Background: The human pathogen Streptococcus pyogenes adapts to vascular leakage at the site of infection. Results: S. pyogenes modifies the production of 213 in plasma determined using quantitative proteomics. Conclusion: The results clarify the function of HSA-binding proteins in S. pyogenes. Significance: Our data demonstrates the power of the quantitative mass spectrometry strategy to investigate bacterial adaptation to a given environment. Streptococcus pyogenes is a major bacterial pathogen and a potent inducer of inflammation causing plasma leakage at the site of infection. A combination of label-free quantitative mass spectrometry-based proteomics strategies were used to measure how the intracellular proteome homeostasis of S. pyogenes is influenced by the presence of human plasma, identifying and quantifying 842 proteins. In plasma the bacterium modifies its production of 213 proteins, and the most pronounced change was the complete down-regulation of proteins required for fatty acid biosynthesis. Fatty acids are transported by albumin (HSA) in plasma. S. pyogenes expresses HSA-binding surface proteins, and HSA carrying fatty acids reduced the amount of fatty acid biosynthesis proteins to the same extent as plasma. The results clarify the function of HSA-binding proteins in S. pyogenes and underline the power of the quantitative mass spectrometry strategy used here to investigate bacterial adaptation to a given environment.
Streptococcus pyogenes in Human Plasma
J. Malmström,C. Karlsson,P. Nordenfelt,Reto Ossola,Hendrik Weisser,Andreas Quandt,K. Hansson,R. Aebersold,L. Malmström,L. Björck
Published 2011 in Journal of Biological Chemistry
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- Publication year
2011
- Venue
Journal of Biological Chemistry
- Publication date
2011-11-23
- Fields of study
Biology, Medicine
- Identifiers
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Semantic Scholar, PubMed
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