Back to Search
Start Over
The syp enhancer sequence plays a key role in transcriptional activation by the σ54-dependent response regulator SypG and in biofilm formation and host colonization by Vibrio fischeri.
- Source :
-
Journal of bacteriology [J Bacteriol] 2013 Dec; Vol. 195 (23), pp. 5402-12. Date of Electronic Publication: 2013 Oct 04. - Publication Year :
- 2013
-
Abstract
- Biofilm formation by Vibrio fischeri is a complex process that requires multiple regulators. One such regulator, the NtrC-like response regulator SypG, controls biofilm formation and host colonization by V. fischeri via its impact on transcription of the symbiosis polysaccharide (syp) locus. SypG is predicted to activate syp transcription by binding to the syp enhancer (SE), a conserved sequence located upstream of four syp promoters. In this study, we performed an in-depth analysis of the sequences necessary for SypG to promote syp transcription and biofilm formation. We found that the SE sequence is necessary for SypG-mediated syp transcription, identified individual bases necessary for efficient activation, and determined that SypG is able to bind to syp promoter regions. We also identified SE sequences outside the syp locus and established that SypG recognizes these sequences as well. Finally, deletion of the SE sequence upstream of sypA led to defects in both biofilm formation and host colonization that could be restored by reintroducing the SE sequence into its native location in the chromosome. This work thus fills in critical gaps in knowledge of the Syp regulatory circuit by demonstrating a role for the SE sequence in SypG-dependent control of biofilm formation and host colonization and by identifying new putative regulon members. It may also provide useful insights into other bacteria, such as Vibrio vulnificus and Vibrio parahaemolyticus, that have syp-like loci and conserved SE sequences.
- Subjects :
- Aliivibrio fischeri genetics
Aliivibrio fischeri metabolism
Enhancer Elements, Genetic genetics
Promoter Regions, Genetic
RNA Polymerase Sigma 54 genetics
RNA Polymerase Sigma 54 metabolism
Aliivibrio fischeri physiology
Biofilms growth & development
Enhancer Elements, Genetic physiology
Gene Expression Regulation, Bacterial physiology
Transcription, Genetic physiology
Transcriptional Activation physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1098-5530
- Volume :
- 195
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- Journal of bacteriology
- Publication Type :
- Academic Journal
- Accession number :
- 24097942
- Full Text :
- https://doi.org/10.1128/JB.00689-13