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  • Title: Mapping the anatomy of a Plasmodium falciparum MSP-1 epitope using pseudopeptide-induced mono- and polyclonal antibodies and CD and NMR conformation analysis.
    Author: Lozano JM, Espejo F, Ocampo M, Salazar LM, Tovar D, Barrera N, Guzmán F, Patarroyo ME.
    Journal: J Struct Biol; 2004 Oct; 148(1):110-22. PubMed ID: 15363791.
    Abstract:
    Antigen structure modulation represents an approach towards designing subunit malaria vaccines. A specific epitope's alpha carbon stereochemistry, as well as its backbone topochemistry, was assessed for obtaining novel malarial immunogens. A variety of MSP-1(38-61) Plasmodium falciparum epitope pseudopeptides derived were synthesised, based on solid-phase pseudopeptide chemistry strategies; these included all-L, all-D, partially-D substituted, all-Psi-[NH-CO]-Retro, all-Psi-[NH-CO]-Retro-inverso, and Psi-[CH2NH] reduced amide surrogates. We demonstrate that specific recombinant MSP-1(34-469) fragment binding to red blood cells (RBCs) is specifically inhibited by non-modified MSP-1(42-61), as well as by its V52-L53, M51-V52 reduced amide surrogates and partial-D substitutions in K48 and E49. In vivo tests revealed that reduced amide pseudopeptide-immunised Aotus monkeys induced neutralising antibodies specifically recognising the MSP-1 N-terminus region. These findings support the role of molecular conformation in malaria vaccine development.
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