Hybrid molecules between heat-labile enterotoxin and cholera...

C - Chemistry – Metallurgy – 12 – N

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Details

C12N 15/62 (2006.01) A61K 39/106 (2006.01) A61K 39/108 (2006.01) A61K 39/116 (2006.01) C07K 14/245 (2006.01) C07K 14/28 (2006.01) C07K 19/00 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2219943

Hybrid molecules between heat-labile enterotoxin B subunit (LTB) and cholera toxin B subunit (CTB) are disclosed. Such a hybrid molecule comprises an amino-acid sequence which is composed of the amino-acid sequence of mature CTB in which such amino-acid residues are substituted with the corresponding amino-acid residues of mature LTB which impart LTB-specific epitope characteristics to said immunogenic mature CTB, or vice versa. In addition, a structural gene coding for such a hybrid molecule, a plasmid containing such a structural gene, and an immunogenic protein comprising such a hybrid molecule and optionally an immunoreactive amino-acid sequence of a prokaryotic or eukaryotic cell or a virus, are disclosed. Disclosed is also a vaccine, e.g. against enterotoxin-induced illness, comprising such an immunogenic protein, and a method of preventing or treating enterotoxin-induced illness in an individual.

Divulgation de molécules hybrides entre la sous-unité d'entérotoxine B thermolabile (TBL) et la sous-unité de toxine B du choléra (TBC). Une telle molécule hybride comprend une séquence d'acides aminés composée de la séquence d'acides aminés de TBC mature dans laquelle de tels résidus d'acides aminés sont substitués par les résidus correspondants d'acides aminés de TBL mature, ce qui confère des caractéristiques épitopiques spécifiques de TBL à ladite TBC mature immunogène, ou vice versa. Divulgation également d'un gène structurel codant une telle molécule hybride, d'un plasmide contenant un tel gène structurel et d'une protéine immunogène comprenant une telle molécule hybride et, éventuellement, une séquence immunoréactive d'acides aminés d'une cellule procaryote ou eucaryote ou d'un virus. Divulgation aussi d'un vaccin, p. ex. contre une maladie provoquée par une entérotoxine, comprenant une telle protéine immunogène, ainsi que d'une méthode de prévention ou de traitement d'une maladie provoquée par une entérotoxine chez un individu.

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