-
Infection Control : IC Apr 1987
Review
Topics: Animals; Cross Infection; Humans; Pseudomonas; Pseudomonas Infections; Virulence
PubMed: 3294701
DOI: 10.1017/s019594170006584x -
Environmental Microbiology Jun 2010
Topics: History, 19th Century; History, 20th Century; History, 21st Century; Humans; Phylogeny; Pseudomonas
PubMed: 20553550
DOI: 10.1111/j.1462-2920.2009.02041.x -
Journal of Bacteriology Apr 2008
Topics: Adaptation, Physiological; Cell Communication; Gene Expression Regulation, Bacterial; Genetic Variation; Host-Pathogen Interactions; Humans; Protein Transport; Pseudomonas; Pseudomonas Infections; Signal Transduction
PubMed: 18165299
DOI: 10.1128/JB.01950-07 -
Trends in Microbiology Feb 2000
Topics: Animals; Biodegradation, Environmental; Biofilms; Biotechnology; Plants; Pseudomonas; Pseudomonas Infections; Virulence
PubMed: 10755833
DOI: 10.1016/s0966-842x(99)01671-6 -
Sheng Wu Gong Cheng Xue Bao = Chinese... Sep 2017Biofilms are surface-associated communities of microorganisms embedded within self-secreted extracellular polymeric substances, and a major cause of chronic and... (Review)
Review
Biofilms are surface-associated communities of microorganisms embedded within self-secreted extracellular polymeric substances, and a major cause of chronic and persistent infections. Respiratory Pseudomona aeruginosa infection is the leading reason for morbidity and mortality in cystic fibrosis patients. The formation of biofilms by P. aeruginosa in the airway is thought to increase persistence and antibiotic resistance during infection. Biofilm formation of P. aeruginosa is regulated by complicated signaling systems including quorum sensing and two-component systems that control the synthesis of extracellular polymeric substances. Furthermore, iron is an essential and scarce nutrient for bacteria and an important signal factor. P. aeruginosa has developed multiple iron uptake systems to sequester enough iron for its survival, with important regulatory roles in both release of virulence factors and formation of biofilms. In this review, we summarize recent advances in biofilm formation and its regulation along with the iron-uptake strategies in P. aeruginosa, to provide new insights and understanding to fight bacterial biofilms.
Topics: Biofilms; Cystic Fibrosis; Extracellular Polymeric Substance Matrix; Humans; Iron; Pseudomonas Infections; Pseudomonas aeruginosa; Quorum Sensing
PubMed: 28956396
DOI: 10.13345/j.cjb.170140 -
Environmental Microbiology Feb 1999
Review
Topics: DNA Transposable Elements; Forecasting; Mutation; Plant Diseases; Plant Roots; Pseudomonas
PubMed: 11207713
DOI: 10.1046/j.1462-2920.1999.00005.x -
Philosophical Transactions of the Royal... Jun 2004Plant-associated Pseudomonas live as saprophytes and parasites on plant surfaces and inside plant tissues. Many plant-associated Pseudomonas promote plant growth by... (Review)
Review
Plant-associated Pseudomonas live as saprophytes and parasites on plant surfaces and inside plant tissues. Many plant-associated Pseudomonas promote plant growth by suppressing pathogenic micro-organisms, synthesizing growth-stimulating plant hormones and promoting increased plant disease resistance. Others inhibit plant growth and cause disease symptoms ranging from rot and necrosis through to developmental dystrophies such as galls. It is not easy to draw a clear distinction between pathogenic and plant growth-promoting Pseudomonas. They colonize the same ecological niches and possess similar mechanisms for plant colonization. Pathogenic, saprophytic and plant growth-promoting strains are often found within the same species, and the incidence and severity of Pseudomonas diseases are affected by environmental factors and host-specific interactions. Plants are faced with the challenge of how to recognize and exclude pathogens that pose a genuine threat, while tolerating more benign organisms. This review examines Pseudomonas from a plant perspective, focusing in particular on the question of how plants perceive and are affected by saprophytic and plant growth-promoting Pseudomonas (PGPP), in contrast to their interactions with plant pathogenic Pseudomonas. A better understanding of the molecular basis of plant-PGPP interactions and of the key differences between pathogens and PGPP will enable researchers to make more informed decisions in designing integrated disease-control strategies and in selecting, modifying and using PGPP for plant growth promotion, bioremediation and biocontrol.
Topics: Immunity, Innate; Models, Biological; Plant Development; Plant Diseases; Plant Leaves; Plant Physiological Phenomena; Plant Roots; Plants; Pseudomonas; Symbiosis
PubMed: 15306406
DOI: 10.1098/rstb.2003.1384 -
FEMS Microbiology Reviews Mar 2006Bacteria use small signal molecules in order to monitor their population density and coordinate gene regulation in a process called quorum sensing. In Gram-negative... (Review)
Review
Bacteria use small signal molecules in order to monitor their population density and coordinate gene regulation in a process called quorum sensing. In Gram-negative bacteria, the most common signal molecules are acylated homoserine lactones. Several Pseudomonas species produce acylated homoserine lactones that control important functions including pathogenicity and plant growth promotion. Many reports indicate that the quorum sensing systems of Pseudomonas are significantly regulated and interconnected with regulons of other global regulators. The integration of quorum sensing into additional regulatory circuits increases the range of environmental and metabolic signals beyond that of cell density, as well as further tuning the timing of the response. This review will focus on the regulation of quorum sensing in Pseudomonas, highlighting a complex response that might serve a given species to adapt in its particular environment.
Topics: Bacterial Physiological Phenomena; Bacterial Proteins; Gene Expression Regulation, Bacterial; Pseudomonas; Pseudomonas aeruginosa; Signal Transduction
PubMed: 16472307
DOI: 10.1111/j.1574-6976.2005.00012.x -
FEMS Microbiology Reviews Jul 2014Membrane-spanning signaling pathways enable bacteria to alter gene expression in response to extracytoplasmic stimuli. Many such pathways are cell-surface signaling... (Review)
Review
Membrane-spanning signaling pathways enable bacteria to alter gene expression in response to extracytoplasmic stimuli. Many such pathways are cell-surface signaling (CSS) systems, which are tripartite molecular devices that allow Gram-negative bacteria to transduce an extracellular stimulus into a coordinated transcriptional response. Typically, CSS systems are composed of the following: (1) an outer membrane receptor, which senses the extracellular stimulus; (2) a cytoplasmic membrane-spanning protein involved in signal transduction from the periplasm to the cytoplasm; and (3) an extracytoplasmic function (ECF) sigma factor that initiates expression of the stimulus-responsive gene(s). Members of genus Pseudomonas provide a paradigmatic example of how CSS systems contribute to the global control of gene expression. Most CSS systems enable self-regulated uptake of iron via endogenous (pyoverdine) or exogenous (xenosiderophores, heme, and citrate) carriers. Some are also implicated in virulence, biofilm formation, and cell-cell interactions. Incorporating insights from the well-characterized alginate regulatory circuitry, this review will illustrate common themes and variations at the level of structural and functional properties of Pseudomonas CSS systems. Control of the expression and activity of ECF sigma factors are central to gene regulation via CSS, and the variety of intrinsic and extrinsic factors influencing these processes will be discussed.
Topics: Cell Membrane; Gene Expression Regulation, Bacterial; Iron; Pseudomonas; Sigma Factor; Signal Transduction; Stress, Physiological
PubMed: 24923658
DOI: 10.1111/1574-6976.12078 -
International Journal of Systematic and... Mar 2007The taxonomic position of Pseudomonas sp. B13(T), isolated as a 3-chlorobenzoate-degrading organism and used for several groundbreaking studies on the enzymology and...
The taxonomic position of Pseudomonas sp. B13(T), isolated as a 3-chlorobenzoate-degrading organism and used for several groundbreaking studies on the enzymology and genetics of the degradative pathway for haloaromatic compounds, was studied in detail. The previously performed physiological studies, the detection of ubiquinone Q-9, the polyamine pattern with putrescine and spermidine as major polyamines, a fatty acid profile with C(18 : 1)omega7c, summed feature 3 and C(16 : 0) as quantitatively the most important constituents and the 16S rRNA gene sequence demonstrated that Pseudomonas sp. B13(T) indeed belongs to the genus Pseudomonas. The sequence of the Pseudomonas sp. B13(T) 16S rRNA gene demonstrated a high degree of similarity with that of Pseudomonas citronellolis DSM 50332(T) (98.9 %), Pseudomonas nitroreducens DSM 14399(T) (98.7 %), Pseudomonas jinjuensis DSM 16612(T) (98.1 %) and Pseudomonas multiresinivorans DSM 17553(T) (98.7 %). Thus it was shown that strain Pseudomonas sp. B13(T) can be distinguished from related species by the ability/inability to assimilate N-acetylgalactosamine, d-galactose, putrescine, trans-aconitate and mesaconate and some differences in the fatty acid profile. The positioning of Pseudomonas sp. B13(T) as a separate taxon was finally verified by DNA hybridization, which demonstrated less than 45 % DNA-DNA similarity between strain Pseudomonas sp. B13(T) and the reference strains. On the basis of these results, Pseudomonas sp. B13(T) represents a novel species for which the name Pseudomonas knackmussii sp. nov. is proposed. The type strain is B13(T) (=DSM 6978(T)=LMG 23759(T)).
Topics: DNA, Bacterial; DNA, Ribosomal; Fatty Acids; Molecular Sequence Data; Pseudomonas; RNA, Ribosomal, 16S
PubMed: 17329787
DOI: 10.1099/ijs.0.64761-0