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Journal of Bacteriology, May 2009, p. 3424-3428, Vol. 191, No. 10
0021-9193/09/$08.00+0     doi:10.1128/JB.01113-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

The Global Virulence Regulator PhcA Negatively Controls the Ralstonia solanacearum hrp Regulatory Cascade by Repressing Expression of the PrhIR Signaling Proteins{triangledown} ,{dagger}

Takeshi Yoshimochi,1 Yasufumi Hikichi,1 Akinori Kiba,1 and Kouhei Ohnishi2*

Laboratory of Plant Pathology and Biotechnology,1 Research Institute of Molecular Genetics, Kochi University, Nankoku, Kochi 783-8502, Japan2

Received 8 August 2008/ Accepted 30 November 2008

PhcA positively and negatively regulates many genes responsible for pathogenicity of Ralstonia solanacearum. The type III secretion system-encoding hrp regulon is one of the negatively controlled operons. PhcA bound to the promoter region of prhIR and repressed its expression, demonstrating that PhcA shuts down the most upstream component of a signal transfer system for hrpB activation.

* Corresponding author. Mailing address: Research Institute of Molecular Genetics, Kochi University, 200 Monobe, Nankoku, Kochi 783-8502, Japan. Phone: 81-88-864-5213. Fax: 81-88-8611-5109. E-mail: kouheio{at}kochi-u.ac.jp

{triangledown} Published ahead of print on 5 December 2008.

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

Journal of Bacteriology, May 2009, p. 3424-3428, Vol. 191, No. 10
0021-9193/09/$08.00+0     doi:10.1128/JB.01113-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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