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Redundancy in the requirement for the glycolytic enzymes phosphofructokinase (Pfk) 1 and 2 in the in vivo fitness of Salmonella enterica serovar Typhimurium.

Microb Pathog. 2009 May;46(5):261-5. Epub 2009 Feb 05
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摘要


To assess the role of the glycolytic enzyme phosphofructokinase (Pfk) in the in vivo fitness of the pathogen Salmonella enterica serovar Typhimurium (S. Typhimurium) we have generated single and double gene deletion mutants of the two known isoforms of this enzyme, pfkA and pfkB. In a mouse model of typhoid fever, bacterial counts in the spleen and liver were similar between wild type and single pfkA and pfkB mutant-infected mice. However, a double pfkAB mutant was significantly attenuated for growth in vivo. This defect was complemented by provision of either pfkA or pfkB on pBR322. Together these data show that Pfk activity is required for the full in vivo fitness of S. Typhimurium with functional redundancy between pfkA and pfkB. The level of attenuation of the pfkAB double mutant was not sufficient for its consideration as a live attenuated vaccine strain.

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