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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Soluble and glyco-lipid modified baculovirus Plasmodium falciparum C-terminal merozoite surface protein 1, two forms of a leading malaria vaccine candidate.

Recombinant homologues of the Plasmodium merozoite surface protein 1 C-terminus are leading blood stage malaria vaccine candidates. MSP1 is anchored to the merozoite plasma membrane in vivo by a glycosyl-phosphatidyl-inositol (GPI) moiety, implicated in malaria pathology. Two types of recombinant Plasmodium falciparum MSP1p19 (PfMSP1p19) expressed in baculovirus/insect cells are described here: (1) a soluble, secreted form (PfMSP1p19S) and (2) detergent soluble cellular form(s) (PfMSP1p19+A), released from the infected cell surface by treatment with GPI specific phosphatidyl-inositol phospholipase C (PI-PLC). Soluble and cellular PfMSP1p19 were purified and characterized using SDS-PAGE, mass spectrometry (MS), N-terminal amino acid sequencing, gel filtration and glycan analyses. Quantitative inositol dosage suggested that surface GPI processed entities constituted only 14% of the purified cellular PfMSP1p19+A, with GPI unprocessed forms likely recovered in the endoplasmic reticulum. Nevertheless, this preparation has dramatic immuno-stimulatory activity to be described elsewhere. The interest of these results for both malaria specific and generic vaccine development are discussed.[1]


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