Transcriptional and post-transcriptional regulation of the GmaR antirepressor governs temperature-dependent control of flagellar motility in Listeria monocytogenes.

ABSTRACT: Flagellar motility in Listeria monocytogenes (Lm) is restricted to temperatures below 37 degrees C due to the opposing activities of the MogR transcriptional repressor and the GmaR antirepressor. Previous studies have suggested that both the DegU response regulator and MogR regulate expression of GmaR. In this report, we further define the role of DegU for GmaR production and flagellar motility. We demonstrate that deletion of the receiver domain of DegU has no effect on flagellar motility in Lm. Using transcriptional reporter fusions, we determined that gmaR is cotranscribed within an operon initiating with fliN. Furthermore, the fliN-gmaR promoter (p(fliN-gmaR)) is transcriptionally activated by DegU and is also MogR-repressed. DNA affinity purification, gel mobility shift and footprinti

SUBMITTER: Kamp HD 

PROVIDER: S-EPMC2807129 | biostudies-literature | 2009 Oct

REPOSITORIES: biostudies-literature