb binding. In contrast to H8 mAb, however, three anti‐HBsAg polyclonal antisera showed the lowest bindings to the peptide substituted at position 135. These results suggest that the epitope against H8 mAb is discontinuously conformational.