Neisseria mutants, lipooligosaccharides and immunogenic...

C - Chemistry – Metallurgy – 07 – H

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C07H 1/00 (2006.01) A61K 39/00 (2006.01) A61K 39/02 (2006.01) A61K 39/095 (2006.01) C07K 14/22 (2006.01) C12N 15/52 (2006.01)

Patent

CA 2479879

Provided herein are mutant strains of Neisseria meningitidis which produce Kdo- free lipid A as well as the Kdo-free lipid A molecules and immunogenic compositions containing such Kdo-free lipid A molecules from a Neisseria strain containing a genetically stable mutation which inactivates a gene selected from the group consisting of genes encoding arabinose-5-phosphate isomerase, CMP-Kdo synthetase and CMP-Kdo transferase. N. meningitidis NMB206 is a specifically exemplified strain which harbors a stable insertion mutation in the gene (kpsF) encoding A5P isomerase; strain NMB-249 is a specifically exemplified strain with a stable insertion mutation in the gene (kdtA) encoding CMP-Kdo synthetase, and strain NMB259 is specifically exemplified strain with a stable insertion mutation in the gene (kdsB) encoding CMP-Kdo transferase. Also provided by the present invention are methods for the production of Lipid A free of 3-keto-3-deoxyoctanoic acid using these genetically stable N. meningitidis mutants. Also describes is pYT250, a plasmid functional in neisseriae and in enterics such as Escherichia coli.

La présente invention concerne des souches mutantes de Neizzeria neningitidis qui produisent du lipide A exempt de Kdo ainsi que des molécules de lipide A exempt de Kdo et des compositions immunogènes contenant de telles molécules de lipide A exempt de Kdo provenant d'une souche Neizzeria contenant une mutation génétiquement stable qui inactive un gène choisi dans le groupe constitué ds gènes codant l'isomérase de l'arabinose-5-phosphate, la CMP-Kdo synthétase et la CMP-Kdo transférase. N. meningitidis NMB206 est une souche spécifiquement utilisée comme exemple qui héberge une mutation d'insertion stable dans le gène (kpsF) codant l'isomérase de l'A5P; la souche NMB-249 est une souche spécifiquement utilisée comme exemple comportant une mutation d'insertion stable dans le gène (kdtA) codant la CMP-Kdo synthétase, et la souche NMB259 est une souche spécifiquement utilisée comme exemple comportant une mutation d'insertion stable dans le gène (kdsB) codant la CMP-Kdo transférase. L'invention concerne également des procédés permettant la production d'un Lipide A exempt d'acide 3-céto-3-désoxyoctanoïque au moyen de ces mutants génétiquement stables de N. meningitidis. L'invention concerne enfin pYT250, un plasmide fonctionnel dans les neisseriae et les entériques tels que Escherichia coli.

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