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Infection and Immunity
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Streptococcus pyogenes

  • A Role of Epithelial Cells and Virulence Factors in Biofilm Formation by <span class="named-content genus-species" id="named-content-1">Streptococcus pyogenes</span> <em>In Vitro</em>
    Host-Associated Microbial Communities
    A Role of Epithelial Cells and Virulence Factors in Biofilm Formation by Streptococcus pyogenes In Vitro

    Biofilm formation by Streptococcus pyogenes (group A streptococcus [GAS]) in model systems mimicking the respiratory tract is poorly documented. Most studies have been conducted on abiotic surfaces, which poorly represent human tissues. We have previously shown that GAS forms mature and antibiotic-resistant biofilms on physiologically relevant epithelial cells....

    Feiruz Alamiri, Yashuan Chao, Maria Baumgarten, Kristian Riesbeck, Anders P. Hakansson
  • Group A Streptococcus Infection of the Nasopharynx Requires Proinflammatory Signaling through the Interleukin-1 Receptor
    Host Response and Inflammation | Spotlight
    Group A Streptococcus Infection of the Nasopharynx Requires Proinflammatory Signaling through the Interleukin-1 Receptor

    Group A Streptococcus (GAS) is the etiologic agent of numerous high-morbidity and high-mortality diseases. Infections are typically highly proinflammatory. During the invasive infection necrotizing fasciitis, this is in part due to the GAS protease SpeB directly activating interleukin-1β (IL-1β) independent of the canonical inflammasome pathway. The upper respiratory tract is the primary site for GAS colonization, infection,...

    Doris L. LaRock, Raedeen Russell, Anders F. Johnson, Shyra Wilde, Christopher N. LaRock
  • Colonization of the Murine Oropharynx by <span class="named-content genus-species" id="named-content-1">Streptococcus pyogenes</span> Is Governed by the Rgg2/3 Quorum Sensing System
    Bacterial Infections
    Colonization of the Murine Oropharynx by Streptococcus pyogenes Is Governed by the Rgg2/3 Quorum Sensing System

    Streptococcus pyogenes is a human-restricted pathogen most often found in the human nasopharynx. Multiple bacterial factors are known to contribute to persistent colonization of this niche, and many are important in mucosal immunity and vaccine development. In this work, mice were infected intranasally with transcriptional regulator mutants of the Rgg2/3 quorum...

    Artemis Gogos, Michael J. Federle
  • The Second Messenger c-di-AMP Regulates Diverse Cellular Pathways Involved in Stress Response, Biofilm Formation, Cell Wall Homeostasis, SpeB Expression, and Virulence in <span class="named-content genus-species" id="named-content-1">Streptococcus pyogenes</span>
    Molecular Pathogenesis
    The Second Messenger c-di-AMP Regulates Diverse Cellular Pathways Involved in Stress Response, Biofilm Formation, Cell Wall Homeostasis, SpeB Expression, and Virulence in Streptococcus pyogenes

    Cyclic di-AMP (c-di-AMP) is a recently discovered second messenger in bacteria. The cellular level of c-di-AMP in Streptococcus pyogenes is predicted to be controlled by the synthase DacA and two putative phosphodiesterases, GdpP and Pde2.

    Tazin Fahmi, Sabrina Faozia, Gary C. Port, Kyu Hong Cho
  • Bacterial Infections
    New Insights into the Role of Zinc Acquisition and Zinc Tolerance in Group A Streptococcal Infection
    Cheryl-lynn Y. Ong, Olga Berking, Mark J. Walker, Alastair G. McEwan
  • Molecular Pathogenesis
    Identification and Characterization of Serotype-Specific Variation in Group A Streptococcus Pilus Expression
    Gregory Calfee, Jessica L. Danger, Ira Jain, Eric W. Miller, Poulomee Sarkar, Brian Tjaden, Bernd Kreikemeyer, Paul Sumby
  • Molecular Pathogenesis
    Requirement and Synergistic Contribution of Platelet-Activating Factor Acetylhydrolase Sse and Streptolysin S to Inhibition of Neutrophil Recruitment and Systemic Infection by Hypervirulent emm3 Group A Streptococcus in Subcutaneous Infection of Mice
    Wenchao Feng, Dylan Minor, Mengyao Liu, Benfang Lei
  • Bacterial Infections
    Incremental Contributions of FbaA and Other Impetigo-Associated Surface Proteins to Fitness and Virulence of a Classical Group A Streptococcal Skin Strain
    Candace N. Rouchon, Anhphan T. Ly, John P. Noto, Feng Luo, Sergio Lizano, Debra E. Bessen
  • 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
    The PerR-Regulated P1B-4-Type ATPase (PmtA) Acts as a Ferrous Iron Efflux Pump in Streptococcus pyogenes
    Andrew G. Turner, Cheryl-lynn Y. Ong, Karrera Y. Djoko, Nicholas P. West, Mark R. Davies, Alastair G. McEwan, Mark J. Walker

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