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TcaR, a putative MarR-like regulator of sarS expression
Nadine McCallum1, Markus Bischoff, Hideki Maki
1Department of Medical Microbiology, University of Zürich, CH-8028 Zürich, Switzerland.
Journal of Bacteriology
|May 6, 2004
Summary
TcaR is a novel Staphylococcus aureus regulator that increases SarS and Protein A expression while decreasing cell surface-associated Protein F. Many lab strains have inactive TcaR, impacting virulence gene studies.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Staphylococcus aureus virulence is regulated by complex genetic networks.
- Understanding novel regulators is crucial for deciphering bacterial pathogenesis.
Purpose of the Study:
- To identify and characterize a novel transcriptional regulator in Staphylococcus aureus.
- To elucidate the role of TcaR in the regulation of virulence-associated genes, specifically SarS and SasF.
Main Methods:
- Sequence homology analysis to identify MarR-like regulators.
- Microarray analysis and Northern blotting to assess gene expression.
- Genetic complementation experiments to validate TcaR function.
Main Results:
- TcaR was identified as a novel regulator in S. aureus.
- TcaR upregulates sarS transcription, leading to increased Protein A expression.
- TcaR attenuates full-length sasF transcription, resulting in truncated transcripts lacking the cell wall anchor motif, thus decreasing surface-associated Protein F.
Conclusions:
- TcaR acts as an activator of sarS and a modulator of sasF expression in S. aureus.
- The inactivation of TcaR in common laboratory strains (NCTC8325) leads to low sarS expression.
- TcaR is a significant factor to consider in studies of S. aureus virulence gene expression.