Abstract
Monoclonal antibody M26-32 has been shown to strongly inhibit the growth of Plasmodium falciparum in vitro. To identify the target antigen of M26-32, a P. falciparum Dd2 asexual stage cDNA expression library was screened with this antibody, and a full open reading frame cDNA was obtained. This gene, named pfmag-1, encodes a polypeptide of 589 amino acids. The protein PfMAg-1 was characterized as a membrane-associated protein that expressed on the surface of merozoite during erythrocytic stage. Remarkably, at the C terminus of PfMAg-1, there are 14 copies of a deca-peptide sequence of QTDEIKND (H/N) I. This tandem repeat domain was identified to harbor the epitope of the protective M26-32 monoclonal antibody, and was also recognized by sera of patients infected with P. falciparum. Rabbit antibody elicited against this deca-peptide repeat domain effectively inhibited P. falciparum invasion in vitro. Our work suggests that PfMAg-1 is a promising malaria vaccine candidate.
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Acknowledgments
We thank Professor Lina Wang for kindly providing anti-PfMSP-4 rabbit serum and recombinant protein PfMSP-119. We would also like to thank Professor QiJun Chen (Microbiology and Tumor Biology Center, Karolinska Institutet, the Swedish Institute for Infectious Disease Control, Sweden) for valuable advice to this work. This investigation was supported by grants from the National High Technology Research and Development Program (#102-07-04-02) and China Medical Board (CMB, New York, USA) (#98-674).
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Gao, YH., Li, HL., Lu, Y. et al. Identification of a vaccine candidate antigen, PfMAg-1, from Plasmodium falciparum with monoclonal antibody M26-32. Parasitol Res 105, 1723–1732 (2009). https://doi.org/10.1007/s00436-009-1617-4
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DOI: https://doi.org/10.1007/s00436-009-1617-4