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1 Laboratoire de Chimie Bactérienne, Institut de Biologie Structurale et Microbiologie, CNRS, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
2 Génétique Microbienne, INRA, Domaine de Vilvert, 78352 Jouy en Josas Cedex, France
Correspondence
François Denizot
denizot{at}ibsm.cnrs-mrs.fr
The genome of Bacillus subtilis, like those of some other AT-rich Gram-positive bacteria, has the uncommon feature of containing several copies of arrangements in which the genes encoding two-component and cognate ABC transporter systems are adjacent. As the function of one of these systems, the product of the yxd locus, is still unknown, it was analysed further in order to get some clues on the physiological role of the gene products it encodes. The yxdJ gene was shown to encode a DNA-binding protein that directly controls transcription of the neighbouring operon encoding the ABC transporter YxdLM. Primer extension and DNase protection experiments allowed precise definition of the yxdLM transcription start and controlling region. Two putative direct repeats were identified that are proposed to be the YxdJ response regulator binding sites. Whole-cell transcriptome analyses revealed that the YxdJ regulon is extremely restricted. In addition to the yxdJKLMyxeA operon, only a few genes involved in modifications of the bacterial cell wall were shown to be regulated by YxdJ.
Present address: Department of Molecular Biology and Microbiology, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA.
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