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. 1991 Jul;59(7):2297–2304. doi: 10.1128/iai.59.7.2297-2304.1991

Purification and immunogenicity of genetically obtained pneumolysin toxoids and their conjugation to Streptococcus pneumoniae type 19F polysaccharide.

J C Paton 1, R A Lock 1, C J Lee 1, J P Li 1, A M Berry 1, T J Mitchell 1, P W Andrew 1, D Hansman 1, G J Boulnois 1
PMCID: PMC258010  PMID: 2050399

Abstract

As part of an ongoing study concerned with improving human vaccines against Streptococcus pneumoniae, the genes for two defined pneumolysin (PL) toxoids (pneumolysoids), Pd-A (PL with a Cys----Gly substitution at amino acid 428) and Pd-B (PL with a Trp----Phe substitution at position 433), were inserted into the high-expression vector pKK233-2 in Escherichia coli and the pneumolysoids were purified. Groups of mice which had been immunized with either Pd-A, Pd-B, or native PL purified from S. pneumoniae were then challenged either intranasally or intraperitoneally with virulent pneumococci. Mice in all immunized groups survived significantly longer than sham-immunized controls. Both pneumolysoids were more effective than PL as protective immunogens. Pneumolysoid Pd-B was conjugated covalently with pneumococcal type 19F capsular polysaccharide (19F PS), and the immunogenicities of both the protein and the PS moieties of the conjugate in mice were determined. Significant anti-PL titers were obtained, and the immunogenicity of the 19F PS moiety was markedly enhanced compared with that of unconjugated PS. Conjugation also appears to have converted the 19F PS into an antigen capable of inducing a booster effect. These results support the notion that the efficacy of human, PS-based antipneumococcal vaccines might be improved by supplementation with pneumolysoid in the form of a covalent pneumolysoid-PS conjugate.

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Selected References

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