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bacteriophage

  • HK97 gp74 Possesses an α-Helical Insertion in the ββα Fold That Affects Its Metal Binding, <em>cos</em> Site Digestion, and <em>In Vivo</em> Activities
    Research Article
    HK97 gp74 Possesses an α-Helical Insertion in the ββα Fold That Affects Its Metal Binding, cos Site Digestion, and In Vivo Activities

    This study demonstrates that residues outside the canonical ββα fold, namely, the Ω-loop α-helical insert and a disordered C-terminal tail, regulate the activity of the HNH endonuclease gp74. The increased divalent metal ion binding when the Ω-loop insert is removed compared to reduced cos site digestion and phage formation indicates that the Ω-loop insert plays multiple regulatory roles. The data presented here provide...

    Sasha A. Weiditch, Sarah C. Bickers, Diane Bona, Karen L. Maxwell, Voula Kanelis
  • Open Access
    Dual Predation by Bacteriophage and <em>Bdellovibrio bacteriovorus</em> Can Eradicate <em>Escherichia coli</em> Prey in Situations where Single Predation Cannot
    Research Article | Spotlight
    Dual Predation by Bacteriophage and Bdellovibrio bacteriovorus Can Eradicate Escherichia coli Prey in Situations where Single Predation Cannot

    With increasing levels of antibiotic resistance, the development of alternative antibacterial therapies is urgently needed. Two potential alternatives are bacteriophage and predatory bacteria. Bacteriophage therapy has been used, but prey/host specificity and the rapid acquisition of bacterial resistance to bacteriophage are practical considerations. Predatory bacteria are of interest due to their broad Gram-negative bacterial prey...

    Laura Hobley, J. Kimberley Summers, Rob Till, David S. Milner, Robert J. Atterbury, Amy Stroud, Michael J. Capeness, Stephanie Gray, Andreas Leidenroth, Carey Lambert, Ian Connerton, Jamie Twycross, Michelle Baker, Jess Tyson, Jan-Ulrich Kreft, R. Elizabeth Sockett
  • Decoupling Filamentous Phage Uptake and Energy of the TolQRA Motor in <span class="named-content genus-species" id="named-content-1">Escherichia coli</span>
    Research Article
    Decoupling Filamentous Phage Uptake and Energy of the TolQRA Motor in Escherichia coli

    Filamentous phages are widely distributed symbionts of Gram-negative bacteria, with some of them being linked to genome evolution and virulence of their host. However, the precise mechanism that permits their uptake across the cell envelope is poorly understood. The canonical phage model Fd requires the TolQRA protein complex in the host envelope, which is suspected to translocate protons across the inner membrane. In this study, we...

    Poutoum Samire, Bastien Serrano, Denis Duché, Emeline Lemarié, Roland Lloubès, Laetitia Houot
  • Free
    Double Tubular Contractile Structure of the Type VI Secretion System Displays Striking Flexibility and Elasticity
    Research Article
    Double Tubular Contractile Structure of the Type VI Secretion System Displays Striking Flexibility and Elasticity

    The cell wall is a physical scaffold that all transenvelope complexes have to cross for assembly. However, the cell wall-deficient state has been described as a common condition found in both Gram-negative and Gram-positive pathogens during persistent infections. Loss of cell wall is known to have pleiotropic physiological effects, but how membrane-anchored large cellular organelles adapt to this unique state is less completely...

    Maria Silvina Stietz, Xiaoye Liang, Megan Wong, Steven Hersch, Tao G. Dong
  • Free
    PQS Produced by the <span class="named-content genus-species" id="named-content-1">Pseudomonas aeruginosa</span> Stress Response Repels Swarms Away from Bacteriophage and Antibiotics
    Research Article
    PQS Produced by the Pseudomonas aeruginosa Stress Response Repels Swarms Away from Bacteriophage and Antibiotics

    We uncover a phage- and antibiotic-induced stress response in the clinically important opportunistic pathogen Pseudomonas aeruginosa. Phage-infected P. aeruginosa subpopulations are isolated from uninfected subpopulations by the production of a stress-induced signal. Activation of the stress...

    Jean-Louis Bru, Brandon Rawson, Calvin Trinh, Katrine Whiteson, Nina Molin Høyland-Kroghsbo, Albert Siryaporn
  • Research Article
    A Bacteriophage Capsid Protein Is an Inhibitor of a Conserved Transcription Terminator of Various Bacterial Pathogens
    Gairika Ghosh, Jayavardhana Reddy, Susmit Sambhare, Ranjan Sen
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