NDLI: A ToxR Homolog from Vibrio anguillarum Serotype O1 Regulates Its Own Production, Bile Resistance, and Biofilm Formation

Content Provider	PubMed Central
Author	Wang, Su-yan Johan, Lauritz Jass, Jana Milton, Debra L.
Copyright Year	2002
Abstract	ToxR, a transmembrane regulatory protein, has been shown to respond to environmental stimuli. To better understand how the aquatic bacterium Vibrio anguillarum, a fish pathogen, responds to environmental signals that may be necessary for survival in the aquatic and fish environment, toxR and toxS from V. anguillarum serotype O1 were cloned. The deduced protein sequences were 59 and 67% identical to the Vibrio cholerae ToxR and ToxS proteins, respectively. Deletion mutations were made in each gene and functional analyses were done. Virulence analyses using a rainbow trout model showed that only the toxR mutant was slightly decreased in virulence, indicating that ToxR is not a major regulator of virulence factors. The toxR mutant but not the toxS mutant was 20% less motile than the wild type. Like many regulatory proteins, ToxR was shown to negatively regulate its own expression. Outer membrane protein (OMP) preparations from both mutants indicated that ToxR and ToxS positively regulate a 38-kDa OMP. The 38-kDa OMP was shown to be a major OMP, which cross-reacted with an antiserum to OmpU, an outer membrane porin from V. cholerae, and which has an amino terminus 75% identical to that of OmpU. ToxR and to a lesser extent ToxS enhanced resistance to bile. Bile in the growth medium increased expression of the 38-kDa OMP but did not affect expression of ToxR. Interestingly, a toxR mutant forms a better biofilm on a glass surface than the wild type, suggesting a new role for ToxR in the response to environmental stimuli.
Related Links	http://dx.doi.org/10.1128/jb.184.6.1630-1639.2002
Ending Page	1639
Page Count	10
Starting Page	1630
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	6
Volume Number	184
Language	English
Publisher	American Society for Microbiology
Publisher Date	2002-03-15
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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