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. 1993 Mar;61(3):892–897. doi: 10.1128/iai.61.3.892-897.1993

Conservation of antigen components from two recombinant hybrid proteins protective against malaria.

B Knapp 1, U Nau 1, E Hundt 1
PMCID: PMC302816  PMID: 8432609

Abstract

Recently, we have shown that two hybrid proteins carrying partial sequences of the blood-stage antigens SERP, HRPII, and MSAI from Plasmodium falciparum confer protective immunity on Aotus monkeys against an experimental parasite infection (B. Knapp, E. Hundt, B. Enders, and H. A. Küpper, Infect. Immun. 60:2397-2401, 1992). The malarial components of the hybrid proteins consist of amino acid residues 630 to 892 of SERP, amino acid residues 146 to 260 of MSAI, and the 189 C-terminal residues of HRPII. We have studied the diversity of these protein regions in field isolates of P. falciparum. Genomic DNA was extracted from the blood of six donors from two different areas where malaria is endemic. The gene regions of SERP and MSAI coding for the corresponding sequences of the protective hybrid proteins and the exon II region of the HRPII gene were amplified by polymerase chain reaction and sequenced. All three regions were found to be highly conserved. In the 262-amino-acid fragment of SERP, one single conservative amino acid substitution was found. The exon II region of HRPII showed only a slight variability in number and arrangement of the repeat units. The 115-amino-acid fragment of MSAI which is located within an N-terminal region known to be conserved among different parasite strains was shown to be the most variable among the vaccine components: amino acid substitutions were found in 14 different positions of this MSAI region when both laboratory strains and field isolates were compared.

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Selected References

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