Mutant cholera holotoxin as an adjuvant

A - Human Necessities – 61 – K

Patent

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Details

A61K 39/39 (2006.01) A61K 39/095 (2006.01) A61K 39/102 (2006.01) A61K 39/106 (2006.01) A61K 39/15 (2006.01) A61K 39/155 (2006.01) A61K 39/245 (2006.01) C07K 14/28 (2006.01) C12N 5/10 (2006.01) C12N 15/63 (2006.01) A61K 39/00 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2344740

A mutant cholera holotoxin featuring a point mutation at amino acid 29 of the A subunit, wherein the glutamic acid residue is replaced by an amino acid other than aspartic acid, is useful as an adjuvant in an antigenic composition to enhance the immune response in a vertebrate host to a selected antigen from a pathogenic bacterium, virus, fungus or parasite. In a particular embodiment, the amino acid 29 is histidine. The mutant cholera holotoxin may contain at least one additional mutation in the A subunit at a position other than amino acid 29. The antigenic composition may include a second adjuvant in addition to the mutant cholera holotoxin.

L'invention concerne une holotoxine mutante du choléra comprenant un point de mutation au niveau de l'acide aminé 29 de la sous-unité A. Le résidu d'acide glutamique est substitué par un acide aminé autre que l'acide aspartique. Cette holotoxine mutante du choléra est utilisée comme adjuvant dans une composition antigénique afin d'améliorer, chez un vertébré, la réponse immunitaire à un antigène choisi issu d'une bactérie pathogène, d'un virus, d'un champignon ou d'un parasite. Dans un mode de réalisation, l'acide aminé 29 est l'histidine. Cette holotoxine mutante du choléra peut contenir au moins une mutation additionnelle dans la sous-unité A au niveau d'une position autre que l'acide aminé 29. Outre l'holotoxine mutante du choléra, cette composition antigénique peut comprendre un second adjuvant.

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