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https://www.readbyqxmd.com/read/29156755/escherichia-coli-nissle-1917-engineered-to-express-tum-5-can-restrain-murine-melanoma-growth
#1
Lian He, Huijun Yang, Fei Liu, Yiyan Chen, Sijia Tang, Wei Ji, Jianli Tang, Zhudong Liu, Yunjun Sun, Shengbiao Hu, Youming Zhang, Xiong Liu, Weitao Huang, Xuezhi Ding, Liqiu Xia
Tumor growth and metastasis depend on angiogenesis. Thus, inhibiting tumor angiogenesis has become promising cancer therapeutic strategy in recent years. Tumstatin is a more powerful angiogenesis inhibitor than endostatin. Anti-angiogenic active fragment encoding amino acids 45-132 (Tum-5) of tumstatin was subcloned into four different inducible expression vectors and successfully solubly expressed in Escherichia coli BL21 (DE3) in this study. Subsequently, an anaerobic inducible expression vector was constructed under Vitreoscilla hemoglobin gene promoter Pvhb in E...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29156596/microvesicle-involvement-in-shiga-toxin-associated-infection
#2
REVIEW
Annie Villysson, Ashmita Tontanahal, Diana Karpman
Shiga toxin is the main virulence factor of enterohemorrhagic Escherichia coli, a non-invasive pathogen that releases virulence factors in the intestine, causing hemorrhagic colitis and, in severe cases, hemolytic uremic syndrome (HUS). HUS manifests with acute renal failure, hemolytic anemia and thrombocytopenia. Shiga toxin induces endothelial cell damage leading to platelet deposition in thrombi within the microvasculature and the development of thrombotic microangiopathy, mostly affecting the kidney. Red blood cells are destroyed in the occlusive capillary lesions...
November 19, 2017: Toxins
https://www.readbyqxmd.com/read/29156489/an-adherent-mucus-layer-attenuates-the-genotoxic-effect-of-colibactin
#3
Christian Reuter, Mona Alzheimer, Heike Walles, Tobias A Oelschlaeger
The human gastrointestinal tract is a complex ecosystem in which epithelial cells and microorganisms of the intestinal microbiota live in symbiosis. Certain members of the microbiota, in particular Escherichia coli strains of the B2 phylotype, carry the polyketide synthase (pks)-island encoding the genotoxin colibactin. Colibactin is a non-ribosomal peptide (NRP) or polyketide (PK)-NRP hybrid of still unsolved structure, which induces DNA double strand breaks (DSBs) in eukaryotic cells. However, direct contact between live bacteria and host cell is required in order to elicit these genotoxic effects...
November 20, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/29156457/discovery-of-novel-thiazol-2-amines-and-their-analogues-as-bioactive-molecules-design-synthesis-docking-and-biological-evaluation
#4
Anil Kumar Verma, Abha Bishnoi, Shaheen Fatma, Huda Parveen, Vineeta Singh
A simple and highly efficient procedure for the synthesis of novel thiazol-2-amines, via Mannich reaction with secondary amines, is described. The newly synthesized derivatives 8(a-e) and 9(a-e) were characterized by (1)H NMR, (13)C NMR, IR, Mass spectroscopy and elemental analysis. All the derivatives were evaluated for their in-vitro anti-microbial activity against a panel of pathogenic strains of bacteria and fungi. The SAR showed that the secondary amines had a significant impact on the in-vitro antimicrobial activity of this class of agents...
November 20, 2017: Drug Research
https://www.readbyqxmd.com/read/29156394/assessment-of-sampling-strategies-for-estimation-of-site-mean-concentrations-of-stormwater-pollutants
#5
David T McCarthy, Kefeng Zhang, Camilla Westerlund, Maria Viklander, Jean-Luc Bertrand-Krajewski, Tim D Fletcher, Ana Deletic
The estimation of stormwater pollutant concentrations is a primary requirement of integrated urban water management. In order to determine effective sampling strategies for estimating pollutant concentrations, data from extensive field measurements at seven different catchments was used. At all sites, 1-min resolution continuous flow measurements, as well as flow-weighted samples, were taken and analysed for total suspend solids (TSS), total nitrogen (TN) and Escherichia coli (E. coli). For each of these parameters, the data was used to calculate the Event Mean Concentrations (EMCs) for each event...
October 23, 2017: Water Research
https://www.readbyqxmd.com/read/29156350/photodynamic-inactivation-of-escherichia-coli-correlation-of-singlet-oxygen-kinetics-and-phototoxicity
#6
Alexander Müller, Annegret Preuß, Beate Röder
Photodynamic inactivation (PDI) of bacteria may play a major role in facing the challenge of the ever expanding antibiotic resistances. Here we report about the direct correlation of singlet oxygen luminescence kinetics and phototoxicity in E. coli cell suspension under PDI using the widely applied cationic photosensitizer TMPyP. Through direct access to the microenvironment, the time resolved investigation of singlet oxygen luminescence plays a key role in understanding the photosensitization mechanism and inactivation pathway...
November 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156244/isolation-and-characterization-of-polyvalent-bacteriophages-infecting-multi-drug-resistant-salmonella-serovars-isolated-from-broilers-in-egypt
#7
Mayada Mahmoud, Ahmed Askora, Ahmed Barakat Barakat, Omar El-Farouk Rabie, Sayed Emam Hassan
In this study, we isolated and characterized three phages named as Salmacey1, Salmacey2 and Salmacey3, infecting multi drug resistant Salmonella serovars isolated from broilers in Egypt. The most prevalent Salmonella serovars were S. typhimurium, S. enteritidis, and S. kentucky. All these Salmonella serovars were found to be resistant to more than two of the ten antimicrobial agents tested. Only S. kentucky was found to be resistant to seven antimicrobial agents. Examination of these phage particles by transmission electron microscopy (TEM), demonstrated that two phages (Salmacey1, Salmacey2) were found to belong to family Siphoviridae, and Salmacey3 was assigned to the family Myoviridae...
November 14, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29156217/characterization-of-udp-glucosyltransferase-from-indigofera-tinctoria
#8
Shintaro Inoue, Toshiki Moriya, Rihito Morita, Keiko Kuwata, Sanjog T Thul, Bijaya K Sarangi, Yoshiko Minami
Indican is a secondary metabolite in Indigofera tinctoria; its synthesis from indoxyl and UDP-glucose is catalyzed by a UDP-glucosyltransferase (UGT). In this study, we partially purified UGT extracted from I. tinctoria leaves and analyzed the protein by peptide mass fingerprinting. We identified two fragments that were homologous to UGT after comparison with the transcriptomic data of I. tinctoria leaves. The fragments were named itUgt1 and itUgt2 and were amplified using rapid amplification of cDNA ends polymerase chain reaction to obtain full-length cDNAs...
November 6, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29156123/a-nanopore-based-label-free-and-real-time-monitoring-assay-for-dna-methyltransferase-activity-and-inhibition
#9
Sana Rauf, Ling Zhang, Asghar Ali, Jalal Ahmad, Yang Liu, Jinghong Li
DNA methylation catalyzed by DNA methyltransferase plays an important role in many biological processes. However, conventional assays proposed for DNA methyltransferase activity are laborious and discontinuous. We describe a novel method for real-time monitoring of the activity and kinetics of Escherichia coli DNA adenine methyltransferase (Dam), using nanopore technique coupled with enzyme-linkage reactions. A double-stranded DNA probe AB having a recognition sequence 5'-GATC-3' for both Dam and MboI restriction endonuclease was prepared...
November 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29155867/spectrum-of-pathogen-and-model-specific-histopathologies-in-mouse-models-of-acute-pneumonia
#10
Kristina Dietert, Birgitt Gutbier, Sandra M Wienhold, Katrin Reppe, Xiaohui Jiang, Ling Yao, Catherine Chaput, Jan Naujoks, Markus Brack, Alexandra Kupke, Christin Peteranderl, Stephan Becker, Carolin von Lachner, Nelli Baal, Hortense Slevogt, Andreas C Hocke, Martin Witzenrath, Bastian Opitz, Susanne Herold, Holger Hackstein, Leif E Sander, Norbert Suttorp, Achim D Gruber
Pneumonia may be caused by a wide range of pathogens and is considered the most common infectious cause of death in humans. Murine acute lung infection models mirror human pathologies in many aspects and contribute to our understanding of the disease and the development of novel treatment strategies. Despite progress in other fields of tissue imaging, histopathology remains the most conclusive and practical read out tool for the descriptive and semiquantitative evaluation of mouse pneumonia and therapeutic interventions...
2017: PloS One
https://www.readbyqxmd.com/read/29155570/chemistry-antimicrobial-mechanisms-and-antibiotic-activities-of-cinnamaldehyde-against-pathogenic-bacteria-in-animal-feeds-and-human-foods
#11
Mendel Friedman
Cinnamaldehyde is a major constituent of cinnamon essential oils produced by aromatic cinnamon plants. This compound has been reported to exhibit antimicrobial properties in vitro in laboratory media and in animal feeds and human foods contaminated with disease-causing bacteria including Bacillus cereus, Campylobacter jejuni, Clostridium perfringens, Escherichia coli, Listeria monocytogenes, and Salmonella enterica. This integrated review surveys and interprets our current knowledge of the chemistry, analysis, safety, mechanism of action, and antibiotic activities of cinnamaldehyde in food animal (cattle, lambs, calves, pigs, poultry) diets and in widely consumed liquid (apple, carrot, tomato, and watermelon juices, milk) and solid foods...
November 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29155566/structure-based-insights-into-dynamics-and-function-of-two-domain-slpa-from-escherichia-coli
#12
Anne-Juliane Geitner, Ulrich Weininger, Hauke Paulsen, Jochen Balbach, Michael Kovermann
SlpA (SlyD like protein A) comprises two domains, a FK506 binding domain (FKBP fold) of moderate prolyl cis/trans isomerase activity and an inserted in flap (IF) domain that hosts its chaperone activity. Here we present the NMR solution structure of apo E. coli SlpA determined by NMR which mirrors the structural properties seen for various SlyD homologs. Crucial structural differences in side-chain orientation arise for F37 which points directly into the hydrophobic core of the active site. It forms a prominent aromatic stacking with F15, one of the key residues for PPIase activity, thus giving a possible explanation for the inherently low PPIase activity of SlpA...
November 20, 2017: Biochemistry
https://www.readbyqxmd.com/read/29155402/synthesis-of-silver-nanoparticles-from-a-desmodium-adscendens-extract-and-its-antibacterial-evaluation-on-wound-dressing-material
#13
Jaya R Lakkakula, Derek Tantoh Ndinteh, Sandy F van Vuuren, Denise K Olivier, Rui W M Krause
The one-pot synthesis of silver nanoparticles (AgNPs) using the medium-polar extract of Desmodium adscendens (Sw.) DC. is presented here as an alternative synthesis of metal NPs. Characterisation of the formed NPs showed polydispersed AgNPs ranging from 15 to 100 nm where the concentration of metal ions was found to play a role in the size and shape of the prepared NPs. It could be established that the flavonoids, saponins, and alkaloids present in the extract acted as both reducing and stabilising agents during the formation of the capped metal NPs...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29155397/facile-phyto-mediated-synthesis-of-silver-nanoparticles-using-chinese-winter-jujube-ziziphus-jujuba-mill-cv-dongzao-extract-and-their-antibacterial-catalytic-properties
#14
Chun-Gang Yuan, Can Huo, Bing Gui, Jing-Fu Liu, Yong-Sheng Chen
The aqueous extract of Chinese winter jujube (Ziziphus jujuba Mill. cv. Dongzao) was used as reducing and capping agents for the synthesis of silver nanoparticles (AgNPs) for the first time. The resulting AgNPs were characterised by UV/Visible (UV-Vis) spectroscopy, atomic force microscope, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray and Fourier transform infrared spectroscopy (FTIR). The colloidal solution of AgNPs gave a maximum UV-Vis absorbance at 446 nm...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29155392/green-synthesised-zinc-oxide-nanostructures-through-periploca-aphylla-extract-shows-tremendous-antibacterial-potential-against-multidrug-resistant-pathogens
#15
Fazal Abbas, Qaisar Maqbool, Mudassar Nazar, Nyla Jabeen, Syed Zaheer Hussain, Sadaf Anwaar, Nasir Mehmood, Muhammad Saleem Sheikh, Talib Hussain, Sidra Iftikhar
To grapple with multidrug resistant bacterial infections, implementations of antibacterial nanomedicines have gained prime attention of the researchers across the globe. Nowadays, zinc oxide (ZnO) at nano-scale has emerged as a promising antibacterial therapeutic agent. Keeping this in view, ZnO nanostructures (ZnO-NS) have been synthesised through reduction by P. aphylla aqueous extract without the utilisation of any acid or base. Structural examinations via scanning electron microscopy (SEM) and X-ray diffraction have revealed pure phase morphology with highly homogenised average particle size of 18 nm...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29155329/cloning-and-characterization-of-two-novel-%C3%AE-glucosidase-genes-encoding-isoenzymes-of-the-cellobiase-complex-from-cellulomonas-biazotea
#16
Anthony K N Chan, Alan K L Ng, Kate K Y Ng, W K R Wong
Enzymatic degradation of cellulosic waste to generate renewable biofuels has offered an attractive solution to the energy problem. Synergistic hydrolysis of cellulose residues requires the participation of three different types of cellulases - endoglucanases, exoglucanases, and β-glucosidases (Bgl). Our group has been interested in using Bgl of Cellulomonas biazotea in studies designed to investigate cooperative action among different cellulases. We previously have cloned bgl genes encoding Cba and Cba3, which are C...
November 16, 2017: Gene
https://www.readbyqxmd.com/read/29155212/effect-of-isoquercitrin-on-membrane-dynamics-and-apoptosis-like-death-in-escherichia-coli
#17
JiEun Yun, Eun-Rhan Woo, Dong Gun Lee
Minimum inhibitory concentration (MIC) is defined as the lowest concentration of a compound that completely inhibits microbial growth. Antibacterial mechanisms of compounds have been investigated at their sub-MICs as well as at their MIC. In this study, the effects of sub-MIC and MIC of isoquercitrin on Escherichia coli were investigated. The antibacterial effect of isoquercitrin was tested using the microdilution method. Sub-MICs of isoquercitrin induced the production of reactive oxygen species and depletion of glutathione...
November 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29155201/biochemical-properties-of-the-htra-homolog-from-bacterium-stenotrophomonas-maltophilia
#18
Urszula Zarzecka, Anna Modrak-Wojcik, Martyna Bayassi, Maciej Szewczyk, Artur Gieldon, Adam Lesner, Tomasz Koper, Agnieszka Bzowska, Maurizio Sanguinetti, Steffen Backert, Barbara Lipinska, Joanna Skorko-Glonek
The HtrA proteins due to their proteolytic, and in many cases chaperone activity, efficiently counteract consequences of stressful conditions. In the environmental bacterium and nosocomial pathogen Stenotrophomonas maltophilia HtrA (HtrASm) is induced as a part of adaptive response to host temperature (37°C). We examined the biochemical properties of HtrASm and compared them with those of model HtrAEc from Escherichia coli. We found that HtrASm is a protease and chaperone that operates over a wide range of pH and is highly active at temperatures between 35-37°C...
November 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29155090/proteome-and-phosphoproteome-analysis-of-commensally-induced-dendritic-cell-maturation-states
#19
Ali Giray Korkmaz, Todor Popov, Loulou Peisl, Marius Cosmin Codrea, Sven Nahnsen, Alexander Steimle, Ana Velic, Boris Macek, Martin von Bergen, Joerg Bernhardt, Julia-Stefanie Frick
Dendritic cells (DCs) can shape the immune system towards an inflammatory or tolerant state depending on the bacterial antigens and the environment they encounter. In this study we provide a proteomic catalogue of differentially expressed proteins between distinct DC maturation states, brought about by bacteria that differ in their endotoxicity. To achieve this, we have performed proteomics and phosphoproteomics on murine DC cultures. Symbiont and pathobiont bacteria were used to direct dendritic cells into a semi-mature and fully-mature state, respectively...
November 15, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/29155061/increasing-oxygen-availability-for-improving-poly-3-hydroxybutyrate-production-by-halomonas
#20
Pengfei Ouyang, Huan Wang, Ivan Hajnal, Qiong Wu, Yingying Guo, Guo-Qiang Chen
Technologies enabling high-cell-density growth are required for economical industrial production of most biotechnological products. However, the key factor limiting cell density in bioreactors is the availability of oxygen during the late phases of fermentation. Although the expression of bacterial Vitreoscilla hemoglobin (VHb) is useful for enhanced oxygen availability, bacterial cell membrane makes efficient hemoglobin-oxygen contact a challenge. On the other hand, periplasmic spaces of Gram-negative microorganisms offer an excellent compartment for the intermittent storage of hemoglobin-bound oxygen...
November 15, 2017: Metabolic Engineering
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