Vaccine

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 1/21 (2006.01) A61K 39/095 (2006.01) C07K 14/22 (2006.01) C07K 14/315 (2006.01) C07K 16/12 (2006.01) C12N 15/31 (2006.01) C12N 15/62 (2006.01) C12N 15/63 (2006.01)

Patent

CA 2550927

The present invention discloses a Gram negative bacterium in which the expression of a protein involved in LPS transport to the outer membrane is functionally downregulated such that the level of LPS in the outer membrane is decreased compared to a wild-type Gram negative bacterium. Down regulation of Imp and MsbA proteins can result in such a bacterium. Outer membrane vesicle preparations derived from the Gram negative bacterium of the invention can be used in vaccines to provide protection against bacterial infection.

L'invention concerne une bactérie Gram négatif dans laquelle l'expression d'une protéine impliquée dans le transport de lipopolysaccharides (LPS) vers la membrane extérieure est régulé fonctionnellement vers le bas de telle manière que le taux de LPS dans la membrane extérieure est réduit par rapport à une bactérie Gram négatif de type sauvage. La régulation vers le bas de protéines Imp et MsbA peut fournir de telles bactéries. Des préparations de vésicules membranaires extérieures dérivées de la bactérie Gram négatif selon l'invention peuvent être employées dans des vaccins afin d'offrir une protection contre des infections bactériennes.

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