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Journal of Bacteriology, May 2001, p. 2746-2754, Vol. 183, No. 9
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.9.2746-2754.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

The ToxR-Mediated Organic Acid Tolerance Response of Vibrio cholerae Requires OmpU

D. Scott Merrell,1 Camella Bailey,2 James B. Kaper,2 and Andrew Camilli1,*

Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111,1 and Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, Maryland 212012

Received 25 October 2000/Accepted 7 February 2001

It was previously demonstrated that the intestinal pathogen Vibrio cholerae could undergo an adaptive stress response known as the acid tolerance response (ATR). The ATR is subdivided into two branches, inorganic ATR and organic ATR. The transcriptional regulator ToxR, while not involved in inorganic ATR, is required for organic ATR in a ToxT-independent manner. Herein, we investigate the effect of organic acid stress on global protein synthesis in V. cholerae and show by two-dimensional gel electrophoresis that the stress response alters the expression of more than 100 polypeptide species. The expression of more than 20 polypeptide species is altered in a toxR strain compared to the wild type. Despite this, ectopic expression of the porin OmpU from an inducible promoter is shown to be sufficient to bypass the toxR organic ATR defect. Characterization of the effect of organic acid stress on ompU and ompT transcription reveals that while ompU transcription remains virtually unaffected, ompT transcription is repressed in a ToxR-independent manner. These transcript levels are similarly reflected in the extent of accumulation of OmpU and OmpT. Possible roles for OmpU in organic acid resistance are discussed.

* Corresponding author. Mailing address: Tufts University School of Medicine, Department of Molecular Biology and Microbiology, 136 Harrison Ave., Boston, MA 02111. Phone: (617) 636-2144. Fax: (617) 636-0337. E-mail: andrew.camilli{at}tufts.edu.

Journal of Bacteriology, May 2001, p. 2746-2754, Vol. 183, No. 9
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.9.2746-2754.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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