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biofilm and burkholderia

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https://www.readbyqxmd.com/read/29146260/a-novel-burkholderia-ambifaria-strain-able-to-degrade-the-mycotoxin-fusaric-acid-and-to-inhibit-fusarium-spp-growth
#1
Ester Simonetti, Irma N Roberts, Marcela S Montecchia, Flavio H Gutierrez-Boem, Federico M Gomez, Jimena A Ruiz
Fusaric acid (FA) is a fungal metabolite produced by several Fusarium species responsible for wilts and root rot diseases of a great variety of plants. Bacillus spp. and Pseudomonas spp. have been considered as promising biocontrol agents against phytopathogenic Fusarium spp., however it has been demonstrated that FA negatively affects growth and production of some antibiotics in these bacteria. Thus, the capability to degrade FA would be a desirable characteristic in bacterial biocontrol agents of Fusarium wilt...
January 2018: Microbiological Research
https://www.readbyqxmd.com/read/29145795/use-of-immunohistochemistry-to-demonstrate-in-vivo-expression-of-the-burkholderia-mallei-virulence-factor-bpab-during-experimental-glanders
#2
Shawn M Zimmerman, Mackenzie E Long, Jeremy S Dyke, Tomislav P Jelesijevic, Frank Michel, Eric R Lafontaine, Robert J Hogan
Burkholderia mallei causes the highly contagious and debilitating zoonosis glanders, which infects via inhalation or percutaneous inoculation and often culminates in life-threatening pneumonia and sepsis. In humans, glanders is difficult to diagnose and requires prolonged antibiotic therapy with low success rates. No vaccine exists to protect against B. mallei, and there is concern regarding its use as a bioweapon. The authors previously identified the protein BpaB as a potential target for devising therapies due to its role in adherence to host cells and the formation of biofilms in vitro and its contribution to pathogenicity in a mouse model of glanders...
January 1, 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/29142288/identification-of-small-rnas-abundant-in-burkholderia-cenocepacia-biofilms-reveal-putative-regulators-with-a-potential-role-in-carbon-and-iron-metabolism
#3
Andrea Sass, Sanne Kiekens, Tom Coenye
Small RNAs play a regulatory role in many central metabolic processes of bacteria, as well as in developmental processes such as biofilm formation. Small RNAs of Burkholderia cenocepacia, an opportunistic pathogenic beta-proteobacterium, are to date not well characterised. To address that, we performed genome-wide transcriptome structure analysis of biofilm grown B. cenocepacia J2315. 41 unannotated short transcripts were identified in intergenic regions of the B. cenocepacia genome. 15 of these short transcripts, highly abundant in biofilms, widely conserved in Burkholderia sp...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29056926/highly-diversified-pandoraea-pulmonicola-population-during-chronic-colonization-in-cystic-fibrosis
#4
Chloé Dupont, Fabien Aujoulat, Raphaël Chiron, Pauline Condom, Estelle Jumas-Bilak, Hélène Marchandin
Several environmental bacteria are considered as opportunistic pathogens in cystic fibrosis (CF) and are able to persistently colonize the CF respiratory tract (CFRT). Beside Pseudomonas aeruginosa and Burkholderia cepacia complex, Pandoraea spp. are defined as pathogenic. During chronic colonization, adaptive evolution and diversified population have been demonstrated, notably for P. aeruginosa. However, the persistence of Pandoraea in the CFRT remains largely unexplored. We studied genomic and phenotypic traits of Pandoraea pulmonicola isolates successively recovered from the airways of a single CF patient and relate the results to qualitative and quantitative evolution of other cultivable pathogens and to patient clinical status...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29022243/pyrosequencing-analysis-of-source-water-switch-and-sulfate-induced-bacterial-community-transformation-in-simulated-drinking-water-distribution-pipes
#5
Fan Yang, Baoyou Shi, Weiyu Zhang, Jing Cui, Jianbo Guo, Dongsheng Wang, Nan Wu, Xinyuan Liu
Inter-basin water transfer and source water switching will be increasingly launched due to significant population increase and the shortage of the local water resources in cities around the world. Source water switch may cause physiochemical and microbiological de-stabilization of pipe material, biofilms, and loose deposits in drinking water distribution system (DWDS). Great sulfate alteration during source water switch had been deemed as the main cause of a red water case that occurred in a northern China city...
October 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28965656/effects-of-binge-alcohol-exposure-on-burkholderia-thailandensis-alveolar-macrophage-interaction
#6
Victor Jimenez, Ryan Moreno, Emily Kaufman, Heidie Hornstra, Erik Settles, Bart J Currie, Paul Keim, Fernando P Monroy
Alcohol consumption has diverse and well-documented effects on the human immune system and its ability to defend against infective agents. One example is melioidosis, a disease caused by infection with Burkholderia pseudomallei, which is of public health importance in Southeast Asia and Northern Australia, with an expanding global distribution. While B. pseudomallei infections can occur in healthy humans, binge alcohol use is progressively being recognized as a major risk factor. Although binge alcohol consumption has been considered as a risk factor for the development of melioidosis, no experimental studies have investigated the outcomes of alcohol exposure on Burkholderia spp...
November 2017: Alcohol
https://www.readbyqxmd.com/read/28956352/mutation-of-the-cyclic-di-gmp-phosphodiesterase-gene-in-burkholderia-lata-sk875-attenuates-virulence-and-enhances-biofilm-formation
#7
Hae-In Jung, Yun-Jung Kim, Yun-Jung Lee, Hee-Soo Lee, Jung-Kee Lee, Soo-Ki Kim
Burkholderia sp. is a gram-negative bacterium that commonly exists in the environment, and can cause diseases in plants, animals, and humans. Here, a transposon mutant library of a Burkholderia lata isolate from a pig with swine respiratory disease in Korea was screened for strains showing attenuated virulence in Caenorhabditis elegans. One such mutant was obtained, and the Tn5 insertion junction was mapped to rpfR, a gene encoding a cyclic di-GMP phosphodiesterase that functions as a receptor. Mutation of rpfR caused a reduction in growth on CPG agar and swimming motility as well as a rough colony morphology on Congo red agar...
October 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28859314/the-role-of-multispecies-social-interactions-in-shaping-pseudomonas-aeruginosa-pathogenicity-in-the-cystic-fibrosis-lung
#8
Siobhán O'Brien, Joanne L Fothergill
Pseudomonas aeruginosa is a major pathogen in the lungs of cystic fibrosis (CF) patients. However, it is now recognised that a diverse microbial community exists in the airways comprising aerobic and anaerobic bacteria as well as fungi and viruses. This rich soup of microorganisms provides ample opportunity for interspecies interactions, particularly when considering secreted compounds. Here, we discuss how P. aeruginosa-secreted products can have community-wide effects, with the potential to ultimately shape microbial community dynamics within the lung...
August 15, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28790983/nitrate-sensing-and-metabolism-inhibit-biofilm-formation-in-the-opportunistic-pathogen-burkholderia-pseudomallei-by-reducing-the-intracellular-concentration-of-c-di-gmp
#9
Mihnea R Mangalea, Brooke A Plumley, Bradley R Borlee
The opportunistic pathogen Burkholderia pseudomallei is a saprophytic bacterium and the causative agent of melioidosis, an emerging infectious disease associated with high morbidity and mortality. Although melioidosis is most prevalent during the rainy season in endemic areas, domestic gardens and farms can also serve as a reservoir for B. pseudomallei during the dry season, in part due to irrigation and fertilizer use. In the environment, B. pseudomallei forms biofilms and persists in soil near plant root zones...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28756196/inhibition-of-bacterial-biofilms-by-carboxymethyl-chitosan-combined-with-silver-zinc-and-copper-salts
#10
Randys Caldeira Gonçalves, Diego Pereira da Silva, Roberta Signini, Plínio Lázaro Faleiro Naves
Investigation of the antimicrobial action of carboxymethyl chitosan (CMCh) is among the alternative approaches in the control of pathogenic microorganisms. This study aimed to screen the toxicity using the brine shrimp lethality assay and to investigate the inhibitory activity of carboxymethyl in isolation or in combination with silver nitrate, copper sulfate and zinc sulfate on biofilm formation by Staphylococcus aureus ATCC 6538, Staphylococcus epidermidis ATCC 12228, Kocuria rhizophila ATCC 9341, Pseudomonas aeruginosa ATCC 9027, Escherichia coli ATCC 25312, and Burkholderia cepacia ATCC 17759...
December 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28733286/regulator-ldhr-and-d-lactate-dehydrogenase-ldha-of-burkholderia-multivorans-play-roles-in-carbon-overflow-and-in-planktonic-cellular-aggregate-formation
#11
Inês N Silva, Marcelo J Ramires, Lisa A Azevedo, Ana R Guerreiro, Andreia C Tavares, Jörg D Becker, Leonilde M Moreira
LysR-type transcriptional regulators (LTTRs) are the most commonly found regulators in Burkholderia cepacia complex, comprising opportunistic pathogens causing chronic respiratory infections in cystic fibrosis (CF) patients. Despite LTTRs being global regulators of pathogenicity in several types of bacteria, few have been characterized in Burkholderia Here, we show that gene ldhR of B. multivorans encoding an LTTR is cotranscribed with ldhA encoding a d-lactate dehydrogenase and evaluate their implication in virulence traits such as exopolysaccharide (EPS) synthesis and biofilm formation...
October 1, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28658258/genome-scale-analysis-of-the-genes-that-contribute-to-burkholderia-pseudomallei-biofilm-formation-identifies-a-crucial-exopolysaccharide-biosynthesis-gene-cluster
#12
Grace I Borlee, Brooke A Plumley, Kevin H Martin, Nawarat Somprasong, Mihnea R Mangalea, M Nurul Islam, Mary N Burtnick, Paul J Brett, Ivo Steinmetz, David P AuCoin, John T Belisle, Dean C Crick, Herbert P Schweizer, Bradley R Borlee
Burkholderia pseudomallei, the causative agent of melioidosis, is an important public health threat due to limited therapeutic options for treatment. Efforts to improve therapeutics for B. pseudomallei infections are dependent on the need to understand the role of B. pseudomallei biofilm formation and its contribution to antibiotic tolerance and persistence as these are bacterial traits that prevent effective therapy. In order to reveal the genes that regulate and/or contribute to B. pseudomallei 1026b biofilm formation, we screened a sequence defined two-allele transposon library and identified 118 transposon insertion mutants that were deficient in biofilm formation...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28651010/macrophages-but-not-neutrophils-are-critical-for-proliferation-of-burkholderia-cenocepacia-and-ensuing-host-damaging-inflammation
#13
Jennifer Mesureur, Joana R Feliciano, Nelly Wagner, Margarida C Gomes, Lili Zhang, Monica Blanco-Gonzalez, Michiel van der Vaart, David O'Callaghan, Annemarie H Meijer, Annette C Vergunst
Bacteria of the Burkholderia cepacia complex (Bcc) can cause devastating pulmonary infections in cystic fibrosis (CF) patients, yet the precise mechanisms underlying inflammation, recurrent exacerbations and transition from chronic stages to acute infection and septicemia are not known. Bcc bacteria are generally believed to have a predominant extracellular biofilm life style in infected CF lungs, similar to Pseudomonas aeruginosa, but this has been challenged by clinical observations which show Bcc bacteria predominantly in macrophages...
June 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28643413/effects-of-sodium-chloride-on-heat-resistance-oxidative-susceptibility-motility-biofilm-and-plaque-formation-of-burkholderia-pseudomallei
#14
Pornpan Pumirat, Muthita Vanaporn, Usa Boonyuen, Nitaya Indrawattana, Amporn Rungruengkitkun, Narisara Chantratita
Burkholderia pseudomallei is an environmental saprophyte and the causative agent of melioidosis, a severe infectious disease prevalent in tropical areas, including southeast Asia and northern Australia. In Thailand, the highest incidence of melioidosis is in the northeast region, where saline soil and water are abundant. We hypothesized that B. pseudomallei develops an ability to thrive in saline conditions and gains a selective ecological advantage over other soil-dwelling microorganisms. However, little is known about how an elevated NaCl concentration affects survival and adaptive changes in this pathogen...
August 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28593045/virulence-traits-associated-with-burkholderia-cenocepacia-st856-epidemic-strain-isolated-from-cystic-fibrosis-patients
#15
Milka Malešević, Zorica Vasiljević, Aleksandar Sovtić, Brankica Filipić, Katarina Novović, Milan Kojić, Branko Jovčić
BACKGROUND: Burkholderia cenocepacia is considered one of the most problematic cystic fibrosis (CF) pathogens. Colonization prevalence in the Serbian CF population is high and virtually exclusively limited to a single highly transmissible clone of B. cenocepacia ST856 which is positive for both the B. cepacia epidemic strain marker (BCESM) and cable pilin, and is closely related to the epidemic strain CZ1 (ST32). METHODS: Biofilm formation for 182 isolates, and adhesion to components of the host extracellular matrix, proteolytic activity, mucoidy and motility of selected ST856 representatives, as well as B...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28468829/fluorescence-and-nmr-spectroscopy-together-with-molecular-simulations-reveal-amphiphilic-characteristics-of-a-burkholderia-biofilm-exopolysaccharide
#16
Michelle M Kuttel, Paola Cescutti, Marco Distefano, Roberto Rizzo
Biofilms are a collective mode of bacterial life in which a self-produced matrix confines cells in close proximity to each other. Biofilms confer many advantages, including protection from chemicals (including antibiotics), entrapment of useful extracellular enzymes and nutrients, as well as opportunities for efficient recycling of molecules from dead cells. Biofilm matrices are aqueous gel-like structures composed of polysaccharides, proteins, and DNA stabilized by intermolecular interactions that may include non-polar connections...
June 30, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28463102/high-intracellular-c-di-gmp-levels-antagonize-quorum-sensing-and-virulence-gene-expression-in-burkholderia-cenocepacia-h111
#17
Nadine Schmid, Angela Suppiger, Elisabeth Steiner, Gabriella Pessi, Volkhard Kaever, Mustafa Fazli, Tim Tolker-Nielsen, Urs Jenal, Leo Eberl
The opportunistic human pathogen Burkholderia cenocepacia H111 uses two chemically distinct signal molecules for controlling gene expression in a cell density-dependent manner: N-acyl-homoserine lactones (AHLs) and cis-2-dodecenoic acid (BDSF). Binding of BDSF to its cognate receptor RpfR lowers the intracellular c-di-GMP level, which in turn leads to differential expression of target genes. In this study we analysed the transcriptional profile of B. cenocepacia H111 upon artificially altering the cellular c-di-GMP level...
May 2017: Microbiology
https://www.readbyqxmd.com/read/28419759/regulation-of-burkholderia%C3%A2-cenocepacia-biofilm-formation-by-rpon-and-the-c-di-gmp-effector-berb
#18
Mustafa Fazli, Morten Rybtke, Elisabeth Steiner, Elisabeth Weidel, Jens Berthelsen, Julie Groizeleau, Wu Bin, Boo Zhao Zhi, Zhang Yaming, Volkhard Kaever, Michael Givskov, Rolf W Hartmann, Leo Eberl, Tim Tolker-Nielsen
Knowledge about the molecular mechanisms that are involved in the regulation of biofilm formation is essential for the development of biofilm-control measures. It is well established that the nucleotide second messenger cyclic diguanosine monophosphate (c-di-GMP) is a positive regulator of biofilm formation in many bacteria, but more knowledge about c-di-GMP effectors is needed. We provide evidence that c-di-GMP, the alternative sigma factor RpoN (σ54), and the enhancer-binding protein BerB play a role in biofilm formation of Burkholderia cenocepacia by regulating the production of a biofilm-stabilizing exopolysaccharide...
August 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28407432/diagnosis-of-biofilm-infections-in-cystic-fibrosis-patients
#19
REVIEW
Niels Høiby, Thomas Bjarnsholt, Claus Moser, Peter Østrup Jensen, Mette Kolpen, Tavs Qvist, Kasper Aanaes, Tanja Pressler, Marianne Skov, Oana Ciofu
Chronic Pseudomonas aeruginosa biofilm lung infection in cystic fibrosis patients is the best described biofilm infection in medicine. The initial focus can be the paranasal sinuses and then follows repeated colonization and infection of the lungs by aspiration. The matrix of the biofilms is dominated by alginate and the pathogenesis of tissue damage is immune complex-mediated chronic inflammation dominated by polymorphonuclear leukocytes and their products (DNA, oxygen radicals and proteases). The P. aeruginosa biofilm infection can be diagnosed by microscopy of lung tissue, sputum and mucus from the paranasal sinuses, where aggregates of the bacteria are found surrounded by the abundant alginate matrix...
April 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28406615/redox-sensitive-marr-homologue-bifr-from-burkholderia-thailandensis-regulates-biofilm-formation
#20
Ashish Gupta, Stanley M Fuentes, Anne Grove
Biofilm formation by pathogenic Burkholderia species is a serious complication as it renders the bacteria resistant to antibiotics and host defenses. Using B. thailandensis, we report here a novel redox-sensitive member of the multiple antibiotic resistance regulator (MarR) protein family, BifR, which represses biofilm formation. BifR is encoded as part of the emrB-bifR operon; emrB-bifR is divergent to ecsC, which encodes a putative LasA protease. In Pseudomonas aeruginosa, LasA has been implicated in virulence by contributing to cleavage of elastase...
May 2, 2017: Biochemistry
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