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. 1992 Nov;60(11):4640–4647. doi: 10.1128/iai.60.11.4640-4647.1992

Identification of T- and B-cell epitopes of the S2 and S3 subunits of pertussis toxin by use of synthetic peptides.

P Chong 1, G Zobrist 1, C Sia 1, S Loosmore 1, M Klein 1
PMCID: PMC258213  PMID: 1383153

Abstract

To design an optimized synthetic vaccine against whooping cough, we have studied the biological and immunological properties of three peptides of the S2 subunit and nine overlapping synthetic peptides covering the entire sequence of the S3 subunit of pertussis toxin (PT). Synthetic peptides corresponding to sequences 18 to 41, 78 to 108, 134 to 154, and 149 to 176 of S3 were found to be consistently capable of stimulating the proliferation of PT-specific T-cell lines primed with pertussis toxoid in both BALB/c and A/J strains of mice. All synthetic peptides were recognized by rabbit antisera raised against PT or pertussis toxoid. Both S2 and S3 peptide-keyhole limpet hemocyanin (KLH) conjugates in the presence of complete Freund's adjuvant induced peptide-specific antibody responses in rabbits, and the antisera raised against S2(1-23), S3(18-41), S3(37-64), and S3(149-176) peptide-KLH conjugates cross-reacted with both subunits in the immunoblots. All antisera except those against S2(123-154) and S3(103-127) reacted with native PT in an enzyme-linked immunosorbent assay (ELISA) with PT directly coated onto microtiter wells. In contrast, antisera raised against S2(123-154), S3(1-23), S3(18-41), S3(37-64), S3(60-87), and S3(103-127) peptide-KLH conjugates recognized native PT in a fetuin-PT capture ELISA. S2(78-98), S3(1-23), and S3(149-176) peptide-KLH conjugates elicited good PT-neutralizing antibody responses as judged by the antitoxin CHO cell assay. Identification of these B-cell neutralization epitopes and T-cell immunodominant determinants represents a first step towards the rational design of a synthetic vaccine against whooping cough.

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Selected References

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