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Single missense mutations in Vi capsule synthesis genes confer hypervirulence to Salmonella Typhi

Nat Commun. 2024-06; 
Gi Young Lee, Jeongmin Song
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Recombinant Proteins … His-Sdhaf2 were purified from Escherichia coli and purchased from GenScript Biotech. Briefly, the indicated amounts of recombinant proteins were incubated with 40 μl of 50% slurry of … Get A Quote

摘要

Many bacterial pathogens, including the human exclusive pathogen Salmonella Typhi, express capsular polysaccharides as a crucial virulence factor. Here, through S. Typhi whole genome sequence analyses and functional studies, we found a list of single point mutations that make S. Typhi hypervirulent. We discovered a single point mutation in the Vi biosynthesis enzymes that control Vi polymerization or acetylation is enough to result in different capsule variants of S. Typhi. All variant strains are pathogenic, but the hyper Vi capsule variants are particularly hypervirulent, as demonstrated by the high morbidity and mortality rates observed in infected mice. The hypo Vi capsule variants have primarily been ident... More

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