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Volume 157, Issue 11

Analysis of two-component sensor proteins involved in the response to acid stimuli in Free

Abstract

The virulence of depends on proteins that are produced by this bacterium. The production of virulence proteins depends on environmental factors, and two-component regulatory systems are considered to be involved in sensing these factors. One of the environmental factors is acid stimuli. We established knockout strains in all speculated two-component regulatory sensor proteins of the M1 clinical strain of and examined their relevance to acid stimuli. The parental strain and its derived knockout strains were cultured in a medium adjusted to pH 7.6 or 6.0, and their growth in broth was compared. The sensor knockout strain showed significant growth reduction compared with the parental strain in broth at pH 6.0, suggesting that the Spy1622 two-component sensor protein is involved in sensing acid stimuli. To further examine the role of the Spy1622 two-component sensor protein in virulence, blood bactericidal assays and mouse infection model experiments were performed. We found that the knockout strain was less virulent than the parental strain, which suggests that the Spy1622 two-component sensor protein could play an important role in virulence.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Funding
This study was supported by the:
  • Ministry of Education, Science and Culture of the Japanese government (Award 21590485)
  • Ohyama Health Foundation Inc
© 2011 SGM
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2011-11-01
2024-04-23
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Analysis of two-component sensor proteins involved in the response to acid stimuli in Streptococcus pyogenes
Microbiology 157, 3187 (2011); https://doi.org/10.1099/mic.0.050534-0
/content/journal/micro/10.1099/mic.0.050534-0
/content/journal/micro/10.1099/mic.0.050534-0
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