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A clone encoding a recombinant protein which reacted strongly with human antibodies from a donor clinically immune to malaria, was isolated from a genomic Plasmodium falciparum library. Mice injected with this protein, designated 10b, produced antibodies which reacted with all developmental stages of erythrocytic asexual parasites in indirect immunofluorescence. In immunoblotting, the same antibodies recognized two P. falciparum polypeptides of 36 kDa and 33 kDa. Of three monoclonal antibodies raised against the 10b recombinant protein, two inhibited parasite reinvasion of erythrocytes in an isolate specific manner. Surprisingly, however, the third was found to significantly enhance reinvasion of erythrocytes and also to induce a more rapid maturation of intraerythrocytic parasites in all isolates tested. Nucleotide sequence analysis of the 1124 bp insert revealed that it encodes a protein which consists of 30% asparagine and contains three asparagine rich, imperfect tandem repeats: Lys-Lys-Asn-Asn (3x), Met-Asn-His/Gln-Pro-Asn-Asn (14x), and Lys-Asn-Asn-Asn-Asn (7x).
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P Perlmann, and
H Wigzell, and
U Pettersson
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July 2023,
Research square,
