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Response regulator important in pathogenesis of Streptococcus suis serotype 2
Astrid de Greeff1, Herma Buys, Loek van Alphen
1Department of Medical Microbiology, University of Amsterdam, Academical Medical Center, The Netherlands. a.degreeff@id.wag-ur.nl
Microbial Pathogenesis
|October 19, 2002
Summary
This study identifies RevS, an orphan response regulator in Streptococcus suis serotype 2, crucial for bacterial colonization and pathogenesis. Its absence attenuates infection, highlighting its role in disease development.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Molecular Biology
Background:
- Streptococcus suis serotype 2 is a significant zoonotic pathogen.
- Understanding the molecular mechanisms of S. suis pathogenesis is critical for disease control.
Purpose of the Study:
- To characterize the role of the orphan response regulator RevS in Streptococcus suis serotype 2.
- To investigate the impact of RevS on bacterial colonization and virulence.
Main Methods:
- Cloning and sequencing of the RevS gene.
- Construction and analysis of an isogenic RevS knock-out mutant.
- Competitive colonization assays in piglets.
- Comparative proteomic analysis of wild-type and mutant strains.
Main Results:
- RevS was identified as the first orphan response regulator in S. suis serotype 2.
- A RevS knock-out mutant showed attenuated colonization in specific S. suis organs in piglets.
- Proteomic analysis revealed RevS represses an unknown protein in the protoplast fraction during exponential growth.
Conclusions:
- RevS plays a significant role in the pathogenesis of Streptococcus suis serotype 2 infections.
- The identified orphan response regulator is essential for effective bacterial colonization.
- Further research is needed to identify the repressed protein and elucidate its function in S. suis pathogenesis.