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Infect. Immun., Jul 1997, 2772-2777, Vol 65, No. 7
T Fraser, P Michon, JW Barnwell, AR Noe, F Al-Yaman, DC Kaslow and JH Adams
Plasmodium vivax Duffy binding protein (DBP) is a conserved functionally
important protein. P. vivax DBP is an asexual blood-stage malaria vaccine
candidate because adhesion of P. vivax DBP to its erythrocyte receptor is
essential for the parasite to continue development in human blood. We
developed a soluble recombinant protein of P. vivax DBP (rDBP) and examined
serologic activity to it in residents of a region of high endemicity. This
soluble rDBP product contained the cysteine-rich ligand domain and most of
the contiguous proline-rich hydrophilic region. rDBP was expressed as a
glutathione S- transferase (GST) fusion protein and was isolated from GST
by thrombin treatment of the purified fusion protein bound on glutathione
agarose beads. P. vivax rDBP was immunogenic in rabbits and induced
antibodies that reacted with P. vivax and Plasmodium knowlesi merozoites.
Human sera from adult residents of a region of Papua New Guinea where
malaria is highly endemic or P. vivax-infected North American residents
reacted with rDBP in an immunoblot and an enzyme-linked immunosorbent
assay. The reactivity to reduced, denatured P. vivax rDBP and the cross-
reactivity with P. knowlesi indicated the presence of immunogenic conserved
linear B-cell epitopes. A more extensive serologic survey of Papua New
Guinea residents showed that antibody response to P. vivax DBP is common
and increases with age, suggesting a possible boosting of the antibody
response in some by repeated exposure to P. vivax. A positive humoral
response to P. vivax DBP correlated with a significantly higher response to
P. vivax MSP-1(19). The natural immunogenicity of this DBP should
strengthen its usefulness as a vaccine.
Copyright © 1997, American Society for Microbiology
Expression and serologic activity of a soluble recombinant Plasmodium vivax Duffy binding protein
Department of Biological Sciences, University of Notre Dame, Indiana 46556, USA.
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