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Characterization of a Plasmodium falciparum epitope recognized by a monoclonal antibody with broad isolate and species specificity.

Monoclonal antibody (MAb) 7H8 raised against Plasmodium yoelii reacted with a series of proteins from P. falciparum that range in molecular weight from 46 to 194 kDa. By immunofluorescence assay, this MAb reacted with all isolates of P. falciparum tested. MAb 7H8 was used to screen a genomic expression library of asexual blood stage antigens of P. falciparum, Malayan Camp K+ and 7 independent clones were identified. These 7 clones were sequenced and the epitope recognized by MAb 7H8 in the recombinant protein of one of these clones was mapped. This epitope contained Lys Tyr Pro as core amino acids. However, similar sequences were not found in the other clones, indicating that this MAb binds to a structural epitope formed by different amino acids. The variable composition of the epitope may account for the number of P. falciparum malarial proteins recognized by MAb 7H8.