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pH

  • Open Access
    RocA Regulates Phosphatase Activity of Virulence Sensor CovS of Group A <em>Streptococcus</em> in Growth Phase- and pH-Dependent Manners
    Research Article | Molecular Biology and Physiology
    RocA Regulates Phosphatase Activity of Virulence Sensor CovS of Group A Streptococcus in Growth Phase- and pH-Dependent Manners

    The emergence of invasive group A streptococcal infections has been reported worldwide. Clinical isolates that have spontaneous mutations or a truncated allele of the rocA gene (e.g., emm3-type isolates) are considered to be more virulent than isolates with the intact rocA gene (e.g., emm1-type isolates). RocA is a positive regulator of covR and has been shown to enhance the phosphorylation...

    Chuan Chiang-Ni, He-Jing Chiou, Huei-Chuan Tseng, Chih-Yun Hsu, Cheng-Hsun Chiu
  • Open Access
    <span class="named-content genus-species" id="named-content-1">Saccharomyces cerevisiae</span>: First Steps to a Suitable Model System To Study the Function and Intracellular Transport of Human Kidney Anion Exchanger 1
    Research Article | Molecular Biology and Physiology
    Saccharomyces cerevisiae: First Steps to a Suitable Model System To Study the Function and Intracellular Transport of Human Kidney Anion Exchanger 1

    Distal renal tubular acidosis (dRTA) is a common kidney dysfunction characterized by impaired acid secretion via urine. Previous studies revealed that α-intercalated cells of dRTA patients express mutated forms of human kidney anion exchanger 1 (kAE1) which result in inefficient plasma membrane targeting or diminished expression levels of kAE1. However, the precise dRTA-causing processes are inadequately understood, and alternative...

    Hasib A. M. Sarder, Xiaobing Li, Charlotta Funaya, Emmanuelle Cordat, Manfred J. Schmitt, Björn Becker
  • Open Access
    <span class="named-content genus-species" id="named-content-1">Candida albicans</span> Impacts <span class="named-content genus-species" id="named-content-2">Staphylococcus aureus</span> Alpha-Toxin Production via Extracellular Alkalinization
    Research Article | Host-Microbe Biology
    Candida albicans Impacts Staphylococcus aureus Alpha-Toxin Production via Extracellular Alkalinization

    Candida albicans and Staphylococcus aureus are commonly coisolated from central venous catheters and deep-seated infections, including intra-abdominal sepsis. Thus, they represent a significant cause of nosocomial morbidity and mortality. Yet how these organisms behave in the context of...

    Olivia A. Todd, Mairi C. Noverr, Brian M. Peters
  • Open Access
    Spatial and Temporal Analysis of the Stomach and Small-Intestinal Microbiota in Fasted Healthy Humans
    Research Article | Host-Microbe Biology
    Spatial and Temporal Analysis of the Stomach and Small-Intestinal Microbiota in Fasted Healthy Humans

    The gut microbiota are linked to a variety of gastrointestinal diseases, including inflammatory bowel disease. Despite this importance, microbiota dynamics in the upper gastrointestinal tract are understudied. Our article seeks to understand what factors impact microbiota dynamics in the healthy human upper gut. We found that the upper gastrointestinal tract contains consistently prevalent bacterial OTUs that dominate the overall...

    Anna M. Seekatz, Matthew K. Schnizlein, Mark J. Koenigsknecht, Jason R. Baker, William L. Hasler, Barry E. Bleske, Vincent B. Young, Duxin Sun
  • Open Access
    The Capsule of <span class="named-content genus-species" id="named-content-1">Cryptococcus neoformans</span> Modulates Phagosomal pH through Its Acid-Base Properties
    Research Article | Host-Microbe Biology
    The Capsule of Cryptococcus neoformans Modulates Phagosomal pH through Its Acid-Base Properties

    Cryptococcus neoformans is the causative agent of cryptococcosis, a devastating fungal disease that affects thousands of individuals worldwide. This fungus has the capacity to survive inside phagocytic cells, which contributes to persistence of infection and dissemination. One of the major antimicrobial mechanisms of host phagocytes is to acidify the phagosomal...

    Carlos M. De Leon-Rodriguez, Man Shun Fu, M. Osman Çorbali, Radames J. B. Cordero, Arturo Casadevall
  • Open Access
    Hiding in Plain Sight: Mining Bacterial Species Records for Phenotypic Trait Information
    Research Article | Ecological and Evolutionary Science
    Hiding in Plain Sight: Mining Bacterial Species Records for Phenotypic Trait Information

    Cultivation in the laboratory is key for understanding the phenotypic characteristics, growth requirements, metabolism, and environmental preferences of bacteria. However, oftentimes, phenotypic information is not easily accessible. Here, we compiled phenotypic and environmental tolerance information for >5,000 bacterial strains described in the International Journal of Systematic and Evolutionary Microbiology (IJSEM). We...

    Albert Barberán, Hildamarie Caceres Velazquez, Stuart Jones, Noah Fierer
  • Open Access
    Global Role of Cyclic AMP Signaling in pH-Dependent Responses in <span class="named-content genus-species" id="named-content-1">Candida albicans</span>
    Research Article | Molecular Biology and Physiology
    Global Role of Cyclic AMP Signaling in pH-Dependent Responses in Candida albicans

    Candida albicans is a human commensal and the causative agent of candidiasis, a potentially invasive and life-threatening infection. C. albicans experiences wide changes in pH during both benign commensalism (a common condition) and pathogenesis, and its morphology changes in response to this...

    Jeffrey M. Hollomon, Nora Grahl, Sven D. Willger, Katja Koeppen, Deborah A. Hogan
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