Proteomics analysis of the causative agent of typhoid fever

Charles Ansong, Hyunjin Yoon, Angela D. Norbeck, Jean K. Gustin, Jason E. McDermott, Heather M. Mottaz, Joanne Rue, Joshua N. Adkins, Fred Heffron, Richard D. Smith

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Typhoid fever is a potentially fatal disease caused by the bacterial pathogen Salmonella enterica serotype Typhi (S. typhi). S. typhi infection is a complex process that involves numerous bacterially encoded virulence determinants, and these are thought to confer both stringent human host specificity and a high mortality rate. In the present study, we used a liquid chromatography-mass spectrometry (LC-MS)-based proteomics strategy to investigate the proteome of logarithmic, stationary phase, and low pH/low magnesium (MgM) S. typhi cultures. This represents the first large-scale comprehensive characterization of the S. typhi proteome. Our analysis identified a total of 2066 S. typhi proteins. In an effort to identify putative S. typhi-specific virulence factors, we then compared our S. typhi results to those obtained in a previously published study of the S. typhimurium proteome under similar conditions (Adkins, J. N. et al. Mol. Cell. Proteomics 2006, 5, 1450-1461). Comparative proteomics analysis of S. typhi strain Ty2 and S. typhimurium strain LT2 revealed a subset of highly expressed proteins unique to S. typhi that were exclusively detected under conditions that are thought to mimic the infective state in macrophage cells. These proteins included CdtB, HlyE, and gene products of t0142, t1108, t1109, t1476, and t1602. The differential expression of T1108, T1476, and HlyE was confirmed by Western blot analysis. When our observations are taken together with the current literature, they suggest that this subset of proteins may play a role in S. typhi pathogenesis and human host specificity.

Original languageEnglish (US)
Pages (from-to)546-557
Number of pages12
JournalJournal of Proteome Research
Issue number2
StatePublished - Feb 2008
Externally publishedYes


  • Mass spectrometry
  • Pathogen
  • Proteomics
  • Salmonella typhi
  • Salmonella typhimurium

ASJC Scopus subject areas

  • Biochemistry
  • General Chemistry


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