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Streptococcus

  • Open Access
    Commensal Oral <span class="named-content genus-species" id="named-content-1">Rothia mucilaginosa</span> Produces Enterobactin, a Metal-Chelating Siderophore
    Research Article | Host-Microbe Biology
    Commensal Oral Rothia mucilaginosa Produces Enterobactin, a Metal-Chelating Siderophore

    The communication language of the human oral microbiota is vastly underexplored. However, a few studies have shown that specialized small molecules encoded by BGCs have critical roles such as in colonization resistance against pathogens and quorum sensing. Here, by using a genome mining approach in combination with compound screening of growth cultures, we identified that the commensal oral community member R. mucilaginosa...

    Carla C. Uranga, Pablo Arroyo, Brendan M. Duggan, William H. Gerwick, Anna Edlund
  • Open Access
    Redox-Regulated Adaptation of <span class="named-content genus-species" id="named-content-1">Streptococcus oligofermentans</span> to Hydrogen Peroxide Stress
    Research Article | Molecular Biology and Physiology
    Redox-Regulated Adaptation of Streptococcus oligofermentans to Hydrogen Peroxide Stress

    The catalase-negative streptococci produce as well as tolerate high levels of H2O2. This work reports the molecular mechanisms of low-H2O2-concentration-induced adaptation to higher H2O2 stress in a Streptococcus species, in which the peroxide-responsive repressor PerR and its redox regulons play the major role. Distinct from the...

    Huichun Tong, Yuzhu Dong, Xinhui Wang, Qingqing Hu, Fan Yang, Meiqi Yi, Haiteng Deng, Xiuzhu Dong
  • Open Access
    Species Designations Belie Phenotypic and Genotypic Heterogeneity in Oral Streptococci
    Research Article | Host-Microbe Biology
    Species Designations Belie Phenotypic and Genotypic Heterogeneity in Oral Streptococci

    Representative type strains are commonly used to characterize bacterial species, yet species are phenotypically and genotypically heterogeneous. Conclusions about strain physiology and activity based on a single strain therefore may be inappropriate and misleading. When selecting strains for probiotic use, the assumption that all strains within a species share the same desired probiotic characteristics may result in selection of a...

    Irina M. Velsko, Brinta Chakraborty, Marcelle M. Nascimento, Robert A. Burne, Vincent P. Richards
  • Open Access
    Metabolic Fingerprints from the Human Oral Microbiome Reveal a Vast Knowledge Gap of Secreted Small Peptidic Molecules
    Editor's Pick Research Article | Host-Microbe Biology
    Metabolic Fingerprints from the Human Oral Microbiome Reveal a Vast Knowledge Gap of Secreted Small Peptidic Molecules

    Metabolomics is the ultimate tool for studies of microbial functions under any specific set of environmental conditions (D. S. Wishart, Nat Rev Drug Discov 45:473–484, 2016, https://doi.org/10.1038/nrd.2016.32 ). This is a great advance over studying genes alone, which only inform about metabolic potential. Approximately 25,000 compounds have been chemically characterized thus far;...

    Anna Edlund, Neha Garg, Hosein Mohimani, Alexey Gurevich, Xuesong He, Wenyuan Shi, Pieter C. Dorrestein, Jeffrey S. McLean
  • Open Access
    Comprehensive Transcriptome Profiles of <span class="named-content genus-species" id="named-content-1">Streptococcus mutans</span> UA159 Map Core Streptococcal Competence Genes
    Research Article | Molecular Biology and Physiology
    Comprehensive Transcriptome Profiles of Streptococcus mutans UA159 Map Core Streptococcal Competence Genes

    S. mutans has the hard surfaces of the oral cavity as its natural habitat, where it depends on its ability to form biofilms in order to survive. The comprehensive identification of S. mutans regulons activated in response to peptide pheromones provides an important basis for understanding how...

    R. Khan, H. V. Rukke, H. Høvik, H. A. Åmdal, T. Chen, D. A. Morrison, F. C. Petersen
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