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Infection and Immunity
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bacterial pathogenesis

  • Microbial Lipid A Remodeling Controls Cross-Presentation Efficiency and CD8 T Cell Priming by Modulating Dendritic Cell Function
    Cellular Microbiology: Pathogen-Host Cell Molecular Interactions
    Microbial Lipid A Remodeling Controls Cross-Presentation Efficiency and CD8 T Cell Priming by Modulating Dendritic Cell Function

    The majority of Gram-negative bacteria elicit a potent immune response via recognition of lipid A expressed on the outer bacterial membrane by the host immune receptor Toll-like receptor 4 (TLR4). However, some Gram-negative bacteria evade detection by TLR4 or alter the outcome of TLR4 signaling by modification of lipid A species.

    George Papadopoulos, Robert Berland, Ashwini Sunkavalli, Stephen R. Coats, Richard P. Darveau, Caroline A. Genco
  • Cardiotropic Isolates of <span class="named-content genus-species" id="named-content-1">Listeria monocytogenes</span> with Enhanced Vertical Transmission Dependent upon the Bacterial Surface Protein InlB
    Bacterial Infections
    Cardiotropic Isolates of Listeria monocytogenes with Enhanced Vertical Transmission Dependent upon the Bacterial Surface Protein InlB

    Listeria monocytogenes is a facultative Gram-positive intracellular bacterium that is capable of causing serious invasive infections in pregnant women, resulting in abortion, still-birth, and disseminated fetal infection. Previously, a clinical L. monocytogenes isolate, 07PF0776, was identified as...

    Nicole M. Lamond, P. David McMullen, Dhanendra Paramasvaran, Lavanya Visvahabrathy, Samuel J. Eallonardo, Akhil Maheswhari, Nancy E. Freitag
  • Generation and Characterization of Typhoid Toxin-Neutralizing Human Monoclonal Antibodies
    Molecular Pathogenesis
    Generation and Characterization of Typhoid Toxin-Neutralizing Human Monoclonal Antibodies

    Typhoid toxin is a virulence factor of Salmonella enterica serovar Typhi, the causative agent of typhoid fever, and is thought to be responsible for the symptoms of severe disease. This toxin has a unique A2B5 architecture with two active subunits, the ADP ribosyl transferase PltA and the DNase CdtB, linked to a pentameric B subunit, which is alternatively made of...

    Xuyao Jiao, Sarah Smith, Gabrielle Stack, Qi Liang, Allan Bradley, Paul Kellam, Jorge E. Galán
  • Group A Streptococcus AdcR Regulon Participates in Bacterial Defense against Host-Mediated Zinc Sequestration and Contributes to Virulence
    Bacterial Infections
    Group A Streptococcus AdcR Regulon Participates in Bacterial Defense against Host-Mediated Zinc Sequestration and Contributes to Virulence

    Colonization by pathogenic bacteria depends on their ability to overcome host nutritional defenses and acquire nutrients. The human pathogen group A streptococcus (GAS) encounters the host defense factor calprotectin (CP) during infection. CP inhibits GAS growth in vitro by imposing zinc (Zn) limitation. However, GAS counterstrategies to combat CP-mediated Zn limitation and the in vivo relevance of CP-GAS interactions...

    Nishanth Makthal, Hackwon Do, Brian M. Wendel, Randall J. Olsen, John D. Helmann, James M. Musser, Muthiah Kumaraswami
  • For the Greater (Bacterial) Good: Heterogeneous Expression of Energetically Costly Virulence Factors
    Minireview
    For the Greater (Bacterial) Good: Heterogeneous Expression of Energetically Costly Virulence Factors

    Bacterial populations are phenotypically heterogeneous, which allows subsets of cells to survive and thrive following changes in environmental conditions. For bacterial pathogens, changes within the host environment occur over the course of the immune response to infection and can result in exposure to host-derived, secreted antimicrobials or force direct interactions with immune cells. Many recent studies have shown host cell...

    Kimberly M. Davis
  • EirA Is a Novel Protein Essential for Intracellular Replication of <span class="named-content genus-species" id="named-content-1">Coxiella burnetii</span>
    Molecular Pathogenesis
    EirA Is a Novel Protein Essential for Intracellular Replication of Coxiella burnetii

    The zoonotic bacterial pathogen Coxiella burnetii is the causative agent of Q fever, a febrile illness which can cause a serious chronic infection. C. burnetii is a unique intracellular bacterium which replicates within host lysosome-derived vacuoles. The ability of...

    Miku Kuba, Nitika Neha, Patrice Newton, Yi Wei Lee, Vicki Bennett-Wood, Abderrahman Hachani, David P. De Souza, Brunda Nijagal, Saravanan Dayalan, Dedreia Tull, Malcolm J. McConville, Fiona M. Sansom, Hayley J. Newton
  • The <em>scfCDE</em> Operon Encodes a Predicted ABC Importer Required for Fitness and Virulence during Group A <em>Streptococcus</em> Invasive Infection
    Molecular Pathogenesis
    The scfCDE Operon Encodes a Predicted ABC Importer Required for Fitness and Virulence during Group A Streptococcus Invasive Infection

    As a strict human pathogen, Streptococcus pyogenes (group A Streptococcus, or GAS) causes a wide range of infections, from superficial to life-threatening diseases, upon dissemination. Thus, it is necessary to gain a better understanding of how GAS successfully overcomes host-mediated challenges and infects various host niches.

    Rezia Era Braza, Yoann Le Breton, Kevin S. McIver
  • Open Access
    Pathogenic <span class="named-content genus-species" id="named-content-1">Mannheimia haemolytica</span> Invades Differentiated Bovine Airway Epithelial Cells
    Bacterial Infections
    Pathogenic Mannheimia haemolytica Invades Differentiated Bovine Airway Epithelial Cells

    The Gram-negative bacterium Mannheimia haemolytica is the primary bacterial species associated with bovine respiratory disease (BRD) and is responsible for significant economic losses to livestock industries worldwide. Healthy cattle are frequently colonized by commensal serotype A2 strains, but disease is usually caused by pathogenic strains of serotype A1.

    ...
    Daniel Cozens, Erin Sutherland, Miquel Lauder, Geraldine Taylor, Catherine C. Berry, Robert L. Davies
  • Molecular Pathogenesis
    RocA Is an Accessory Protein to the Virulence-Regulating CovRS Two-Component System in Group A Streptococcus
    Ira Jain, Eric W. Miller, Jessica L. Danger, Kathryn J. Pflughoeft, Paul Sumby
  • Free
    Bacterial Infections | Spotlight
    Propofol Sedation Exacerbates Kidney Pathology and Dissemination of Bacteria during Staphylococcus aureus Bloodstream Infections
    Lavanya Visvabharathy, Nancy E. Freitag

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