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Conserved group-specific epitopes of the circumsporozoite proteins revealed by antibodies to synthetic peptides

Vergara, U.; Ruiz, A.; Ferreira, A.; Nussenzweig, R.S.; Nussenzweig, V.

Journal of Immunology 134(5): 3445-3448

1985

ISSN/ISBN: 0022-1767
PMID: 2580025
Document Number: 257807
The immunogenic properties of sporozoites are associated mainly with the circumsporozoite (CS) protein that covers the surface of mature sporozoites. This stage-specific protein has an immunodominant region with repetitive epitopes. Rabbits that are repeatedly immunized with sporozoites of Plasmodium knowlesi, a monkey malaria parasite, also recognize two synthetic peptides (N2 and C2) representing other polar domains of the CS protein. We show in this report that antibodies to the N2 and C2 synthetic peptides react not only with P. knowlesi but also with conserved regions of the surface membrane of other human, monkey, and rodent (but not avian) malaria sporozoites. Moreover, antibodies to N2 partially neutralize the infectivity of sporozoites of P. berghei, a rodent malaria parasite. In contrast, antibodies to synthetic peptides representing the repetitive epitope of P. knowlesi were strictly species specific.

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