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Structure/Function Analysis of the Pantoea stewartii Quorum-Sensing Regulator EsaR as an Activator of Transcription


Schu, D J; Carlier, A; Jamison, K P; von Bodman, S; Stevens, A M (2009). Structure/Function Analysis of the Pantoea stewartii Quorum-Sensing Regulator EsaR as an Activator of Transcription. Journal of Bacteriology, 191(24):7402-7409.

Abstract

In Pantoea stewartii subsp. stewartii, two regulatory proteins are key to the process of cell-cell communication
known as quorum sensing: the LuxI and LuxR homologues EsaI and EsaR. Most LuxR homologues function
as activators of transcription in the presence of their cognate acylated homoserine lactone (AHL) signal.
However, EsaR was initially found to function as a repressor in the absence of AHL. Previous studies
demonstrated that, in the absence of AHL, EsaR retains the ability to function as a weak activator of the lux
operon in recombinant Escherichia coli. Here it is shown that both the N-terminal and the C-terminal domains
of EsaR are necessary for positive regulation. A site-directed mutagenesis study, guided by homology modeling
to LuxR and TraR, has revealed three critical residues in EsaR that are involved in activation of RNA
polymerase. In addition, a native EsaR-activated promoter has been identified, which controls expression of a
putative regulatory sRNA in P. stewartii.

Abstract

In Pantoea stewartii subsp. stewartii, two regulatory proteins are key to the process of cell-cell communication
known as quorum sensing: the LuxI and LuxR homologues EsaI and EsaR. Most LuxR homologues function
as activators of transcription in the presence of their cognate acylated homoserine lactone (AHL) signal.
However, EsaR was initially found to function as a repressor in the absence of AHL. Previous studies
demonstrated that, in the absence of AHL, EsaR retains the ability to function as a weak activator of the lux
operon in recombinant Escherichia coli. Here it is shown that both the N-terminal and the C-terminal domains
of EsaR are necessary for positive regulation. A site-directed mutagenesis study, guided by homology modeling
to LuxR and TraR, has revealed three critical residues in EsaR that are involved in activation of RNA
polymerase. In addition, a native EsaR-activated promoter has been identified, which controls expression of a
putative regulatory sRNA in P. stewartii.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Plant and Microbial Biology
Dewey Decimal Classification:580 Plants (Botany)
Date:December 2009
Deposited On:11 Dec 2009 13:03
Last Modified:05 Apr 2016 13:34
Publisher:American Society for Microbiology
ISSN:0021-9193
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1128/JB.00994-09

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