The general stress response sigma factor σE1 directly and indirectly regulates the transcription of dozens of genes that influence stress survival and host infection in the zoonotic pathogen Brucella abortus. Characterizing the functions of σE1-regulated genes therefore would contribute to… Read more ›
Gene network analysis identifies a central post-transcriptional regulator of cellular stress survival
Cells adapt to shifts in their environment by remodeling transcription. Measuring changes in transcription at the genome scale is now routine, but defining the functional significance of individual genes within large gene expression datasets remains a major challenge. We applied… Read more ›
Glutathionylation, the formation of reversible mixed disulfides between glutathione and protein cysteine residues, is a posttranslational modification previously observed for intracellular proteins of bacteria. Here we show that Yersinia pestis LcrV, a secreted protein capping the type III secretion machine,… Read more ›
Conserved ABC Transport System Regulated by the General Stress Response Pathways of Alpha- and Gammaproteobacteria
Brucella abortus σE1 is an EcfG family sigma factor that regulates the transcription of dozens of genes in response to diverse stress conditions and is required for maintenance of chronic infection in a mouse model. A putative ATP-binding cassette transporter… Read more ›
Host infection by microbial pathogens cues global changes in microbial and host cell biology that facilitate microbial replication and disease. The complete maps of thousands of bacterial and viral genomes have recently been defined; however, the rate at which physiological… Read more ›
Brucella abortus is an intracellular bacterial pathogen and an etiological agent of the zoonotic disease known as brucellosis. Brucellosis can be challenging to treat with conventional antibiotic therapies and, in some cases, may develop into a debilitating and life-threatening chronic… Read more ›
Brucella abortus ΔrpoE1 confers protective immunity against wild type challenge in a mouse model of brucellosis
The Brucella abortus general stress response (GSR) system regulates activity of the alternative sigma factor, σ(E1), which controls transcription of approximately 100 genes and is required for persistence in a BALB/c mouse chronic infection model. We evaluated the host response… Read more ›
WrpA is an atypical flavodoxin-family protein under regulatory control of the Brucella abortus general stress response system.
The general stress response (GSR) system of the intracellular pathogen Brucella abortus controls transcription of approximately 100 genes in response to a range of stress cues. The core genetic regulatory components of the GSR are required for B. abortus survival… Read more ›
Structural asymmetry in a conserved signaling system that regulates division, replication and virulence of an intracellular pathogen.
We have functionally and structurally defined an essential protein phosphorelay that regulates expression of genes required for growth, division, and intracellular survival of the global zoonotic pathogen Brucella abortus. Our study delineates phosphoryl transfer through this molecular pathway, which initiates… Read more ›
The Brucella abortus virulence regulator, LovhK, is a sensor kinase in the general stress response signaling pathway
Summary In the intracellular pathogen Brucella abortus, the general stress response (GSR) signaling system determines survival under acute stress conditions in vitro, and is required for long-term residence in a mammalian host. To date, the identity of the Brucella sensor… Read more ›