Non-toxic mutants of pathogenic gram-negative bacteria

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 1/20 (2006.01) A23K 1/16 (2006.01) A61K 39/02 (2006.01) A61K 39/095 (2006.01) A61K 39/102 (2006.01) A61K 39/104 (2006.01) A61K 39/112 (2006.01) A61K 39/116 (2006.01) A61K 39/385 (2006.01) A61K 39/40 (2006.01) C07K 16/12 (2006.01) C12N 1/36 (2006.01) C12N 9/10 (2006.01) C12N 15/01 (2006.01) G01N 33/569 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2238640

A method is provided for identifying, isolating, and producing htrB mutants of gram-negative bacterial pathogens. The method comprises mutating the htrB gene of a gram-negative bacterial pathogen so that there is a lack of a functional htrB protein, resulting in a mutant that lacks one or more secondary acyl chains contained in the wild type gram-negative bacterial pathogen, and displays substantially reduced toxicity as compared to the wild type strain. Also, the present invention provides methods for using a vaccine formulation containing the htrB mutant, the endotoxin isolated therefrom, or the endotoxin isolated therefrom which is then conjugated to a carrier protein, to immunize an individual against infections caused by gram-negative bacterial pathogens by administering a prophylactically effective amount of the vaccine formulation.

L'invention concerne un procédé servant à identifier, à isoler et à produire des mutants de htrB de bactéries pathogènes Gram-négatives. Ce procédé consiste à provoquer la mutation du gène de htrB d'une bactérie pathogène Gram-négative, de manière qu'un manque en protéine fonctionnelle de htrB, soit créé et que soit produit un mutant dénué d'une ou plusieurs chaînes d'acyle secondaire contenues dans la bactérie pathogène Gram-négative de type sauvage et présentant une toxicité sensiblement réduite par rapport à la souche de type sauvage. L'invention concerne également des procédés d'utilisation d'une formulation vaccinale contenant le mutant de htrB, l'endotoxine isolée dans ledit mutant ou l'endotoxine isolée dans ledit mutant et conjuguée ensuite à une protéine de support, en vue de l'immunisation d'un individu contre des infections provoquées par des bactéries pathogènes Gram-négatives par administration d'une dose efficace sur le plan prophylactique de la formulation vaccinale.

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