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https://www.readbyqxmd.com/read/28204863/influence-of-twitching-and-swarming-motilities-on-biofilm-formation-in-pseudomonas-strains
#1
Letícia Muner Otton, Marina da Silva Campos, Karine Lena Meneghetti, Gertrudes Corção
The genus Pseudomonas mainly includes opportunistic pathogens that rely on type IV pili as an important virulence factor, which is associated with adherence and biofilm formation. Pseudomonas infections are well known to be persistent and resilient in nature largely because of the tendency of the species to form biofilms. This study aimed at analyzing environmental strains of Pseudomonas genus with respect to their ability to execute twitching and swarming motilities as well as with respect to their ability to form biofilms both in the presence as well as in the absence of furanone, a substance that has the potential to prevent the formation of biofilms...
February 15, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28194138/phenotypic-microdiversity-and-phylogenetic-signal-analysis-of-traits-related-to-social-interaction-in-bacillus-spp-from-sediment-communities
#2
Dolores María Rodríguez-Torres, África Islas-Robles, Zulema Gómez-Lunar, Luis Delaye, Ismael Hernández-González, Valeria Souza, Michael Travisano, Gabriela Olmedo-Álvarez
Understanding the relationship between phylogeny and predicted traits is important to uncover the dimension of the predictive power of a microbial composition approach. Numerous works have addressed the taxonomic composition of bacteria in communities, but little is known about trait heterogeneity in closely related bacteria that co-occur in communities. We evaluated a sample of 467 isolates from the Churince water system of the Cuatro Cienegas Basin (CCB), enriched for Bacillus spp. The 16S rRNA gene revealed a random distribution of taxonomic groups within this genus among 11 sampling sites...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28188589/synergistic-activity-of-sub-inhibitory-concentrations-of-curcumin-with-ceftazidime-and-ciprofloxacin-against-pseudomonas-aeruginosa-quorum-sensing-related-genes-and-virulence-traits
#3
Shekoufeh Roudashti, Habib Zeighami, Hesam Mirshahabi, Shahin Bahari, Ali Soltani, Fakhri Haghi
Quorum sensing (QS) system in Pseudomonas aeruginosa may be an important target for pharmacological intervention. The present study aimed to investigate the synergetic activity of sub-MIC concentrations of curcumin (C) with ceftazidime (CAZ) and ciprofloxacin (CIP) against P. aeroginusa QS system. We determined the MIC and synergistic activity of C, CAZ and CIP against P. aeroginusa PAO1 using broth microdilution and checkerboard titration methods. The activity of sub-MIC (1/4 and 1/16 MIC) concentrations of C on the QS signal molecules was assessed using a reporter strain assay...
March 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28174308/bacillus-subtilis-swarmer-cells-lead-the-swarm-multiply-and-generate-a-trail-of-quiescent-descendants
#4
Lina Hamouche, Soumaya Laalami, Adrian Daerr, Solène Song, I Barry Holland, Simone J Séror, Kassem Hamze, Harald Putzer
: Bacteria adopt social behavior to expand into new territory, led by specialized swarmers, before forming a biofilm. Such mass migration of Bacillus subtilis on a synthetic medium produces hyperbranching dendrites that transiently (equivalent to 4 to 5 generations of growth) maintain a cellular monolayer over long distances, greatly facilitating single-cell gene expression analysis. Paradoxically, while cells in the dendrites (nonswarmers) might be expected to grow exponentially, the rate of swarm expansion is constant, suggesting that some cells are not multiplying...
February 7, 2017: MBio
https://www.readbyqxmd.com/read/28167523/the-role-of-cyclic-di-gmp-and-exopolysaccharide-in-type-iv-pilus-dynamics
#5
Jan Ribbe, Amy E Baker, Sebstian Euler, George A O'Toole, Berenike Maier
For Pseudomonas aeruginosa the levels of cyclic di-GMP govern the transition from the planktonic state to biofilm formation. Type IV pili (T4P) are crucial determinants of biofilm structure and dynamics, but it is unknown how the levels of c-di-GMP affect pilus dynamics. Here, we scrutinized how c-di-GMP affects molecular motor properties and adhesive behavior of T4P. By means of retraction, T4P generated forces of ∼ 30 pN. Deletion mutants in the proteins with known roles in biofilm formation, swarming motility and exopolysaccharide (EPS) production, specifically, the diguanulate cyclases sadC and roeA or the c-di-GMP phosphodiesterase bifA, showed only modest effects on velocity or force of T4P retraction...
February 6, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28166091/oral-polyphosphate-suppresses-bacterial-collagenase-production-and-prevents-anastomotic-leak-due-to-serratia-marcescens-and-pseudomonas-aeruginosa
#6
Sanjiv K Hyoju, Robin E Klabbers, Melissa Aaron, Monika A Krezalek, Alexander Zaborin, Mara Wiegerinck, Neil H Hyman, Olga Zaborina, Harry Van Goor, John C Alverdy
OBJECTIVE: The objective of this study was to determine the effect of polyphosphate on intestinal bacterial collagenase production and anastomotic leak in mice undergoing colon surgery. BACKGROUND: We have previously shown that anastomotic leak can be caused by intestinal pathogens that produce collagenase. Because bacteria harbor sensory systems to detect the extracellular concentration of phosphate which controls their virulence, we tested whether local phosphate administration in the form of polyphosphate could attenuate pathogen virulence and prevent leak without affecting bacterial growth...
February 3, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28150465/impact-of-ph-regulation-on-multi-copper-oxidase-production-and-swarming-motility-in-the-bacterium-proteus-hauseri-zmd44
#7
Chang Su, Zhiyang Chen, I-Son Ng
Proteus hauseri ZMd44, a biodecolorizing bacterium, has been known to produce electricity and multi-copper oxidase (Mco-laccase) under copper induction. However, optimization and regulation of production have not been explored. This study is the first attempt to evaluate several parameters on biomass and Mco-laccase production of P. hauseri ZMd44. Through orthogonal experiments with Taguchi's L9 found that P. hauseri ZMd44 was sensitive to pH value. The cells grew relatively quickly at pH 7, thus the biomass and Mco-laccase-production reached 1...
February 1, 2017: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/28149169/anti-quorum-sensing-and-anti-biofilm-activity-of-amomum-tsaoko-amommum-tsao-ko-crevost-et-lemarie-on-foodborne-pathogens
#8
Md Ramim Tanver Rahman, Zaixiang Lou, Fuhao Yu, Peng Wang, Hongxin Wang
Cell-to-cell communication or quorum sensing (QS) leads to biofilm formation and causing other virulence factors which are extreme problems for food safety, biofilm related infectious diseases etc. This study evaluated the anti-QS activity of the Amomum tsaoko extract (0.5-4 mg/ml) by using Chromobacterium violaceum a biosensor strain and biofilm formation by crystal violate assay. Experimental results demonstrated that the overall yield of Amomum tsao-ko extract was 11.33 ± 0.3% (w/w). MIC for Staphylococcus aureus (Gram positive), Salmonella Typhimurium and Pseudomonas aeruginosa (Gram negative) was 1, 2 and 2 mg/ml, respectively...
February 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28138423/achromobacter-xylosoxidans-infection-in-cystic-fibrosis-siblings-with-different-outcomes-case-reports
#9
Mônica Cássia Firmida, Elizabeth Andrade Marques, Robson Souza Leão, Rosana Helena Vicente Pereira, Elenice Rosa Aguiar Rodrigues, Rodolpho Mattos Albano, Tania Wrobel Folescu, Vagner Bernardo, Pedro Daltro, Domenico Capone, Agnaldo José Lopes
INTRODUCTION: The clinical relevance of Achromobacter xylosoxidans infection in cystic fibrosis (CF) remains controversial. This emerging agent in CF has been associated with increased lung inflammation, more frequent exacerbations and more severe lung disease. We describe a pair of CF siblings chronically colonized by the same multilocus genotype of A. xylosoxidans with different clinical courses, and assess whether this species may have developed any virulence traits and antimicrobial resistance that could have contributed to their singular outcomes...
2017: Respiratory Medicine Case Reports
https://www.readbyqxmd.com/read/28127379/antibiofilm-and-antioxidant-activity-of-propolis-and-bud-poplar-resins-versus-pseudomonas-aeruginosa
#10
Stefania De Marco, Miranda Piccioni, Rita Pagiotti, Donatella Pietrella
Pseudomonas aeruginosa is a common biofilm-forming bacterial pathogen implicated in lung, skin, and systemic infections. Biofilms are majorly associated with chronic lung infection, which is the most severe complication in cystic fibrosis patients characterized by drug-resistant biofilms in the bronchial mucus with zones, where reactive oxygen species concentration is increased mainly due to neutrophil activity. Aim of this work is to verify the anti-Pseudomonas property of propolis or bud poplar resins extracts...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28117457/the-aliphatic-amidase-amie-is-involved-in-regulation-of-pseudomonas-aeruginosa-virulence
#11
Thomas Clamens, Thibaut Rosay, Alexandre Crépin, Teddy Grandjean, Takfarinas Kentache, Julie Hardouin, Perrine Bortolotti, Anke Neidig, Marlies Mooij, Mélanie Hillion, Julien Vieillard, Pascal Cosette, Joerg Overhage, Fergal O'Gara, Emeline Bouffartigues, Alain Dufour, Sylvie Chevalier, Benoit Guery, Pierre Cornelis, Marc G J Feuilloley, Olivier Lesouhaitier
We have previously shown that the eukaryotic C-type natriuretic peptide hormone (CNP) regulates Pseudomonas aeruginosa virulence and biofilm formation after binding on the AmiC sensor, triggering the amiE transcription. Herein, the involvement of the aliphatic amidase AmiE in P. aeruginosa virulence regulation has been investigated. The proteome analysis of an AmiE over-producing strain (AmiE(+)) revealed an expression change for 138 proteins, including some that are involved in motility, synthesis of quorum sensing compounds and virulence regulation...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28117390/growth-rate-control-of-flagellar-assembly-in-escherichia-coli-strain-rp437
#12
Martin Sim, Santosh Koirala, David Picton, Henrik Strahl, Paul A Hoskisson, Christopher V Rao, Colin S Gillespie, Phillip D Aldridge
The flagellum is a rotary motor that enables bacteria to swim in liquids and swarm over surfaces. Numerous global regulators control flagellar assembly in response to cellular and environmental factors. Previous studies have also shown that flagellar assembly is affected by the growth-rate of the cell. However, a systematic study has not yet been described under controlled growth conditions. Here, we investigated the effect of growth rate on flagellar assembly in Escherichia coli using steady-state chemostat cultures where we could precisely control the cell growth-rate...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28114301/weak-synchronization-and-large-scale-collective-oscillation-in-dense-bacterial-suspensions
#13
Chong Chen, Song Liu, Xia-Qing Shi, Hugues Chaté, Yilin Wu
Collective oscillatory behaviour is ubiquitous in nature, having a vital role in many biological processes from embryogenesis and organ development to pace-making in neuron networks. Elucidating the mechanisms that give rise to synchronization is essential to the understanding of biological self-organization. Collective oscillations in biological multicellular systems often arise from long-range coupling mediated by diffusive chemicals, by electrochemical mechanisms, or by biomechanical interaction between cells and their physical environment...
February 9, 2017: Nature
https://www.readbyqxmd.com/read/28100305/environment-directed-activation-the-escherichia-coli-flhdc-operon-by-transposons
#14
Zhongge Zhang, Chika Kukita, Mir Zafri Humayun, Milton H Saier
The flagellar system in E. coli K12 is expressed under the control of the flhDC-encoded master regulator, FlhDC. Transposition of insertion sequence (IS) elements to the upstream flhDC promoter region up-regulates transcription of this operon, resulting in more rapid motility. Wang and Wood (2011) provided evidence that insertion of IS5 into upstream activating sites occurs at higher rates in semisolid agar media in which swarming behavior is allowed as compared with liquid or solid media where swarming cannot occur...
January 17, 2017: Microbiology
https://www.readbyqxmd.com/read/28091933/flagellar-regulation-and-virulence-in-the-entomopathogenic-bacteria-xenorhabdus-nematophila-and-photorhabdus-luminescens
#15
Alain Givaudan, Anne Lanois
There is a complex interplay between the regulation of flagellar motility and the expression of virulence factors in many bacterial pathogens. Here, we review the literature on the direct and indirect roles of flagellar motility in mediating the tripartite interaction between entomopathogenic bacteria (Photorhabdus and Xenorhabdus), their nematode hosts, and their insect targets. First, we describe the swimming and swarming motility of insect pathogenic bacteria and its impact on insect colonization. Then, we describe the coupling between the expression of flagellar and virulence genes and the dynamic of expression of the flagellar regulon during invertebrate infection...
December 28, 2016: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/28065820/bioavailability-enhanced-resveramax%C3%A2-modulates-quorum-sensing-and-inhibits-biofilm-formation-in-pseudomonas-aeruginosa-pao1
#16
H S Vasavi, H V Sudeep, H B Lingaraju, K Shyam Prasad
Quorum sensing (QS), a cell-to-cell communication mechanism present in many bacterial species plays a key role in regulating the virulence factor and biofilm formation in many pathogens, which causes severe public health risk. Therefore, interfering with QS mechanism offers an attractive strategy to combat bacterial infections. In the present study, anti-QS activity of a novel resveratrol formulation, Resveramax™, was detected using Chromobacterium violaceum biosensor bioassay and the effect of Resveramax on QS-regulated phenotypes in Pseudomonas aeruginosa PAO1 was assessed by standard protocols...
January 5, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28056789/evolutionary-diversification-of-pseudomonas-aeruginosa-in-an-artificial-sputum-model
#17
Emily V Davies, Chloe E James, Michael A Brockhurst, Craig Winstanley
BACKGROUND: During chronic lung infections of cystic fibrosis patients Pseudomonas aeruginosa populations undergo extensive evolutionary diversification. However, the selective drivers of this evolutionary process are poorly understood. To test the effects of temperate phages on diversification in P. aeruginosa biofilms we experimentally evolved populations of P. aeruginosa for approximately 240 generations in artificial sputum medium with or without a community of three temperate phages...
January 5, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28046014/pseudomonas-aeruginosa-sera-gene-is-required-for-bacterial-translocation-through-caco-2-cell-monolayers
#18
Masashi Yasuda, Syouya Nagata, Satoshi Yamane, Chinami Kunikata, Yutaka Kida, Koichi Kuwano, Chigusa Suezawa, Jun Okuda
To specify critical factors responsible for Pseudomonas aeruginosa penetration through the Caco-2 cell epithelial barrier, we analyzed transposon insertion mutants that demonstrated a dramatic reduction in penetration activity relative to P. aeruginosa PAO1 strain. From these strains, mutations could be grouped into five classes, specifically flagellin-associated genes, pili-associated genes, heat-shock protein genes, genes related to the glycolytic pathway, and biosynthesis-related genes. Of these mutants, we here focused on the serA mutant, as the association between this gene and penetration activity is yet unknown...
2017: PloS One
https://www.readbyqxmd.com/read/28036241/suppressor-analysis-of-eepr-mutant-defects-reveals-coordinate-regulation-of-secondary-metabolites-and-serralysin-biosynthesis-by-eepr-and-hexs
#19
Robert M Q Shanks, Nicholas A Stella, Roni M Lahr, Marissa A Aston, Kimberly M Brothers, Jake Callaghan, Cihad Sigindere, Xinyu Liu
The EepR transcription factor positively regulates secondary metabolites and tissue damaging metalloproteases. To gain insight into mechanisms by which EepR regulates pigment and co-regulated factors, genetic suppressor analysis was performed. Suppressor mutations that restored pigment to the non-pigmented ∆eepR mutant mapped to the hexS open reading frame. Mutation of hexS also restored hemolysis, swarming motility, and protease production to the eepR mutant. HexS is a known direct and negative regulator of secondary metabolites in S...
December 30, 2016: Microbiology
https://www.readbyqxmd.com/read/28008851/functional-dichotomy-and-distinct-nanoscale-assemblies-of-a-cell-cycle-controlled-bipolar-zinc-finger-regulator
#20
Johann Mignolet, Seamus Holden, Matthieu Bergé, Gaël Panis, Ezgi Eroglu, Laurence Théraulaz, Suliana Manley, Patrick H Viollier
Protein polarization underlies differentiation in metazoans and in bacteria. How symmetric polarization can instate functional asymmetry remains elusive. Here, we show by super-resolution photo-activated localization microscopy and edgetic mutations that the bitopic zinc-finger protein ZitP implements specialized developmental functions - pilus biogenesis and multifactorial swarming motility - while shaping distinct nanoscale (bi)polar architectures in the asymmetric model bacterium Caulobacter crescentus. Polar assemblage and accumulation of ZitP and its effector protein CpaM are orchestrated in time and space by conserved components of the cell cycle circuitry that coordinate polar morphogenesis with cell cycle progression, and also act on the master cell cycle regulator CtrA...
December 23, 2016: ELife
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