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 Previous Article

Journal of Bacteriology, November 2005, p. 7876-7880, Vol. 187, No. 22
0021-9193/05/$08.00+0     doi:10.1128/JB.187.22.7876-7880.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Identification of a Novel Essential Two-Component Signal Transduction System, YhcSR, in Staphylococcus aureus{dagger}

Junsong Sun, Li Zheng, Christina Landwehr, Junshu Yang, and Yinduo Ji*

Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108

Received 13 July 2005/ Accepted 31 August 2005

Two-component signal transduction systems play an important role in the ability of bacteria to adapt to various environments by sensing changes in their habitat and by altering gene expression. In this study, we report a novel two-component system, YhcSR, in Staphylococcus aureus which is required for bacterial growth in vitro. We found that the down-regulation of yhcSR expression by induced yhcS antisense RNA can inhibit and terminate bacterial growth. Moreover, without complementary yhcS or yhcR, no viable yhcS or yhcR gene replacement mutant was recoverable. Collectively, these results demonstrated that the YhcSR regulatory system is indispensable for S. aureus growth in culture. Moreover, induced yhcS antisense RNA selectively increased bacterial susceptibility to phosphomycin. These data suggest that YhcSR probably modulates the expression of genes critical for bacterial survival and may be a potential target for the development of novel antibacterial agents.

* Corresponding author. Mailing address: 1971 Commonwealth Ave., St. Paul, MN 55108. Phone: (612) 624-2757. Fax: (612) 625-5203. E-mail: jixxx002{at}umn.edu.

{dagger} Supplemental material for this article may be found at http://jb.asm.org/.

Journal of Bacteriology, November 2005, p. 7876-7880, Vol. 187, No. 22
0021-9193/05/$08.00+0     doi:10.1128/JB.187.22.7876-7880.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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