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https://www.readbyqxmd.com/read/28913868/alterations-of-c-di-gmp-turnover-proteins-modulate-semi-constitutive-rdar-biofilm-formation-in-commensal-and-uropathogenic-escherichia-coli
#1
Annika Cimdins, Roger Simm, Fengyang Li, Petra Lüthje, Kaisa Thorell, Åsa Sjöling, Annelie Brauner, Ute Römling
Agar plate-based biofilm of enterobacteria like Escherichia coli is characterized by expression of the extracellular matrix components amyloid curli and cellulose exopolysaccharide, which can be visually enhanced upon addition of the dye Congo Red, resulting in a red, dry, and rough (rdar) colony morphology. Expression of the rdar morphotype depends on the transcriptional regulator CsgD and occurs predominantly at ambient temperature in model strains. In contrast, commensal and pathogenic isolates frequently express the csgD-dependent rdar morphotype semi-constitutively, also at human host body temperature...
September 15, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28892259/cellulose-production-is-coupled-to-sensing-of-the-pyrimidine-biosynthetic-pathway-via-c-di-gmp-production-by-the-dgcq-protein-of-escherichia-coli
#2
Elio Rossi, Sara Motta, Alessandro Aliverti, Federica Cossu, Louise Gourlay, Pierluigi Mauri, Paolo Landini
Production of cellulose, a stress response-mediated process in enterobacteria, is modulated in Escherichia coli by the activity of the two pyrimidine nucleotide biosynthetic pathways, namely, the de novo biosynthetic pathway, and the salvage pathway, which relies on the environmental availability of pyrimidine nitrogenous bases. We had previously reported that prevalence of the salvage over the de novo pathway triggers cellulose production via synthesis of the second messenger c-di-GMP by the DgcQ (YedQ) diguanylate cyclase...
September 11, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28873604/effect-of-six-different-starter-cultures-on-the-concentration-of-residual-nitrite-in-fermented-sausages-during-in-vitro-human-digestion
#3
Hyeong Sang Kim, Sun Jin Hur
The objective of this study was to determine the effect of six different starter cultures of enterobacteria on the concentration of residual nitrite in fermented sausages during in vitro human digestion. Before digestion, the concentration of residual nitrite was dependent on starter culture in fermented sausage and ranged from 25.2 to 33.2mg/kg. Among the six starter cultures of enterobacteria, Pediococcus acidilactici, Pediococcus pentosaceus, and Staphylococcus carnosus showed higher nitrite depletion ability than the other three strains in fermented sausages...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28867789/multiple-antibiotic-resistant-extended-spectrum-%C3%AE-lactamase-esbl-producing-enterobacteria-in-fresh-seafood
#4
Asem Sanjit Singh, Manjusha Lekshmi, Sreepriya Prakasan, Binaya Bhusan Nayak, Sanath Kumar
Members of the family Enterobacteriaceae include several human pathogens that can be acquired through contaminated food and water. In this study, the incidence of extended spectrum β-lactamase (ESBL)-producing enterobacteria was investigated in fresh seafood sold in retail markets. The ESBL-positive phenotype was detected in 169 (78.60%) isolates, with Escherichia coli being the predominant species (53), followed by Klebsiella oxytoca (27), and K. pneumoniae (23). More than 90% of the isolates were resistant to third generation cephalosporins, cefotaxime, ceftazidime, and cefpodoxime...
August 30, 2017: Microorganisms
https://www.readbyqxmd.com/read/28855672/evolution-of-gut-bifidobacterium-population-in-healthy-japanese-infants-over-the-first-three-years-of-life-a-quantitative-assessment
#5
Ravinder Nagpal, Takashi Kurakawa, Hirokazu Tsuji, Takuya Takahashi, Kazunari Kawashima, Satoru Nagata, Koji Nomoto, Yuichiro Yamashiro
Bifidobacteria are important members of human gut microbiota; however, quantitative data on their early-life dynamics is limited. Here, using a sensitive reverse transcription-qPCR approach, we demonstrate the carriage of eight signature infant-associated Bifidobacterium species (B. longum, B. breve, B. bifidum, B. catenulatum group, B. infantis, B. adolescentis, B. angulatum and B. dentium) in 76 healthy full-term vaginally-born infants from first day to three years of life. About 21% babies carry bifidobacteria at first day of life (6...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28845933/-is-bacteriological-testing-of-bladder-urine-informative-in-acute-obstructive-pyelo-nephritis
#6
M I Kogan, Yu L Naboka, S K Bedzhanyan, E V Mitusova, I A Gudima, P P Morgun, L I Vasileva
The problem of the etiology and pathogenesis of acute obstructive pyelonephritis (OOP) remains one of the challenging issues of modern urology. Etiological agents of pyelonephritis can be both gram-negative and gram-positive opportunistic bacteria mostly belonging to the normal flora in humans. The generally accepted diagnostic work-up involves a bacteriological testing of not pelvic urine, but of bladder urine collected by a transurethral catheter or midstream specimens of urine collected from the patients...
July 2017: Urologii︠a︡
https://www.readbyqxmd.com/read/28830739/molecular-bases-for-multidrug-resistance-in-yersinia-pseudotuberculosis
#7
Nicolas Cabanel, Marc Galimand, Christiane Bouchier, Margarita Chesnokova, Valery Klimov, Elisabeth Carniel
The enteropathogen Yersinia pseudotuberculosis causes gastrointestinal infections in humans. Although this species is usually susceptible to antibiotics active against Gram-negative bacteria, we identified three multidrug resistant (MDR) strains of Y. pseudotuberculosis that were isolated from the environment in Russia and from a patient in France. The resistance traits of the two Russian isolates were transferable at high frequencies (≈2×10(-1)/donor CFU) to Y. pseudotuberculosis. In contrast no transfer of the antibiotic resistances carried by the French strain was observed...
August 16, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28827753/restriction-and-modification-of-deoxyarchaeosine-dg-containing-phage-9%C3%A2-g-dna
#8
Rebecca Tsai, Ivan R Corrêa, Michael Y Xu, Shuang-Yong Xu
E. coli phage 9 g contains the modified base deoxyarchaeosine (dG(+)) in its genome. The phage encodes its own primase, DNA ligase, DNA polymerase, and enzymes necessary to synthesize and incorporate dG(+). Here we report phage 9 g DNA sensitivity to >200 Type II restriction endonucleases (REases). Among the REases tested approximately 29% generated complete or partial digestions, while the remaining 71% displayed resistance to restriction. Phage 9 g restriction fragments can be degraded by DNA exonucleases or ligated by T3 and T4 DNA ligases...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805544/rna-silencing-in-plant-symbiotic-bacteria-insights-from-a-protein-centric-view
#9
José I Jiménez-Zurdo, Marta Robledo
Extensive work in model enterobacteria has evidenced that the RNA chaperone Hfq and several endoribonucleases, such as RNase E or RNase III, serve pivotal roles in small RNA-mediated post-transcriptional silencing of gene expression. Characterization of these protein hubs commonly provide global functional and mechanistic insights into complex sRNA regulatory networks. The legume endosymbiont Sinorhizobium meliloti is a non-classical model bacterium with a very complex lifestyle in which riboregulation is expected to play important adaptive functions...
August 14, 2017: RNA Biology
https://www.readbyqxmd.com/read/28771154/multiresistant-opportunistic-pathogenic-bacteria-isolated-from-polluted-rivers-and-first-detection-of-nontuberculous-mycobacteria-in-the-algerian-aquatic-environment
#10
Lydia Neïla Djouadi, Okba Selama, Ahmed Abderrahmani, Amel Bouanane-Darenfed, Lamia Abdellaziz, Meriam Amziane, Marie-Laure Fardeau, Farida Nateche
Opportunistic infections constitute a major challenge for modern medicine mainly because the involved bacteria are usually multiresistant to antibiotics. Most of these bacteria possess remarkable ability to adapt to various ecosystems, including those exposed to anthropogenic activities. This study isolated and identified 21 multiresistant opportunistic bacteria from two polluted rivers, located in Algiers. Cadmium, lead, and copper concentrations were determined for both water samples to evaluate heavy metal pollution...
August 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/28750094/crystal-structure-and-kinetic-analysis-of-the-class-b3-di-zinc-metallo-%C3%AE-lactamase-lra-12-from-an-alaskan-soil-metagenome
#11
María Margarita Rodríguez, Raphaël Herman, Barbara Ghiglione, Frédéric Kerff, Gabriela D'Amico González, Fabrice Bouillenne, Moreno Galleni, Jo Handelsman, Paulette Charlier, Gabriel Gutkind, Eric Sauvage, Pablo Power
We analyzed the kinetic properties of the metagenomic class B3 β-lactamase LRA-12, and determined its crystallographic structure in order to compare it with prevalent metallo-β-lactamases (MBLs) associated with clinical pathogens. We showed that LRA-12 confers extended-spectrum resistance on E. coli when expressed from recombinant clones, and the MIC values for carbapenems were similar to those observed in enterobacteria expressing plasmid-borne MBLs such as VIM, IMP or NDM. This was in agreement with the strong carbapenemase activity displayed by LRA-12, similar to GOB β-lactamases...
2017: PloS One
https://www.readbyqxmd.com/read/28725891/fecal-excretion-of-maillard-reaction-products-and-the-gut-microbiota-composition-of-rats-fed-with-bread-crust-or-bread-crumb
#12
C Helou, P M Anton, C Niquet-Léridon, M Spatz, F J Tessier, P Gadonna-Widehem
A comparison between the impacts of advanced (N(ε)-carboxymethyllysine - CML) and terminal (melanoidins) Maillard reaction products from bread on gut microbiota was carried out in this study. Gut microbiota composition as well as fecal excretion of CML from both bread crust and bread crumb, and of melanoidins from bread crust were assessed on a rodent model. Rats were fed with pellets supplemented or not with 13% of bread crust, bread crumb, a fiber-free bread crust model (glucose, starch and gluten heated together) or a fiber-free-melanoidin-free bread model (glucose-starch and gluten heated separately) for four weeks...
August 1, 2017: Food & Function
https://www.readbyqxmd.com/read/28691832/-identification-of-bacteria-from-blood-cultures-by-fluorescence-in-situ-hybridization
#13
L Černohorská, L Dolinková
The diagnosis of bacterial agents of sepsis from blood cultures is crucial for the subsequent treatment of this condition. The aim of this study was to compare Gram stain, culture, and biochemical identification (conventional methods) and fluorescence in-situ hybridisation (FISH) that detects microorganisms from positive blood cultures using specific probes. Another aim was to evaluate the potential of this method for use in clinical practice. Altogether 71 samples of positive blood cultures were tested by FISH...
2017: Epidemiologie, Mikrobiologie, Imunologie
https://www.readbyqxmd.com/read/28688673/characterization-of-phebe7-an-incfii-type-virulence-resistance-plasmid-carrying-blactx-m-98b-blatem-1-and-rmtb-genes-detected-in-escherichia-coli-from-a-chicken-isolate-in-china
#14
Yan-Xian Yang, Yong-Qiang Yang, Chang-Wei Lei, Bi-Hui Liu, Wei Jiang, Hong-Ning Wang, Maria Consuelo Gazitúa, An-Yun Zhang
Recently, a novel variant of the CTX-M enzyme, CTX-M-98, was detected in Escherichia coli isolates from food animals. However, few plasmids carrying blaCTX-M-98 have been fully characterized. In this study, we sequenced the complete pHeBE7 plasmid, an 86,015-bp plasmid that contains the blaCTX-M-98b, blaTEM-1, rmtB, and traT genes, using whole-genome sequencing. The backbone of pHeBE7 shows a high similarity (>99%) to pMC-NDM, which carries the blaNDM-1 gene, however its mosaic regions remain relatively unique among sequenced plasmids...
July 6, 2017: Plasmid
https://www.readbyqxmd.com/read/28684708/porcine-epidemic-diarrhea-in-europe-in-detail-analyses-of-disease-dynamics-and-molecular-epidemiology
#15
Dennis Hanke, Anne Pohlmann, Carola Sauter-Louis, Dirk Höper, Julia Stadler, Mathias Ritzmann, Adi Steinrigl, Bernd-Andreas Schwarz, Valerij Akimkin, Robert Fux, Sandra Blome, Martin Beer
Porcine epidemic diarrhea (PED) is an acute and highly contagious enteric disease of swine caused by the eponymous virus (PEDV) which belongs to the genus Alphacoronavirus within the Coronaviridae virus family. Following the disastrous outbreaks in Asia and the United States, PEDV has been detected also in Europe. In order to better understand the overall situation, the molecular epidemiology, and factors that might influence the most variable disease impact; 40 samples from swine feces were collected from different PED outbreaks in Germany and other European countries and sequenced by shot-gun next-generation sequencing...
July 6, 2017: Viruses
https://www.readbyqxmd.com/read/28655678/prevalence-of-extended-spectrum-beta-lactamase-phenotypes-in-enterobacteria-isolated-from-blood-cultures-of-patients-at-admission-to-the-university-hospital-of-bamako
#16
S A Sangaré, A I Maïga, A Maïga, S Diallo, N Camara, S Savadogo, I Guindo, F Bougoudogo, L Armand-Lefèvre, A Andremont, I I Maïga
The aim of our study was to determine the frequency of extended-spectrum beta-lactamase (ESBL) phenotypes among the enterobacteria present in blood cultures of patients at admission to two university hospitals of Bamako (Mali). During a period of three months, we isolated enterobacteria from blood cultures from patients upon admission to the Point G and Gabriel Toure University Hospitals. The ESBL-positive enterobacteria were initially identified by API 20E strips and VITEK(®)2 and then confirmed in France by MALDI-TOF mass spectrometry at the Bichat Hospital bacteriology laboratory...
June 1, 2017: Médecine et Santé Tropicales
https://www.readbyqxmd.com/read/28652301/stand-alone-eal-domain-proteins-form-a-distinct-subclass-of-eal-proteins-involved-in-regulation-of-cell-motility-and-biofilm-formation-in-enterobacteria
#17
Youssef El Mouali, Hyunhee Kim, Irfan Ahmad, Annelie Brauner, Ying Liu, Mikael Skurnik, Michael Y Galperin, Ute Römling
The second messenger cyclic dimeric GMP (c-di-GMP) is almost ubiquitous among bacteria as are the c-di-GMP turnover proteins, which mediate the transition between motility and sessility. EAL domain proteins have been characterized as c-di-GMP-specific phosphodiesterases. While most EAL domain proteins contain additional, usually N-terminal, domains, there is a distinct family of proteins with stand-alone EAL domains, exemplified by Salmonella enterica serovar Typhimurium proteins STM3611 (YhjH/PdeH), a c-di-GMP-specific phosphodiesterase, and the enzymatically inactive STM1344 (YdiV/CdgR) and STM1697, which regulate bacterial motility through interaction with the flagellar master regulator, FlhDC...
September 15, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28637194/high-iron-supply-inhibits-the-synthesis-of-the-genotoxin-colibactin-by-pathogenic-escherichia-coli-through-a-non-canonical-fur-ryhb-mediated-pathway
#18
Sophie Tronnet, Christophe Garcie, Alexander O Brachmann, Jörn Piel, Eric Oswald, Patricia Martin
The genotoxin colibactin is a secondary metabolite produced by a variety of pathogenic Enterobacteria, and is associated with colon cancer development and acute systemic infections. The colibactin biosynthesis requires the enzymatic activity of the phosphopantetheinyl transferase ClbA. We recently evidenced that two master regulators of bacterial iron homeostasis, i.e. the ferric uptake regulator (Fur) and the small regulatory non-coding RNA RyhB, were involved in the regulation of the clbA transcription and of the colibactin production...
July 31, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28634323/intestinal-microbial-dysbiosis-aggravates-the-progression-of-alzheimer-s-disease-in-drosophila
#19
Shih-Cheng Wu, Zih-Syuan Cao, Kuo-Ming Chang, Jyh-Lyh Juang
Neuroinflammation caused by local deposits of Aβ42 in the brain is key for the pathogenesis and progression of Alzheimer's disease. However, inflammation in the brain is not always a response to local primary insults. Gut microbiota dysbiosis, which is recently emerging as a risk factor for psychiatric disorders, can also initiate a brain inflammatory response. It still remains unclear however, whether enteric dysbiosis also contributes to Alzheimer's disease. Here we show that in a Drosophila Alzheimer's disease model, enterobacteria infection exacerbated progression of Alzheimer's disease by promoting immune hemocyte recruitment to the brain, thereby provoking TNF-JNK mediated neurodegeneration...
June 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28631499/the-microbial-contamination-and-the-presence-of-%C3%AE-lactamase-producing-gram-negative-bacteria-in-the-water-and-on-the-surfaces-of-public-recreation-water-facilities
#20
Karmen Godič Torkar, Mirjana Dražetić
The microbiological quality of bathing water and the surfaces of the surrounding pool platforms of two pools was estimated. ESBL- and MBL-producing Gram-negative bacteria isolated from water and surface samples were also studied. The water samples were satisfactory in 31 (86.1 %) out of 36 cases. Pseudomonas aeruginosa as well as Escherichia coli were identified in only 2 (5.5 %) cases. There were no correlations between the HPC and number of enterobacteria in the pool water and those found in the surface samples...
June 20, 2017: International Journal of Environmental Health Research
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