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Pseudomonas

  • Open Access
    Tumble Suppression Is a Conserved Feature of Swarming Motility
    Observation | Molecular Biology and Physiology
    Tumble Suppression Is a Conserved Feature of Swarming Motility

    Bacteria within a swarm move characteristically in packs, displaying an intricate swirling motion in which hundreds of dynamic rafts continuously form and dissociate as the swarm colonizes an increasing expanse of territory. The demonstrated property of E. coli to reduce its tumble bias and hence increase its run duration during swarming is expected to maintain and...

    Jonathan D. Partridge, Nguyen T. Q. Nhu, Yann S. Dufour, Rasika M. Harshey
  • Open Access
    Comparative Genomics Identified a Genetic Locus in Plant-Associated <em>Pseudomonas</em> spp. That Is Necessary for Induced Systemic Susceptibility
    Research Article | Host-Microbe Biology
    Comparative Genomics Identified a Genetic Locus in Plant-Associated Pseudomonas spp. That Is Necessary for Induced Systemic Susceptibility

    Microbiome-associated bacteria can have diverse effects on health of their hosts, yet the genetic and molecular bases of these effects have largely remained elusive. This work demonstrates that a novel bacterial locus can modulate systemic plant immunity. Additionally, this work demonstrates that growth-promoting strains may have unanticipated consequences for plant immunity, and this is critical to consider when the plant microbiome is...

    Polina Beskrovnaya, Ryan A. Melnyk, Zhexian Liu, Yang Liu, Melanie A. Higgins, Yi Song, Katherine S. Ryan, Cara H. Haney
  • Open Access
    A Genus Definition for <em>Bacteria</em> and <em>Archaea</em> Based on a Standard Genome Relatedness Index
    Editor's Pick Research Article | Ecological and Evolutionary Science
    A Genus Definition for Bacteria and Archaea Based on a Standard Genome Relatedness Index

    In recent decades, the taxonomy of Bacteria and Archaea, and therefore genus designation, has been largely based on the use of a single ribosomal gene, the 16S rRNA gene, as a taxonomic marker. We propose an approach to delineate genera that excludes the direct use of the 16S rRNA gene and focuses on a standard genome relatedness index, the average nucleotide identity. Our findings are of importance to the microbiology...

    R. A. Barco, G. M. Garrity, J. J. Scott, J. P. Amend, K. H. Nealson, D. Emerson
  • Open Access
    Regulatory Mechanism of Nicotine Degradation in <em>Pseudomonas putida</em>
    Research Article | Molecular Biology and Physiology
    Regulatory Mechanism of Nicotine Degradation in Pseudomonas putida

    We report the entire process underlying the NicR2 regulatory mechanism from association between free NicR2 and two promoters to dissociation of the NicR2-promoter complex. NicR2 can bind to another promoter, Pspm, which controls expression of nicotine-degrading genes that are not controlled by the Phsp promoter. We identified specific nucleotides of the Pspm promoter responsible for NicR2 binding. HSP was...

    Haiyang Hu, Lijuan Wang, Weiwei Wang, Geng Wu, Fei Tao, Ping Xu, Zixin Deng, Hongzhi Tang
  • Open Access
    Is the Potable Water System an Advantageous Preinfection Niche for Bacteria Colonizing the Cystic Fibrosis Lung?
    Opinion/Hypothesis | Host-Microbe Biology
    Is the Potable Water System an Advantageous Preinfection Niche for Bacteria Colonizing the Cystic Fibrosis Lung?

    People with cystic fibrosis are susceptible to lung infections from a variety of bacteria, a number of which also reside in the potable water system, including Pseudomonas aeruginosa, Stenotrophomonas maltophilia, Achromobacter...

    Matthew J. Wargo
  • Open Access
    Temperature, by Controlling Growth Rate, Regulates CRISPR-Cas Activity in <span class="named-content genus-species" id="named-content-1">Pseudomonas aeruginosa</span>
    Research Article | Molecular Biology and Physiology
    Temperature, by Controlling Growth Rate, Regulates CRISPR-Cas Activity in Pseudomonas aeruginosa

    P. aeruginosa is a soil dwelling bacterium and a plant pathogen, and it also causes life-threatening infections in humans. Thus, P. aeruginosa thrives in diverse environments and over a broad range of temperatures. Some P. aeruginosa...

    Nina Molin Høyland-Kroghsbo, Katrina Arcelia Muñoz, Bonnie L. Bassler
  • Open Access
    A Genome-Wide Screen Identifies Genes in Rhizosphere-Associated <em>Pseudomonas</em> Required to Evade Plant Defenses
    Research Article | Host-Microbe Biology
    A Genome-Wide Screen Identifies Genes in Rhizosphere-Associated Pseudomonas Required to Evade Plant Defenses

    While rhizosphere bacteria hold the potential to improve plant health and fitness, little is known about the bacterial genes required to evade host immunity. Using a model system consisting of Arabidopsis and a beneficial Pseudomonas sp. isolate, we identified bacterial genes required for both rhizosphere fitness and for evading host immune responses. This work advances our understanding of how evasion of host defenses...

    Zhexian Liu, Polina Beskrovnaya, Ryan A. Melnyk, Sarzana S. Hossain, Sophie Khorasani, Lucy R. O’Sullivan, Christina L. Wiesmann, Jen Bush, Joël D. Richard, Cara H. Haney
  • Open Access
    Who's Your DadA? <span class="sc">d</span>-Alanine Levels Regulate Bacterial Stiffness
    Commentary | Molecular Biology and Physiology
    Who's Your DadA? d-Alanine Levels Regulate Bacterial Stiffness

    A central question in mechanobiology is how cellular-scale structures are established and regulated. In bacteria, the cell envelope is essential for mechanical integrity, protecting against environmental stresses and bearing the load from high turgor pressures.

    Pascal D. Odermatt, Heidi A. Arjes, Fred Chang, Kerwyn Casey Huang
  • Open Access
    Research Article
    Metagenomes Reveal Global Distribution of Bacterial Steroid Catabolism in Natural, Engineered, and Host Environments

    Microbial steroid degradation is a critical process for biomass decomposition in natural environments, for removal of important pollutants during wastewater treatment, and for pathogenesis of bacteria associated with tuberculosis and other bacteria. To date, microbial steroid degradation was mainly studied in a few model organisms, while the ecological significance of steroid degradation remained largely unexplored. This study provides...

    Johannes Holert, Erick Cardenas, Lee H. Bergstrand, Elena Zaikova, Aria S. Hahn, Steven J. Hallam, William W. Mohn
  • Open Access
    Research Article
    Secondary Metabolism and Interspecific Competition Affect Accumulation of Spontaneous Mutants in the GacS-GacA Regulatory System in Pseudomonas protegens
    Qing Yan, Lucas D. Lopes, Brenda T. Shaffer, Teresa A. Kidarsa, Oliver Vining, Benjamin Philmus, Chunxu Song, Virginia O. Stockwell, Jos M. Raaijmakers, Kerry L. McPhail, Fernando D. Andreote, Jeff H. Chang, Joyce E. Loper

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