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Open AccessArticle

The Transcriptional Repressor, MtrR, of the mtrCDE Efflux Pump Operon of Neisseria gonorrhoeae Can Also Serve as an Activator of “off Target” Gene (glnE) Expression

by 1,† and 1,2,3,*
1
Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA
2
The Emory Antibiotic Resistance Center, Emory University School of Medicine, Atlanta, GA 30322, USA
3
Laboratories of Bacterial Pathogenesis, VA Medical Center, Decatur, GA 30033, USA
*
Author to whom correspondence should be addressed.
Current Address: Department of Biology, University of North Georgia, Dahlonega, GA 30597, USA.
Academic Editor: Helen I. Zgurskaya
Antibiotics 2015, 4(2), 188-197; https://doi.org/10.3390/antibiotics4020188
Received: 14 April 2015 / Accepted: 26 May 2015 / Published: 3 June 2015
(This article belongs to the Special Issue Multi-drug Efflux and Drug Permeation)
MtrR is a well-characterized repressor of the Neisseria gonorrhoeae mtrCDE efflux pump operon. However, results from a previous transcriptional profiling study suggested that MtrR also represses or activates expression of at least sixty genes outside of the mtr locus. Evidence that MtrR can directly repress so-called “off target” genes has previously been reported; in particular, MtrR was shown to directly repress glnA, which encodes glutamine synthetase. In contrast, evidence for the ability of MtrR to directly activate expression of gonococcal genes has been lacking; herein, we provide such evidence. We now report that MtrR has the ability to directly activate expression of glnE, which encodes the dual functional adenyltransferase/deadenylase enzyme GlnE that modifies GlnA resulting in regulation of its role in glutamine biosynthesis. With its capacity to repress expression of glnA, the results presented herein emphasize the diverse and often opposing regulatory properties of MtrR that likely contributes to the overall physiology and metabolism of N. gonorrhoeae. View Full-Text
Keywords: drug efflux; DNA-binding protein; glutamine biosynthesis; Neisseria gonorrhoeae; transcriptional control drug efflux; DNA-binding protein; glutamine biosynthesis; Neisseria gonorrhoeae; transcriptional control
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Johnson, P.J.T.; Shafer, W.M. The Transcriptional Repressor, MtrR, of the mtrCDE Efflux Pump Operon of Neisseria gonorrhoeae Can Also Serve as an Activator of “off Target” Gene (glnE) Expression. Antibiotics 2015, 4, 188-197.

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