Malaria plasmodium antigen polypeptide se36, method of...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/30 (2006.01) A61K 39/015 (2006.01) A61P 33/06 (2006.01) C07K 1/34 (2006.01) C07K 14/445 (2006.01) C12P 21/02 (2006.01) G01N 33/569 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2404429

The present invention provides a polypeptide SE36 derived from the N-terminal domain (47 kd) of SERA (serine-repeat antigen) produced by malaria parasite, Plasonodium falciparum, at the erythrocyte stage, a process for purifying said polypeptide, and a malaria vaccine and diagnostic agent using as an active component said purified antigen obtained therefrom. SE36 can be produced in Escherichia coli on a large scale by deleting all or part of polymerized serines of the 47 kd serine-repeat region, whereby high purification is permitted. The human IgG3 antibodies specifically binding to SE36 prevents highly effectively growth of the protozoa in the red blood cells to inhibit fever and cerebral malaria, and further prevent the death.

L'invention concerne un polypeptide SE36 provenant du domaine N-terminal (47 kd) de l'antigène de répétition de sérine (SERA) produit par un hématozoaire falciparum en phase intraérythrocytaire; un procédé de purification dudit polypeptide; ainsi qu'un vaccin et une méthode diagnostique pour la malaria, contenant comme ingrédient actif l'antigène purifié ainsi obtenu. Par élimination de l'intégralité de la sérine polymérisée, ou d'une partie de celle-ci, du domaine de répétition de sérine 47 kd, une grande quantité de SE36 est produite par Escherichia coli et peut être purifiée dans une large mesure. Un anticorps IgG3 humain se fixant de manière spécifique au SE36 prévient de manière extrêmement efficace la prolifération du parasite dans les érythrocytes et inhibe par conséquent la fièvre et la malaria cérébrale, empêchant ainsi la mort.

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