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quorum sensing

  • Control of Competence in <span class="named-content genus-species" id="named-content-1">Vibrio fischeri</span>
    Genetics and Molecular Biology
    Control of Competence in Vibrio fischeri

    The ability of bacteria to take up DNA (competence) and incorporate foreign DNA into their genomes (transformation) permits them to rapidly evolve and gain new traits and/or acquire antibiotic resistances. It also facilitates laboratory-based investigations into mechanisms of specific phenotypes, such as those involved in host colonization. Vibrio fischeri has long...

    Joshua J. Cohen, Steven J. Eichinger, Danae A. Witte, Connor J. Cook, Pat M. Fidopiastis, Jovanka Tepavčević, Karen L. Visick
  • Signal Synthase-Type versus Catabolic Monooxygenases: Retracing 3-Hydroxylation of 2-Alkylquinolones and Their <em>N</em>-Oxides by <span class="named-content genus-species" id="named-content-1">Pseudomonas aeruginosa</span> and Other Pulmonary Pathogens
    Environmental Microbiology | Spotlight
    Signal Synthase-Type versus Catabolic Monooxygenases: Retracing 3-Hydroxylation of 2-Alkylquinolones and Their N-Oxides by Pseudomonas aeruginosa and Other Pulmonary Pathogens

    Pseudomonas aeruginosa, Staphylococcus aureus, and Mycobacteroides abscessus are major players in bacterial chronic infections and particularly common colonizers of cystic fibrosis (CF) lung tissue. Whereas...

    Niklas H. Ritzmann, Steffen L. Drees, Susanne Fetzner
  • Cyclic-di-GMP Regulates the Quorum-Sensing System and Biocontrol Activity of <span class="named-content genus-species" id="named-content-1">Pseudomonas fluorescens</span> 2P24 through the RsmA and RsmE Proteins
    Genetics and Molecular Biology
    Cyclic-di-GMP Regulates the Quorum-Sensing System and Biocontrol Activity of Pseudomonas fluorescens 2P24 through the RsmA and RsmE Proteins

    In various bacteria, the bacterial second messenger c-di-GMP influences a wide range of cellular processes. However, the function of c-di-GMP on biocontrol traits in the plant-beneficial rhizobacteria remains largely unclear. The present work shows that the QS system and polyketide antibiotic 2,4-DAPG production are regulated by c-di-GMP through RsmA and RsmE proteins in P....

    Fei Liang, Bo Zhang, Qingqing Yang, Yang Zhang, Dehong Zheng, Li-qun Zhang, Qing Yan, Xiaogang Wu
  • Multi-omics Approach Reveals How Yeast Extract Peptides Shape <span class="named-content genus-species" id="named-content-1">Streptococcus thermophilus</span> Metabolism
    Food Microbiology
    Multi-omics Approach Reveals How Yeast Extract Peptides Shape Streptococcus thermophilus Metabolism

    Improving the performance and industrial robustness of bacteria used in fermentations and food industry remains a challenge. We showed here that two Streptococcus thermophilus fermentations, performed with the same strain in media that differ only by their yeast extract compositions and, more especially, their peptide contents, led to similar growth kinetics and final...

    Lucas Proust, Eloi Haudebourg, Alain Sourabié, Martin Pedersen, Iris Besançon, Véronique Monnet, Vincent Juillard
  • Rap-Phr Systems from Plasmids pAW63 and pHT8-1 Act Together To Regulate Sporulation in the <span class="named-content genus-species" id="named-content-1">Bacillus thuringiensis</span> Serovar kurstaki HD73 Strain
    Invertebrate Microbiology
    Rap-Phr Systems from Plasmids pAW63 and pHT8-1 Act Together To Regulate Sporulation in the Bacillus thuringiensis Serovar kurstaki HD73 Strain

    The life cycle of Bacillus thuringiensis in insect larvae is regulated by quorum-sensing systems of the RNPP family. After the toxemia caused by Cry insecticidal toxins, the sequential activation of these systems allows the bacterium to trigger first a state of virulence (regulated by PlcR-PapR) and then a necrotrophic lifestyle (regulated by NprR-NprX); ultimately,...

    Priscilla Cardoso, Fernanda Fazion, Stéphane Perchat, Christophe Buisson, Gislayne Vilas-Bôas, Didier Lereclus
  • Species-Specific Quorum Sensing Represses the Chitobiose Utilization Locus in <span class="named-content genus-species" id="named-content-1">Vibrio cholerae</span>
    Genetics and Molecular Biology
    Species-Specific Quorum Sensing Represses the Chitobiose Utilization Locus in Vibrio cholerae

    In nature, bacteria live in multicellular and multispecies communities. Microbial species can sense the density and composition of their community through chemical cues using a process called quorum sensing (QS). The marine pathogen Vibrio cholerae is found in communities on the chitinous shells of crustaceans in its aquatic reservoir....

    Catherine A. Klancher, Jane D. Newman, Alyssa S. Ball, Julia C. van Kessel, Ankur B. Dalia
  • A Quorum Quenching Bacterial Isolate Contains Multiple Substrate-Inducible Genes Conferring Degradation of Diffusible Signal Factor
    Environmental Microbiology | Spotlight
    A Quorum Quenching Bacterial Isolate Contains Multiple Substrate-Inducible Genes Conferring Degradation of Diffusible Signal Factor

    Diffusible signal factor (DSF) represents a family of widely conserved quorum sensing signals involved in the regulation of virulence factor production in many Gram-negative bacterial pathogens. In this study, we developed a novel and efficient method for screening highly active DSF degradation microorganisms. With this method, we identified a bacterial isolate, Pseudomonas sp. strain HS-18, with a superb DSF degradation...

    Huishan Wang, Lisheng Liao, Shaohua Chen, Lian-Hui Zhang
  • Short-Chain <em>N</em>-Acylhomoserine Lactone Quorum-Sensing Molecules Promote Periodontal Pathogens in <em>In Vitro</em> Oral Biofilms
    Microbial Ecology
    Short-Chain N-Acylhomoserine Lactone Quorum-Sensing Molecules Promote Periodontal Pathogens in In Vitro Oral Biofilms

    Dental plaque is omnipresent in healthy oral cavities and part of our commensal microbial colonization. At the same time, dental plaque is the cause of the most common human diseases, caries and gum disease. Dental plaque consists of billions of microbes attached to the surface of your teeth. Communication among these microbes is pivotal for development of these complex communities yet poorly studied in dental plaque. In the present...

    Andrea Muras, Celia Mayer, Paz Otero-Casal, Rob A. M. Exterkate, Bernd W. Brandt, Wim Crielaard, Ana Otero, Bastiaan P. Krom
  • Effect of Quorum Sensing on the Ability of <em>Desulfovibrio vulgaris</em> To Form Biofilms and To Biocorrode Carbon Steel in Saline Conditions
    Geomicrobiology
    Effect of Quorum Sensing on the Ability of Desulfovibrio vulgaris To Form Biofilms and To Biocorrode Carbon Steel in Saline Conditions

    Sulfate-reducing bacteria (SRB) are considered key contributors to biocorrosion, particularly in saline environments. Biocorrosion imposes tremendous economic costs, and common approaches to mitigate this problem involve the use of toxic and hazardous chemicals (e.g., chlorine), which raise health and environmental safety concerns. Quorum-sensing inhibitors (QSIs) can be used as an alternative approach to inhibit biofilm formation and...

    Giantommaso Scarascia, Robert Lehmann, Laura L. Machuca, Christina Morris, Ka Yu Cheng, Anna Kaksonen, Pei-Ying Hong
  • Communication within East Antarctic Soil Bacteria
    Environmental Microbiology | Spotlight
    Communication within East Antarctic Soil Bacteria

    Quorum sensing, a type of bacterial communication, is widely known to regulate many processes, including those that confer a survival advantage. However, little is known about communication by bacteria residing within Antarctic soils. Employing a combination of bacterial biosensors, analytical techniques, and genome mining, we found a variety of Antarctic soil bacteria speaking a common language, via LuxI/LuxR-based quorum sensing, thus...

    Sin Yin Wong, James C. Charlesworth, Nicole Benaud, Brendan P. Burns, Belinda C. Ferrari

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