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Journal of Bacteriology, February 2004, p. 1175-1181, Vol. 186, No. 4
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.4.1175-1181.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Identification of Genes Controlled by the Essential YycG/YycF Two-Component System of Staphylococcus aureus

Unité de Biochimie Microbienne, CNRS URA 2172, Institut Pasteur, 75724 Paris Cedex 15, France

Received 2 July 2003/ Accepted 23 October 2003

The YycG/YycF essential two-component system (TCS), originally identified in Bacillus subtilis, is very highly conserved and appears to be specific to low-G+C gram-positive bacteria, including several pathogens such as Staphylococcus aureus. By studying growth of S. aureus cells where the yyc operon is controlled by an isopropyl-ß-D-thiogalactopyranoside (IPTG)-inducible promoter, we have shown that this system is essential in S. aureus during growth at 37°C and that starvation for the YycG/YycF regulatory system leads to cell death. During a previous study of the YycG/YycF TCS of B. subtilis, we defined a potential YycF consensus recognition sequence, consisting of two hexanucleotide direct repeats, separated by five nucleotides [5'-TGT(A/T)A(A/T/C)-N₅-TGT(A/T)A(A/T/C)-3']. A detailed DNA motif analysis of the S. aureus genome indicates that there are potentially 12 genes preceded by this sequence, 5 of which are involved in virulence. An in vitro approach was undertaken to determine which of these genes are controlled by YycF. The YycG and YycF proteins of S. aureus were overproduced in Escherichia coli and purified. Autophosphorylation of the YycG kinase and phosphotransfer to YycF were shown in vitro. Gel mobility shift and DNase I footprinting assays were used to show direct binding in vitro of purified YycF to the promoter region of the ssaA gene, encoding a major antigen and previously suggested to be controlled by YycF. YycF was also shown to bind specifically to the promoter regions of two genes, encoding the IsaA antigen and the LytM peptidoglycan hydrolase, in agreement with the proposed role of this system in controlling virulence and cell wall metabolism.

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