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Salmonella

  • Regulatory Cross Talk between Motility and Interbacterial Communication in <span class="named-content genus-species" id="named-content-1">Salmonella enterica</span> Serovar Typhimurium
    Research Article | Spotlight
    Regulatory Cross Talk between Motility and Interbacterial Communication in Salmonella enterica Serovar Typhimurium

    Initiation of bacterial transcription requires association of a σ factor with the core RNA polymerase to facilitate sequence-specific recognition of promoter elements. FliA is a widely conserved σ factor that directs transcription of genes involved in flagellar motility.

    Jonathan Plitnick, Fabienne F. V. Chevance, Anne Stringer, Kelly T. Hughes, Joseph T. Wade
  • Envelope Stress and Regulation of the <em>Salmonella</em> Pathogenicity Island 1 Type III Secretion System
    Research Article | Spotlight
    Envelope Stress and Regulation of the Salmonella Pathogenicity Island 1 Type III Secretion System

    Salmonella causes worldwide foodborne illness, leading to massive disease burden and an estimated 600,000 deaths per year. Salmonella infects orally and invades intestinal epithelial cells using a type 3 secretion system that directly injects effector proteins into host cells. This first step in invasion is tightly regulated by a variety of inputs. In this work, we demonstrate that Salmonella senses the...

    Alexander D. Palmer, James M. Slauch
  • HilD, HilC, and RtsA Form Homodimers and Heterodimers To Regulate Expression of the <em>Salmonella</em> Pathogenicity Island I Type III Secretion System
    Research Article
    HilD, HilC, and RtsA Form Homodimers and Heterodimers To Regulate Expression of the Salmonella Pathogenicity Island I Type III Secretion System

    The SPI1 type three secretion system is a key virulence factor required for Salmonella to both cause gastroenteritis and initiate serious systemic disease. The system responds to numerous environmental signals in the intestine, integrating this information via a complex regulatory network. Here, we show that the primary regulatory proteins in the network function as both homodimers and heterodimers, providing information...

    Koh-Eun Narm, Marinos Kalafatis, James M. Slauch
  • Under Elevated c-di-GMP in <span class="named-content genus-species" id="named-content-1">Escherichia coli</span>, YcgR Alters Flagellar Motor Bias and Speed Sequentially, with Additional Negative Control of the Flagellar Regulon via the Adaptor Protein RssB
    Research Article | Spotlight
    Under Elevated c-di-GMP in Escherichia coli, YcgR Alters Flagellar Motor Bias and Speed Sequentially, with Additional Negative Control of the Flagellar Regulon via the Adaptor Protein RssB

    Flagellum-driven motility has been studied in E. coli and Salmonella for nearly half a century. Over 60 genes control flagellar assembly and function. The expression of these genes is regulated at multiple levels in response to a variety of environmental signals. Cues that elevate c-di-GMP levels, however, inhibit motility by direct binding of the effector...

    Vincent Nieto, Jonathan D. Partridge, Geoffrey B. Severin, Run-Zhi Lai, Christopher M. Waters, John S. Parkinson, Rasika M. Harshey
  • The Small RNA PinT Contributes to PhoP-Mediated Regulation of the <em>Salmonella</em> Pathogenicity Island 1 Type III Secretion System in <span class="named-content genus-species" id="named-content-1">Salmonella enterica</span> Serovar Typhimurium
    Research Article
    The Small RNA PinT Contributes to PhoP-Mediated Regulation of the Salmonella Pathogenicity Island 1 Type III Secretion System in Salmonella enterica Serovar Typhimurium

    Salmonella is one of the most important food-borne pathogens, infecting over one million people in the United States every year. These bacteria use a needle-like device to interact with intestinal epithelial cells, leading to invasion of the cells and induction of inflammatory diarrhea. A complex regulatory network controls expression of the invasion system in response to numerous environmental signals. Here we explore the...

    Kyungsub Kim, Alexander D. Palmer, Carin K. Vanderpool, James M. Slauch
  • Human Bile-Mediated Regulation of <em>Salmonella</em> Curli Fimbriae
    Special Issue Meeting Presentation
    Human Bile-Mediated Regulation of Salmonella Curli Fimbriae

    Typhoid fever is caused by Salmonella enterica serovar Typhi, and 3% to 5% of patients become chronic gallbladder (GB) carriers (also known as “Typhoid Marys”). We have previously demonstrated a role for Salmonella biofilm formation on gallstones as a primary mechanism of carriage. In this study, we found that the important biofilm extracellular matrix...

    Juan F. González, Lauren Tucker, James Fitch, Amy Wetzel, Peter White, John S. Gunn
  • Cytotoxic Curli Intermediates Form during <em>Salmonella</em> Biofilm Development
    Special Issue Meeting Presentation
    Cytotoxic Curli Intermediates Form during Salmonella Biofilm Development

    Amyloid proteins are the major proteinaceous components of biofilms, which are associated with up to 65% of human bacterial infections. Amyloids produced by human cells are also associated with diseases such as Alzheimer’s. The amyloid monomeric subunits self-associate to form oligomers, protofibrils, and finally mature fibrils. Amyloid β oligomers are more cytotoxic to cells than the mature amyloid fibrils. Here we detected oligomeric...

    Lauren K. Nicastro, Sarah A. Tursi, Long S. Le, Amanda L. Miller, Andrey Efimov, Bettina Buttaro, Vincent Tam, Çağla Tükel
  • YshB Promotes Intracellular Replication and Is Required for <em>Salmonella</em> Virulence
    Research Article
    YshB Promotes Intracellular Replication and Is Required for Salmonella Virulence

    Salmonella gastroenteritis is one of the most common causes of foodborne disease, possibly affecting millions of people globally each year. Here we characterize the role of a novel small protein, YshB, in mediating Salmonella intracellular survival. This elucidation adds to the body of knowledge regarding how this bacterium achieves intracellular survival.

    Rajdeep Bomjan, Mei Zhang, Daoguo Zhou
  • PhoP-Mediated Repression of the SPI1 Type 3 Secretion System in <span class="named-content genus-species" id="named-content-1">Salmonella enterica</span> Serovar Typhimurium
    Research Article
    PhoP-Mediated Repression of the SPI1 Type 3 Secretion System in Salmonella enterica Serovar Typhimurium

    Salmonella is one of the most common foodborne pathogens, causing an estimated 1.2 million illnesses per year in the United States. A key step in infection is the activation of the bacterial invasion machinery, which induces uptake of the bacterium into epithelial cells and leads to induction of inflammatory diarrhea. Upon entering the vacuolar compartments of host cells, Salmonella senses an environmental transition...

    Alexander D. Palmer, Kyungsub Kim, James M. Slauch
  • Pathoadaptive Alteration of <em>Salmonella</em> Biofilm Formation in Response to the Gallbladder Environment
    Meeting Presentation
    Pathoadaptive Alteration of Salmonella Biofilm Formation in Response to the Gallbladder Environment

    Chronic carriers are the main reservoirs for the spread of typhoid fever in regions of endemicity. Salmonella Typhi forms biofilms on gallstones in order to persist. A strain with enhanced biofilm-forming ability was recovered after a nine-month chronic-carriage mouse study. After sequencing this strain and recreating some of the mutations, we could not duplicate the phenotype. The isolate did show a difference in flagella, a...

    Michael R. Neiger, Juan F. González, Geoffrey Gonzalez-Escobedo, Harkness Kuck, Peter White, John S. Gunn

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