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https://www.readbyqxmd.com/read/28328947/a-spontaneous-mutation-in-kdsd-a-biosynthesis-gene-for-3-deoxy-d-manno-octulosonic-acid-occurred-in-a-ciprofloxacin-resistant-strain-of-francisella-tularensis-and-caused-a-high-level-of-attenuation-in-murine-models-of-tularemia
#1
Taylor Chance, Jennifer Chua, Ronald G Toothman, Jason T Ladner, Jonathan E Nuss, Jo Lynne Raymond, Fabrice V Biot, Samandra Demons, Lynda Miller, Stephanie Halasohoris, Sherry Mou, Galina Koroleva, Sean Lovett, Gustavo Palacios, Nicholas J Vietri, Patricia L Worsham, Christopher K Cote, Todd M Kijek, Joel A Bozue
Francisella tularensis, a gram-negative facultative intracellular bacterial pathogen, is the causative agent of tularemia and able to infect many mammalian species, including humans. Because of its ability to cause a lethal infection, low infectious dose, and aerosolizable nature, F. tularensis subspecies tularensis is considered a potential biowarfare agent. Due to its in vitro efficacy, ciprofloxacin is one of the antibiotics recommended for post-exposure prophylaxis of tularemia. In order to identify therapeutics that will be efficacious against infections caused by drug resistant select-agents and to better understand the threat, we sought to characterize an existing ciprofloxacin resistant (CipR) mutant in the Schu S4 strain of F...
2017: PloS One
https://www.readbyqxmd.com/read/28318250/chemical-characterization-of-potentially-prebiotic-oligosaccharides-in-brewed-coffee-and-spent-coffee-grounds
#2
Tian Tian, Samara Freeman, Mark Corey, J Bruce German, Daniela Barile
Oligosaccharides are indigestible carbohydrates widely present in mammalian milk and in some plants. Milk oligosaccharides are associated with positive health outcomes; however, oligosaccharides in coffee have not been extensively studied. We investigated the oligosaccharides and their monomeric composition in dark roasted coffee beans, brewed coffee and spent coffee grounds. Oligosaccharides with a degree of polymerization ranging from 3 to 15, and their constituent monosaccharides were characterized and quantified...
March 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28280867/general-assay-for-enzymes-in-the-heptose-biosynthesis-pathways-using-electrospray-ionization-mass-spectrometry
#3
Jimin Park, Daeun Lee, Eun Kyoung Seo, Jae-Sang Ryu, Dong Hae Shin
The ADP-L-glycero-β-D-manno-heptose and the GDP-6-deoxy-α-D-manno-heptose biosynthesis pathways play important roles in constructing lipopolysaccharide of Gram-negative bacteria. Blocking the pathways is lethal or increases antibiotic susceptibility to pathogens. Therefore, the enzymes involved in the pathways are novel antibiotic drug targets. Here, we designed an efficient method to assay the whole enzymes in the pathways using mass spectrometry and screened 148 compounds. One promising lead is (-)-nyasol targeting D-glycero-α-D-manno-heptose-1-phosphate guanylyltransferase (HddC) included in the GDP-6-deoxy-α-D-manno-heptose biosynthesis pathway from Burkholderia pseudomallei...
March 9, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28267499/acylation-of-soluble-polysaccharides-in-a-biphasic-system-catalyzed-by-a-ce2-acetyl-esterase
#4
Maria Kanelli, Evangelos Topakas
Within the last decade, acylated polysaccharides have drawn attention, since they find applications in numerous fields as biocompatible and biodegradable amphiphilic compounds. The ability of a CE2 acetyl esterase from Clostridium thermocellum to catalyze acyl transfer to β-glucan and manno-polysaccharides of significant interest was investigated. Initially, screening tests were conducted on aldohexose monosaccharides and disaccharides, exploiting the enzyme's strict regioselectivity at O-6 position. Modified monosaccharides acquired acylation yields from 11 up to 65%, showing preference for small chain acyl donors, while disaccharides exhibited conversion yields from 23 up to 58%, with preference to monoacylation...
May 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28262014/high-efficiency-secretion-of-%C3%AE-mannanase-in-bacillus-subtilis-through-protein-synthesis-and-secretion-optimization
#5
Yafeng Song, Gang Fu, Huina Dong, Jianjun Li, Yuguang Du, Dawei Zhang
The manno endo-1, 4-mannosidase (β-mannanase, EC. 3.2.1.78) catalyzes the random hydrolysis of internal (1→4)-β-mannosidic linkages in the mannan polymers. A codon optimized β-mannanase gene from Bacillus licheniformis DSM13 was expressed in Bacillus subtilis. When four Sec-dependent and two Tat-dependent signal peptide sequences cloned from B. subtilis were placed upstream of the target gene, the highest activity of β-mannanase was observed using SPlipA as a signal peptide. Then, a 1.25-fold activity of β-mannanase was obtained when another copy of groESL operon was inserted into the genome of host strain...
March 6, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28257910/biomonitoring-of-toxic-metals-in-incinerator-workers-a-systematic-review
#6
Maria Chiara Mauriello, Carmine Sbordone, Paolo Montuori, Rossella Alfano, Maria Triassi, Ivo Iavicoli, Maurizio Manno
Exposure to chemicals released during urban waste disposal and treatment is increasingly regarded as a potential occupational health issue. Indeed, several toxic metals emitted by an incinerator, including As, Be, Cd, Cr, Pb, Mn, Hg, Ni and V, have potentially toxic properties and their exposure, therefore, may be of concern for the health of the workers involved. The levels of exposure should therefore be carefully measured. Environmental monitoring, however, may be unable, alone, to assess true exposure, due to its intrinsic limitations mainly concerning its inability to assess oral and dermal absorption...
March 1, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28243718/biodegradation-of-picolinic-acid-by-a-newly-isolated-bacterium-alcaligenes-faecalis-strain-jq135
#7
Jiguo Qiu, Junjie Zhang, Yanting Zhang, Yuhong Wang, Lu Tong, Qing Hong, Jian He
We isolated a bacterial strain JQ135 from municipal wastewater, which was capable of efficiently degrading picolinic acid (PA). Based on the physico-biochemical characteristics and 16S rDNA analysis, strain JQ135 was identified as Alcaligenes faecalis. In addition, strain JQ135 produced an orange pigment when cultured in the Luria-Bertani medium, which is different from the previously reported strains of A. faecalis. During the degradation of PA by the resting strain JQ135 cells, only one intermediate, 6-hydroxypicolinic acid (6HPA), was detected by ultraviolet spectrophotometry, high-pressure liquid chromatography, and liquid chromatography-mass spectrometry...
April 2017: Current Microbiology
https://www.readbyqxmd.com/read/28223130/antitumor-and-antimetastatic-activities-of-rhamnogalacturonan-ii-type-polysaccharide-isolated-from-mature-leaves-of-green-tea-via-activation-of-macrophages-and-natural-killer-cells
#8
Hye-Ryung Park, Dahyun Hwang, Hyung-Joo Suh, Kwang-Won Yu, Tae Young Kim, Kwang-Soon Shin
To investigate the antitumor and antimetastatic polysaccharide from the mature leaves of green tea, GTE-II was purified using size exclusion chromatography. GTE-II consisted of 15 different sugars including rarely observed sugars such as 2-O-methyl-fucose, 2-O-methyl-xylose, apiose, aceric acid, 3-deoxy-d-manno-2-octulosonic acid, and 3-deoxy-d-lyxo-2-heptulosaric acid, which were characteristics of pectic polysaccharide rhamnogalacturonan-II. Treatment of peritoneal macrophages with GTE-II not only increased interleukin (IL)-6 and IL-12 production, but also had significantly increased tumoricidal activity against Yac-1 tumor cells than those obtained from untreated mice...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28183158/colonic-postpolypectomy-bleeding-is-related-to-polyp-size-and-heparin-use
#9
Flavia Pigò, Helga Bertani, Mauro Manno, Vincenzo Giorgio Mirante, Angelo Caruso, Santi Mangiafico, Raffaele Manta, Anna Maria Rebecchi, Rita Luisa Conigliaro
Background/Aims: We studied factors influencing colon postpolypectomy bleeding (PPB), with a focus on antithrombotic and anticoagulation therapy. Methods: We conducted a retrospective case-control study of all patients who underwent polypectomy at our tertiary referral center in Italy between 2007 and 2014. Polyp characteristics (number of polyps removed per patient, size, morphology, location, resection technique, prophylactic hemostasis methods) and patient characteristics (age, sex, comorbidities, medication) were analyzed...
February 9, 2017: Clinical Endoscopy
https://www.readbyqxmd.com/read/28177319/expression-and-crystallographic-studies-of-d-glycero-%C3%AE-d-manno-heptose-1-phosphate-adenylyltransferase-from-burkholderia-pseudomallei
#10
Jimin Park, Hyojin Kim, Suwon Kim, Daeun Lee, Dong Hae Shin
The Gram-negative bacterium Burkholderia pseudomallei is the causative agent of melioidosis. D-glycero-β-D-manno-Heptose-1-phosphate adenylyltransferase (HldC) is the fourth enzyme of the ADP-L-glycero-β-D-manno-heptose biosynthesis pathway, which produces an essential carbohydrate comprising the inner core of lipopolysaccharide. Therefore, HldC is a potential target of antibiotics against melioidosis. In this study, HldC from B. pseudomallei has been cloned, expressed, purified and crystallized. Synchrotron X-ray data from a selenomethionine-substituted HldC crystal were also collected to 2...
February 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28162043/chest-ultrasonography-in-health-surveillance-of-asbestos-related-lung-diseases
#11
Andrea Smargiassi, Giuliana Pasciuto, Ilaria Pedicelli, Erminia Lo Greco, Mariarosaria Calvello, Riccardo Inchingolo, Gioacchino Schifino, Patrizio Capoluongo, Pasquale Patriciello, Maurizio Manno, Alfonso Cirillo, Giuseppe Maria Corbo, Gino Soldati, Ivo Iavicoli
OBJECTIVES: Exposure to asbestos fibers can lead to different lung diseases, such as pleural thickening and effusion, asbestosis, mesothelioma, and lung cancer. These diseases are expected to peak in the next few years. The aim of the study was to validate ultrasonography (US) as a diagnostic tool in the management of lung diseases in subjects with a history of occupational exposure to asbestos. METHODS: Fifty-nine retired male workers previously exposed to asbestos were enrolled in the study...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28137848/single-polysaccharide-assembly-protein-that-integrates-polymerization-termination-and-chain-length-quality-control
#12
Danielle M Williams, Olga G Ovchinnikova, Akihiko Koizumi, Iain L Mainprize, Matthew S Kimber, Todd L Lowary, Chris Whitfield
Lipopolysaccharides (LPS) are essential outer membrane glycolipids in most gram-negative bacteria. Biosynthesis of the O-antigenic polysaccharide (OPS) component of LPS follows one of three widely distributed strategies, and similar processes are used to assemble other bacterial surface glycoconjugates. This study focuses on the ATP-binding cassette (ABC) transporter-dependent pathway, where glycans are completed on undecaprenyl diphosphate carriers at the cytosol:membrane interface, before export by the ABC transporter...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28127097/synthesis-of-3-o-and-4-o-2-aminoethylphosphono-derivatives-of-methyl-l-glycero-%C3%AE-d-manno-heptopyranoside
#13
Martin Walter, Claudia Kohout, Markus Blaukopf, Paul Kosma
ABSTRACT: Phosphoethanolamine derivatives of the bacterial saccharide l-glycero-d-manno-heptose have been prepared using a phosphoramidite-based coupling reaction at position 4 of a side-chain-protected 2,3-O-orthoester methyl heptoside and at position 3 of a 3,4-diol heptoside, respectively. Global deprotection afforded the corresponding 2-aminoethylphosphodiester derivatives as substrates for crystallographic and binding studies with lectins and antibodies targeting the inner core structure of bacterial lipopolysaccharides...
2017: Monatshefte Für Chemie
https://www.readbyqxmd.com/read/28116883/on-the-terminology-to-refer-to-resistance-training-exercises
#14
Pietro Picerno, Renato Manno
No abstract text is available yet for this article.
January 23, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28107445/beta-glucans-supplementation-associates-with-reduction-in-p-cresyl-sulfate-levels-and-improved-endothelial-vascular-reactivity-in-healthy-individuals
#15
Carmela Cosola, Maria De Angelis, Maria Teresa Rocchetti, Eustacchio Montemurno, Valentina Maranzano, Giuseppe Dalfino, Carlo Manno, Annapaola Zito, Michele Gesualdo, Marco Matteo Ciccone, Marco Gobbetti, Loreto Gesualdo
BACKGROUND: Oat and barley beta-glucans are prebiotic fibers known for their cholesterol-lowering activity, but their action on the human gut microbiota metabolism is still under research. Although the induction of short-chain fatty acids (SCFA) following their ingestion has previously been reported, no study has investigated their effects on proteolytic uremic toxins p-cresyl sulfate (pCS) and indoxyl sulfate (IS) levels, while others have failed to demonstrate an effect on the endothelial function measured through flow-mediated dilation (FMD)...
2017: PloS One
https://www.readbyqxmd.com/read/28098447/the-stories-tryptophans-tell-exploring-protein-dynamics-of-heptosyltransferase-i-from-escherichia-coli
#16
Joy M Cote, Carlos A Ramirez-Mondragon, Zarek S Siegel, Daniel J Czyzyk, Jiali Gao, Yuk Y Sham, Ishita Mukerji, Erika A Taylor
Heptosyltransferase I (HepI) catalyzes the addition of l-glycero-β-d-manno-heptose to Kdo2-Lipid A, as part of the biosynthesis of the core region of lipopolysaccharide (LPS). Gram-negative bacteria with gene knockouts of HepI have reduced virulence and enhanced susceptibility to hydrophobic antibiotics, making the design of inhibitors of HepI of interest. Because HepI protein dynamics are partially rate-limiting, disruption of protein dynamics might provide a new strategy for inhibiting HepI. Discerning the global mechanism of HepI is anticipated to aid development of inhibitors of LPS biosynthesis...
January 30, 2017: Biochemistry
https://www.readbyqxmd.com/read/28095614/over-the-scope-clip-closure-for-treatment-of-post-pancreaticogastrostomy-occurring-pancreatic-fistula-a-case-series
#17
Santi Mangiafico, Angelo Caruso, Raffaele Manta, Giuseppe Grande, Helga Bertani, Vincenzo Mirante, Flavia Pigò, Luigi Magnano, Mauro Manno, Rita Conigliaro
BACKGROUND AND AIM: The over-the-scope clip (OTSC) system is a recently developed endoscopic device. In the last few years it has been successfully used for severe bleeding or deep wall lesions, or perforations of the GI tract. We hereby report a series of patients with post pancreaticogastrostomy occuring pancreatic fistula in whom OTSCs were used as endoscopic treatment. METHODS: We prospectively collected data from January 2012 to July 2015 about cases of postoperative pancreatic fistula...
January 17, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28078438/biological-monitoring-of-cobalt-in-hard-metal-factory-workers
#18
Andrea Princivalle, Ivo Iavicoli, Marzia Cerpelloni, Antonia Franceschi, Maurizio Manno, Luigi Perbellini
PURPOSE: The main aim of this study was to investigate the cobalt (Co) concentrations in urine along 4 months and their relationship with Co concentrations in blood and haemoglobin (adducts) in 34 workers from a hard metal manufacturing plant where metallic Co and Co oxide were used. Furthermore, the excretion kinetics of Co was investigated and the half-lives of Co in blood, plasma and urine were calculated along 18 days of non-exposure in the same workers. METHODS: Co was analysed, in all biological samples, by ICP/MS...
February 2017: International Archives of Occupational and Environmental Health
https://www.readbyqxmd.com/read/28069951/calsequestrin-depolymerizes-when-calcium-is-depleted-in-the-sarcoplasmic-reticulum-of-working-muscle
#19
Carlo Manno, Lourdes C Figueroa, Dirk Gillespie, Robert Fitts, ChulHee Kang, Clara Franzini-Armstrong, Eduardo Rios
Calsequestrin, the only known protein with cyclical storage and supply of calcium as main role, is proposed to have other functions, which remain unproven. Voluntary movement and the heart beat require this calcium flow to be massive and fast. How does calsequestrin do it? To bind large amounts of calcium in vitro, calsequestrin must polymerize and then depolymerize to release it. Does this rule apply inside the sarcoplasmic reticulum (SR) of a working cell? We answered using fluorescently tagged calsequestrin expressed in muscles of mice...
January 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28063198/functional-and-structural-studies-on-the-neisseria-gonorrhoeae-gmha-the-first-enzyme-in-the-glycero-manno-heptose-biosynthesis-pathways-demonstrate-a-critical-role-in-lipooligosaccharide-synthesis-and-gonococcal-viability
#20
Igor H Wierzbicki, Ryszard A Zielke, Konstantin V Korotkov, Aleksandra E Sikora
Sedoheptulose-7-phosphate isomerase, GmhA, is the first enzyme in the biosynthesis of nucleotide-activated-glycero-manno-heptoses and an attractive, yet underexploited, target for development of broad-spectrum antibiotics. We demonstrated that GmhA homologs in Neisseria gonorrhoeae and N. meningitidis (hereafter called GmhAGC and GmhANM , respectively) were interchangeable proteins essential for lipooligosaccharide (LOS) synthesis, and their depletion had adverse effects on neisserial viability. In contrast, the Escherichia coli ortholog failed to complement GmhAGC depletion...
January 7, 2017: MicrobiologyOpen
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