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https://www.readbyqxmd.com/read/28631419/the-cpxr-cpxa-system-contributes-to-salmonella-gold-resistance-by-controlling-the-gols-dependent-gesabc-transcription
#1
Sebastián Cerminati, Germán F Giri, Julián I Mendoza, Fernando C Soncini, Susana K Checa
Several regulatory systems contribute to bacterial resistance to heavy metals controlling the expression of factors required to eliminate the intoxicant and/or to repair the damage caused by it. In Salmonella, the response to Au ions is mediated by the specific metalloregulator GolS that, among other genes, controls the expression of the RND-efflux pump GesABC. In this work, we demonstrate that CpxR/CpxA, a main cell-envelope stress-responding system, promotes gesABC transcription in the presence of Au ions at neutral pH...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28629077/effects-of-the-surface-modification-of-polyurethane-substrates-on-genotoxicity-and-blood-activation-processes
#2
Roman Major, Hanna Plutecka, Anna Gruszczynska, Juergen M Lackner, Boguslaw Major
The aim of this study was to determine the mutagenic and thrombogenic potential of a material composed of a thin coating deposited on a polymeric substrate. In this work, a surface was modified in a manner that would mimic the function of cellular niches. Finally, the surfaces should actively capture and differentiate progenitor cells from the blood stream. Thin films with 10 to 500nm thicknesses were deposited by unbalanced, pulsed DC magnetron sputtering on smooth polyurethane. Such high energy conditions led to a stiffening of the polymer surface layers by pseudodiffusion during the initial stages of film growth...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28611217/rna-target-profiles-direct-the-discovery-of-virulence-functions-for-the-cold-shock-proteins-cspc-and-cspe
#3
Charlotte Michaux, Erik Holmqvist, Erin Vasicek, Malvika Sharan, Lars Barquist, Alexander J Westermann, John S Gunn, Jörg Vogel
The functions of many bacterial RNA-binding proteins remain obscure because of a lack of knowledge of their cellular ligands. Although well-studied cold-shock protein A (CspA) family members are induced and function at low temperature, others are highly expressed in infection-relevant conditions. Here, we have profiled transcripts bound in vivo by the CspA family members of Salmonella enterica serovar Typhimurium to link the constitutively expressed CspC and CspE proteins with virulence pathways. Phenotypic assays in vitro demonstrated a crucial role for these proteins in membrane stress, motility, and biofilm formation...
June 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28604692/oxidation-of-phosphorothioate-dna-modifications-leads-to-lethal-genomic-instability
#4
Stefanie Kellner, Michael S DeMott, Ching Pin Cheng, Brandon S Russell, Bo Cao, Delin You, Peter C Dedon
Genomic modification by sulfur in the form of phosphorothioate (PT) is widespread among prokaryotes, including human pathogens. Apart from its physiological functions, PT sulfur has redox and nucleophilic properties that suggest effects on bacterial fitness in stressful environments. Here we show that PTs are dynamic and labile DNA modifications that cause genomic instability during oxidative stress. In experiments involving isotopic labeling coupled with mass spectrometry, we observed sulfur replacement in PTs at a rate of ∼2% h(-1) in unstressed Escherichia coli and Salmonella enterica...
June 12, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28593349/transcriptomic-analysis-of-the-swarm-motility-phenotype-of-salmonella-enterica-serovar-typhimurium-mutant-defective-in-periplasmic-glucan-synthesis
#5
Arvind A Bhagwat, Lynn Young, Allen D Smith, Medha Bhagwat
Movement of food-borne pathogens on moist surfaces enables them to migrate towards more favorable niches and facilitate their survival for extended periods of time. Salmonella enterica serovar Typhimurium mutants defective in Osmoregulated periplasmic glucans (OPG) synthesis are unable to exhibit motility on moist surfaces (swarming); however, their mobility in liquid (swim motility) remains unaffected. In order to understand the role of OPG in swarm motility, transcriptomic analysis was performed using cells growing on a moist agar surface...
June 8, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28588134/the-rcs-regulated-colanic-acid-capsule-maintains-membrane-potential-in-salmonella-enterica-serovar-typhimurium
#6
Jasmine M Pando, Joyce E Karlinsey, Jimmie C Lara, Stephen J Libby, Ferric C Fang
The Rcs phosphorelay and Psp (phage shock protein) systems are envelope stress responses that are highly conserved in gammaproteobacteria. The Rcs regulon was found to be strongly induced during metal deprivation of Salmonella enterica serovar Typhimurium lacking the Psp response. Nineteen genes activated by the RcsA-RcsB response regulator make up an operon responsible for the production of colanic acid capsular polysaccharide, which promotes biofilm development. Despite more than half a century of research, the physiological function of colanic acid has remained elusive...
June 6, 2017: MBio
https://www.readbyqxmd.com/read/28573217/antibacterial-and-antioxidant-potential-of-stem-bark-extract-of-bombax-ceiba-collected-locally-from-south-punjab-area-of-pakistan
#7
Masood-Ur-Rehman, Naveed Akhtar, Rehan Mustafa
BACKGROUND: Ethnic medication systems have been used extensively by humans since their origin. Now a day, in the developing countries these systems are being used due to their effectiveness and affordability. Especially inhabitants of rural areas still rely on these systems as first line of treatment against diseased conditions. Till now, majority of medicines is derived from the natural origin particularly plants owing to their little side effects and cost effectiveness. MATERIALS AND METHODS: In the present work, we evaluated antibacterial and antioxidant activity of methanolic extract of Bombax ceiba stem bark...
2017: African Journal of Traditional, Complementary, and Alternative Medicines: AJTCAM
https://www.readbyqxmd.com/read/28553268/global-gene-expression-analysis-of-the-response-of-salmonella-enteritidis-to-egg-white-exposure-reveals-multiple-egg-white-imposed-stress-responses
#8
Florence Baron, Sylvie Bonnassie, Mariah Alabdeh, Marie-Françoise Cochet, Françoise Nau, Catherine Guérin-Dubiard, Michel Gautier, Simon C Andrews, Sophie Jan
Chicken egg white protects the embryo from bacterial invaders by presenting an assortment of antagonistic activities that combine together to both kill and inhibit growth. The key features of the egg white anti-bacterial system are iron restriction, high pH, antibacterial peptides and proteins, and viscosity. Salmonella enterica serovar Enteritidis is the major pathogen responsible for egg-borne infection in humans, which is partly explained by its exceptional capacity for survival under the harsh conditions encountered within egg white...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28552524/resveratrol-induces-membrane-and-dna-disruption-via-pro-oxidant-activity-against-salmonella-typhimurium
#9
Wonjong Lee, Dong Gun Lee
Resveratrol is a flavonoid found in various plants including grapes, which has been reported to be active against various pathogenic bacteria. However, antibacterial effects and mechanisms via pro-oxidant property of resveratrol remain unknown and speculative. This research investigated antibacterial mechanism of resveratrol against a food-borne human pathogen Salmonella typhimurium, and confirmed the cell death associated oxidative damage. Resveratrol increased outer membrane permeability and membrane depolarization...
May 25, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28542593/lack-of-the-pga-exopolysaccharide-in-salmonella-as-an-adaptive-trait-for-survival-in-the-host
#10
Maite Echeverz, Begoña García, Amaia Sabalza, Jaione Valle, Toni Gabaldón, Cristina Solano, Iñigo Lasa
Many bacteria build biofilm matrices using a conserved exopolysaccharide named PGA or PNAG (poly-β-1,6-N-acetyl-D-glucosamine). Interestingly, while E. coli and other members of the family Enterobacteriaceae encode the pgaABCD operon responsible for PGA synthesis, Salmonella lacks it. The evolutionary force driving this difference remains to be determined. Here, we report that Salmonella lost the pgaABCD operon after the divergence of Salmonella and Citrobacter clades, and previous to the diversification of the currently sequenced Salmonella strains...
May 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28539708/assessment-of-mexican-arnica-heterotheca-inuloides-cass-and-rosemary-rosmarinus-officinalis-extracts-on-dopamine-and-selected-biomarkers-of-oxidative-stress-in-stomach-and-brain-of-salmonella-typhimurium-infected-rats
#11
David Calderón Guzmàn, Maribel Ortiz Herrera, Norma Osnaya Brizuela, Gerardo Barragàn Mejía, Ernestina Hernàndez García, Hugo Juàrez Olguín, Armando Valenzuela Peraza, Norma Labra Ruíz, Daniel Santamaría Del Angel
BACKGROUND: The effects of some natural products on dopamine (DA) and 5-hydroxyindole acetic acid (5-HIAA) in brain of infected models are still unclear. OBJECTIVE: The purpose of this study was to measure the effect of Mexican arnica/rosemary (MAR) water extract and oseltamivir on both biogenic amines and some oxidative biomarkers in the brain and stomach of young rats under infection condition. METHODS: Female Wistar rats (weight 80 g) in the presence of MAR or absence (no-MAR) were treated as follows: group 1, buffer solution (controls); oseltamivir (100 mg/kg), group 2; culture of Salmonella typhimurium (S...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28538155/structure-and-intermolecular-interactions-between-l-type-straight-flagellar-filaments
#12
Daniel Louzon, Avi Ginsburg, Walter Schwenger, Tom Dvir, Zvonimir Dogic, Uri Raviv
Bacterial mobility is powered by rotation of helical flagellar filaments driven by rotary motors. Flagellin isolated from the Salmonella Typhimurium SJW1660 strain, which differs by a point mutation from the wild-type strain, assembles into straight filaments in which flagellin monomers are arranged in a left-handed helix. Using small-angle x-ray scattering and osmotic stress methods, we investigated the structure of SJW1660 flagellar filaments as well as the intermolecular forces that govern their assembly into dense hexagonal bundles...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28526786/impact-of-acanthamoeba-cysts-on-stress-resistance-of-salmonella-enterica-serovar-typhimurium-yersinia-enterocolitica-4-o-3-listeria-monocytogenes-1-2a-and-escherichia-coli-o-26
#13
Ellen Lambrecht, Julie Baré, Koen Sabbe, Kurt Houf
The formation of robust resting cysts enables Acanthamoeba to resist harsh environmental conditions. This study investigated to what extent these cysts are resistant to physical and chemical stresses as applied in food industry cleaning and disinfection procedures. Moreover it was assessed whether certain intracystic meatborne bacterial pathogens are more stress-resistant than free-living bacterial monocultures and if intracystic passage and subsequent association with trophozoites induces cross-tolerance towards other stressors...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28522802/proteome-remodelling-by-the-stress-sigma-factor-rpos-%C3%AF-s-in-salmonella-identification-of-small-proteins-and-evidence-for-post-transcriptional-regulation
#14
Magali Lago, Véronique Monteil, Thibaut Douche, Julien Guglielmini, Alexis Criscuolo, Corinne Maufrais, Mariette Matondo, Françoise Norel
The RpoS/σ(S) sigma subunit of RNA polymerase is the master regulator of the general stress response in many Gram-negative bacteria. Extensive studies have been conducted on σ(S)-regulated gene expression at the transcriptional level. In contrast, very limited information regarding the impact of σ(S) on global protein production is available. In this study, we used a mass spectrometry-based proteomics approach to explore the wide σ(S)-dependent proteome of the human pathogen Salmonella enterica serovar Typhimurium...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28512466/salinity-stress-does-not-affect-root-uptake-dissemination-and-persistence-of-salmonella-in-sweet-basil-ocimum-basilicum
#15
Nirit Bernstein, Shlomo Sela Saldinger, Nativ Dudai, Elena Gorbatsevich
Crop produce can be contaminated in the field during cultivation by bacterial human pathogens originating from contaminated soil or irrigation water. The bacterial pathogens interact with the plant, can penetrate the plant via the root system and translocate and survive in above-ground tissues. The present study is first to investigate effects of an abiotic stress, salinity, on the interaction of plants with a bacterial human pathogen. The main sources of human bacterial contamination of plants are manures and marginal irrigation waters such as treated or un-treated wastewater...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28505496/inactivation-of-gram-bacteria-salmonella-enterica-by-chlorophyllin-based-photosensitization-mechanism-of-action-and-new-strategies-to-enhance-the-inactivation-efficiency
#16
Irina Buchovec, Viktorija Lukseviciūtė, Rita Kokstaite, Danute Labeikyte, Laura Kaziukonyte, Zivile Luksiene
This study is focused on the enhancement of susceptibility of Gram (-) bacteria S. enterica to chlorophyllin-based (Chl) photosensitization combining it with other antimicrobial tools. In order to find best combinations, the mechanism by which Chl-based photosensitization inactivates bacteria must be identified. Data confirmed that photosensitization (Chl 1.5×10(-5)M, for 1-120min, 405nm, 0-46.1J/cm(2)) reduced S. enterica population, just by 2.05 log (CFU/ml). Fluorimetric measurements indicated that just minor part of Chl was bound to Salmonella in suspension...
May 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28470089/contribution-of-the-csga-and-bcsa-genes-to-salmonella-enterica-serovar-pullorum-biofilm-formation-and-virulence
#17
Muhanad El Hag, Zheng Feng, Yangyang Su, Xiao Wang, Afrah Yassin, Sujuan Chen, Daxin Peng, Xiufan Liu
Salmonella biofilm formation is important to environmental stress resistance and virulence. However, the roles of the csgA and bcsA genes, which affect curli protein and cellulose production, respectively, in Salmonella enterica serovar Pullorum, are unknown. Here we constructed deletions in the csgA and bcsA genes in S. enterica serovar Pullorum strain S6702 and evaluated several aspects of biofilm formation and virulence. ΔcsgA showed decreased production of curli fimbriae, while ΔbcsA had reduced cellulose production...
June 5, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28461448/the-response-to-2-aminoacrylate-differs-in-e-coli-and-s-enterica-despite-shared-metabolic-components
#18
Andrew J Borchert, Diana M Downs
The metabolic network of an organism includes the sum total of the biochemical reactions present. In microbes, this network has an impeccable ability to sense and respond to perturbations caused by internal or external stimuli. The metabolic potential (i.e, network structure) of an organism is often drawn from the genome sequence, based on the presence of enzymes deemed to indicate specific pathways. Escherichia coli and Salmonella enterica are members of the Enterobacteriaceae family of Gram-negative bacteria that share the majority of their metabolic components and regulatory machinery as the "core genome"...
May 1, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28455137/influence-of-static-magnetic-field-exposure-on-fatty-acid-composition-in-salmonella-hadar
#19
Ramla Ben Mouhoub, Alya El May, Imed Cheraief, Ahmed Landoulsi
We have been interested, in this work, to investigate the effect of the exposure to static magnetic field at 200 mT (SMF) on the fatty acid (FA) composition of Salmonella enterica subsp Enterica serovar Hadar isolate 287: effects on the proportion of saturated and unsaturated fatty acids (SFAs, UFAs), cyclopropane fatty acids (CFAs) and hydroxy fatty acids after exposure to the static magnetic field at 200 mT (SMF). Analysis with Gas Chromatography-Mass Spectrometry (GC-MS) of total lipid showed that the proportion of the most fatty acids was clearly affected...
July 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28432369/sensitivity-to-antibiotics-of-bacteria-exposed-to-gamma-radiation-emitted-from-hot-soils-of-the-high-background-radiation-areas-of-ramsar-northern-iran
#20
Seyed Mohammad Javad Mortazavi, Samira Zarei, Mohammad Taheri, Saeed Tajbakhsh, Seyed Alireza Mortazavi, Sahar Ranjbar, Fatemeh Momeni, Samaneh Masoomi, Leila Ansari, Mohammad Mehdi Movahedi, Shahram Taeb, Sina Zarei, Masood Haghani
BACKGROUND: Over the past several years our laboratories have investigated different aspects of the challenging issue of the alterations in bacterial susceptibility to antibiotics induced by physical stresses. OBJECTIVE: To explore the bacterial susceptibility to antibiotics in samples of Salmonella enterica subsp. enterica serovar Typhimurium (S. typhimurium), Staphylococcus aureus, and Klebsiella pneumoniae after exposure to gamma radiation emitted from the soil samples taken from the high background radiation areas of Ramsar, northern Iran...
April 2017: International Journal of Occupational and Environmental Medicine
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