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Journal of Bacteriology, January 2000, p. 526-528, Vol. 182, No. 2
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A Region of the Transmembrane Regulatory Protein ToxR That Tethers the Transcriptional Activation Domain to the Cytoplasmic Membrane Displays Wide Divergence among Vibrio Species

Carlos R. Osoriodagger and Karl E. Klose*

Department of Microbiology, University of Texas Health Science Center, San Antonio, Texas

Received 10 August 1999/Accepted 27 October 1999

The virulence regulatory protein ToxR of Vibrio cholerae is unique in that it contains a cytoplasmic DNA-binding-transcriptional activation domain, a transmembrane domain, and a periplasmic domain. Although ToxR and other transmembrane transcriptional activators have been discovered in other bacteria, little is known about their mechanism of activation. Utilizing degenerate oligonucleotides and PCR, we have amplified internal toxR gene sequences from seven Vibrio and Photobacterium species and subspecies, demonstrating that toxR is an ancestral gene of the family Vibrionaceae. Sequence alignment of all available ToxR amino acid sequences revealed a region between the transcriptional activation and transmembrane domains that displays wide divergence among Vibrio species. We hypothesize that this region merely tethers the transcriptional activation domain to the cytoplasmic membrane and thus can tolerate wide divergence and multiple insertions and deletions. The divergence in the tether region at the nucleotide level may provide a useful tool for the distinction of Vibrio and Photobacterium species.

* Corresponding author. Mailing address: Department of Microbiology, University of Texas Health Science Center, 7703 Floyd Curl Dr., San Antonio TX 78284-7758. Phone: (210) 567-3990. Fax: (210) 567-9231. E-mail: klose{at}uthscsa.edu.

dagger Present address: Department of Microbiology, University of Santiago de Compostela, Campus Sur, 15706 Santiago de Compostela, Spain.

Journal of Bacteriology, January 2000, p. 526-528, Vol. 182, No. 2
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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