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https://www.readbyqxmd.com/read/29245137/synthesis-of-the-repeating-unit-of-o-specific-polysaccharide-isolated-from-the-water-borne-bacteria-aeromonas-bestiarum-207
#1
Yiren Xu, Guanghui Zong, Shuhui Jin, Jianjun Zhang
Aeromonas bestiarum 207 is a bacterial pathogen with severe impact on aquaculture. In a recent study, the structure of OPS antigens from Aeromonas bestiarum was identified as pentasaccharide repeating units. Synthesis of the pentasaccharide repeating unit and its derivative are reported. Stereo- and regio-specific synthesis was achieved under Schmidt glycosylation conditions employing appropriately protected L-rhamopyranosyl and D-glucopyranosylamine building blocks. The pentasaccharide synthesis was achieved using a [3 + 2] strategy with an overall yield of 5...
November 21, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/29245089/metabolic-analysis-of-panax-notoginseng-saponins-with-gut-microbiota-mediated-biotransformation-by-hplc-dad-q-tof-ms-ms
#2
Man-Yun Chen, Li Shao, Wei Zhang, Chong-Zhi Wang, Hong-Hao Zhou, Wei-Hua Huang, Chun-Su Yuan
Saponins such as notoginsenosides and ginsenosides from Panax notoginseng are responsible for the herb's clinical applications. Unfortunately, there is poor oral bioavailability of saponins. However, gut microbiota can transform saponins to yield the metabolites that are potential bioactive substances. In this study, we aimed to characterize the metabolic profiles of P. notoginseng saponins (PNS) by incubating them with human gut microbiota. The notoginsenosides, ginsenosides and related metabolites were separated and identified using a highly sensitive and selective high-performance liquid chromatography coupled with diode array detection/quadrupole tandem time-of-flight mass spectrometry (HPLC-DAD-Q-TOF-MS/MS)...
December 7, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29244725/exploring-the-glycans-of-euglena-gracilis
#3
Ellis C O'Neill, Sakonwan Kuhaudomlarp, Martin Rejzek, Jonatan U Fangel, Kathirvel Alagesan, Daniel Kolarich, William G T Willats, Robert A Field
Euglena gracilis is an alga of great biotechnological interest and extensive metabolic capacity, able to make high levels of bioactive compounds, such as polyunsaturated fatty acids, vitamins and β-glucan. Previous work has shown that Euglena expresses a wide range of carbohydrate-active enzymes, suggesting an unexpectedly high capacity for the synthesis of complex carbohydrates for a single-celled organism. Here, we present an analysis of some of the carbohydrates synthesised by Euglena gracilis. Analysis of the sugar nucleotide pool showed that there are the substrates necessary for synthesis of complex polysaccharides, including the unusual sugar galactofuranose...
December 15, 2017: Biology
https://www.readbyqxmd.com/read/29244520/enantioselective-total-synthesis-of-cannogenol-3-o-%C3%AE-l-rhamnoside-via-sequential-cu-ii-catalyzed-michael-addition-intramolecular-aldol-cyclization-reactions
#4
Bijay Bhattarai, Pavel Nagorny
A concise and scalable enantioselective total synthesis of the natural cardenolides cannogenol and cannogenol-3-O-α-l-rhamnoside has been achieved in 18 linear steps. The synthesis features a Cu(II)-catalyzed enantioselective and diastereoselective Michael reaction/tandem aldol cyclization and a one-pot reduction/transposition, which resulted in a rapid (6 linear steps) assembly of a functionalized intermediate containing C19 oxygenation that could be elaborated to cardenolide cannogenol. In addition, a strategy for achieving regio- and stereoselective glycosylation at the C3 position of synthetic cannogenol was developed and applied to the preparation of cannogenol-3-O-α-l-rhamnoside...
December 15, 2017: Organic Letters
https://www.readbyqxmd.com/read/29244514/diastereoselective-synthesis-of-c-vinyl-glycosides-via-gold-i-catalyzed-tandem-1-3-acyloxy-migration-ferrier-rearrangement
#5
Nianyu Huang, Hongze Liao, Hui Yao, Tianpeng Xie, Shasha Zhang, Kun Zou, Xue-Wei Liu
A novel gold-catalyzed C-glycosylation has been developed to gain access to α,(Z)-selective C-vinyl glycosides, starting from readily available glycals and propargylic carboxylate. This reaction involves a tandem intermolecular gold-catalyzed 1,3-acyloxy migration/Ferrier rearrangement with the involvement of allenic ester as the glycosyl acceptor. A wide range of substrate scope with good to excellent yields was achieved with complete diastereoselectivity.
December 15, 2017: Organic Letters
https://www.readbyqxmd.com/read/29244074/the-heart-regulates-the-endocrine-response-to-heart-failure-cardiac-contribution-to-circulating-neprilysin
#6
Mattia Arrigo, Nicolas Vodovar, Hélène Nougué, Malha Sadoune, Chris J Pemberton, Pamela Ballan, Pierre-Olivier Ludes, Nicolas Gendron, Alain Carpentier, Bernard Cholley, Philippe Bizouarn, Alain Cohen-Solal, Jagmeet P Singh, Jackie Szymonifka, Christian Latremouille, Jane-Lise Samuel, Jean-Marie Launay, Julien Pottecher, A Mark Richards, Quynh A Truong, David M Smadja, Alexandre Mebazaa
Aims: Heart failure (HF) is accompanied by major neuroendocrine changes including the activation of the natriuretic peptide (NP) pathway. Using the unique model of patients undergoing implantation of the CARMAT total artificial heart and investigating regional differences in soluble neprilysin (sNEP) in patients with reduced or preserved systolic function, we studied the regulation of the NP pathway in HF. Methods and results: Venous blood samples from two patients undergoing replacement of the failing ventricles with a total artificial heart were collected before implantation and weekly thereafter until post-operative week 6...
December 13, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29243792/analysis-of-correlation-between-the-mild-cognitive-impairment-mci-and-level-of-adiponectin-in-elderly-patients-with-type-2-diabetes-mellitus-t2dm
#7
Z-Q Liu, M-X Zhang, J Wang, N Ding
OBJECTIVE: To investigate the correlation between the mild cognitive impairment (MCI) and serum level of adiponectin in elderly patients with Type II diabetes mellitus (T2DM), so as to provide evidence for early diagnosis of MCI and effective evaluation of the impairment of cognitive functions, thereby preventing the impairment of cognitive function as early as possible. PATIENTS AND METHODS: Clinical data were collected from 260 T2DM patients (≥ 60 years old) in Endocrine Department and 120 healthy subjects (≥ 60 years old) who underwent physical examination in our hospital between June 2015 and June 2017...
December 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29243482/glycosyl-bunte-salts-a-class-of-intermediates-for-sugar-chemistry
#8
Yasuhiro Meguro, Masato Noguchi, Gefei Li, Shin-Ichiro Shoda
S-Glycosyl thiosulfates have been discovered as a new class of synthetic intermediates in sugar chemistry, named "glycosyl Bunte salts" after 19th-century German chemist, Hans Bunte. The synthesis was achieved by direct condensation of unprotected sugars and sodium thiosulfate using a formamidine-type dehydrating agent in water-acetonitrile mixed solvent. The application of glycosyl Bunte salts is demonstrated with transformation reactions into other glycosyl compounds such as a 1-thio sugar, a glycosyl disulfide, a 1,6-anhydro sugar, and an O-glycoside...
December 15, 2017: Organic Letters
https://www.readbyqxmd.com/read/29242757/differential-gene-transcription-of-extracellular-matrix-components-in-response-to-in-vivo-corneal-crosslinking-cxl-in-rabbit-corneas
#9
Sabine Kling, Arthur Hammer, Emilio A Torres Netto, Farhad Hafezi
Purpose: We studied changes in gene transcription after corneal crosslinking (CXL) in the rabbit cornea in vivo and identified potential molecular signaling pathways. Methods: A total of 15 corneas of eight male New-Zealand-White rabbits were de-epithelialized and equally divided into five groups. Group 1 served as an untreated control. Groups 2 to 5 were soaked with 0.1% riboflavin for 20 minutes, which in Groups 3 to 5 was followed by UV-A irradiation at a fluence of 5...
December 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29242193/crystal-structure-of-murine-4-1bb-and-its-interaction-with-4-1bbl-support-a-role-for-galectin-9-in-4-1bb-signaling
#10
Aruna Bitra, Tzanko Doukov, Jing Wang, Gaelle Picarda, Chris A Benedict, Michael Croft, Dirk M Zajonc
4-1BB (CD137) is a TNF receptor superfamily (TNFRSF) member that is thought to undergo receptor trimerization upon binding to its trimeric TNF superfamily ligand (4-1BBL) to stimulate immune responses. 4-1BB also can bind to the tandem repeat-type lectin Galectin-9 (Gal-9), and signaling through mouse (m)4-1BB is reduced in Galectin-9 (Gal-9) deficient mice, suggesting a pivotal role of Gal-9 in m4-1BB activation. Here, using sulfur-SAD phasing, we determined the crystal structure of m4-1BB to 2.2 Å resolution...
December 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29242189/secreted-heme-peroxidase-from-dictyostelium-discoideum-insights-into-catalysis-structure-and-biological-role
#11
Andrea Nicolussi, Joe Dan Dunn, Georg Mlynek, Marzia Bellei, Marcel Zámocký, Gianantonio Battistuzzi, Kristina Djinovic-Carugo, Paul G Furtmüller, Thierry Soldati, Christian Obinger
Oxidation of halides and thiocyanate by heme peroxidases to antimicrobial oxidants is an important cornerstone in the innate immune system of mammals. Interestingly, phylogenetic and physiological studies suggest that homologous peroxidases are already present in mycetozoan eukaryotes such as Dictyostelium discoideum This social amoeba kills bacteria via phagocytosis for nutrient acquisition at its single-cell stage and for antibacterial defense at its multicellular stages. Here we demonstrate that peroxidase A from D...
December 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29242038/nmr-based-phytochemical-analysis-of-vitis-vinifera-cv-falanghina-leaves-characterization-of-a-previously-undescribed-biflavonoid-with-antiproliferative-activity
#12
Luciana Tartaglione, Angelita Gambuti, Paola De Cicco, Giuseppe Ercolano, Angela Ianaro, Orazio Taglialatela-Scafati, Luigi Moio, Martino Forino
Vitis vinifera cv Falanghina is an ancient grape variety of Southern Italy. A thorough phytochemical analysis of the Falanghina leaves was conducted to investigate its specialised metabolite content. Along with already known molecules, such as caftaric acid, quercetin-3-O-β-d-glucopyranoside, quercetin-3-O-β-d-glucuronide, kaempferol-3-O-β-d-glucopyranoside and kaempferol-3-O-β-d-glucuronide, a previously undescribed biflavonoid was identified. For this last compound, a moderate bioactivity against metastatic melanoma cells proliferation was discovered...
December 11, 2017: Fitoterapia
https://www.readbyqxmd.com/read/29242020/selective-inhibition-of-%C3%AE-n-acetylhexosaminidases-by-thioglycosyl-naphthalimide-hybrid-molecules
#13
Wei Chen, Shengqiang Shen, Lili Dong, Jianjun Zhang, Qing Yang
To develop selective inhibitors for β-N-acetylhexosaminidases which are involved in a myriad of physiological processes, a series of novel thioglycosyl-naphthalimide hybrid inhibitors were designed, synthesized and evaluated for inhibition activity against glycosyl hydrolase family 20 and 84 (GH20 and GH84) β-N-acetylhexosaminidases. These compounds which incorporate groups with varied sizes and lengths at the linker region between thioglycosyl moiety and naphthalimide moiety are designed to improve the selectivity and stacking interactions...
November 28, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29241843/quantifying-the-effect-of-diabetes-on-surgical-hand-and-forearm-infections
#14
Ketan Sharma, Deng Pan, James Friedman, Jenny L Yu, Aaron Mull, Amy M Moore
PURPOSE: Diabetes has long been established as a risk factor for hand and forearm infections. The purpose of this study was to review the effect of glycemic factors on outcomes among diabetic patients with surgical upper-extremity infections. We hypothesized that diabetic inpatients may benefit from stronger peri-infection glycemic control. METHODS: A prospective cohort study enrolled diabetic and nondiabetic surgical hand and forearm infections over 3 years. Glycemic factors included baseline glycosylated hemoglobin, blood glucose (BG) at presentation, and inpatient BG...
December 11, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29241533/a-small-molecule-oligosaccharyltransferase-inhibitor-with-pan-flaviviral-activity
#15
Andreas S Puschnik, Caleb D Marceau, Yaw Shin Ooi, Karim Majzoub, Natalie Rinis, Joseph N Contessa, Jan E Carette
The mosquito-borne flaviviruses include important human pathogens such as dengue, Zika, West Nile, and yellow fever viruses, which pose a serious threat for global health. Recent genetic screens identified endoplasmic reticulum (ER)-membrane multiprotein complexes, including the oligosaccharyltransferase (OST) complex, as critical flavivirus host factors. Here, we show that a chemical modulator of the OST complex termed NGI-1 has promising antiviral activity against flavivirus infections. We demonstrate that NGI-1 blocks viral RNA replication and that antiviral activity does not depend on inhibition of the N-glycosylation function of the OST...
December 12, 2017: Cell Reports
https://www.readbyqxmd.com/read/29241485/normal-ldl-cholesterol-levels-are-associated-with-subclinical-atherosclerosis-in-the-absence-of-risk%C3%A2-factors
#16
Leticia Fernández-Friera, Valentín Fuster, Beatriz López-Melgar, Belén Oliva, José M García-Ruiz, José Mendiguren, Héctor Bueno, Stuart Pocock, Borja Ibáñez, Antonio Fernández-Ortiz, Javier Sanz
BACKGROUND: Absence of cardiovascular risk factors (CVRFs) is traditionally considered low risk for atherosclerosis; however, individuals without CVRFs, as currently defined, still have events. OBJECTIVES: This study sought to identify predictors of subclinical atherosclerosis in CVRF-free individuals. METHODS: Participants from the PESA (Progression of Early Subclinical Atherosclerosis) study (n = 4,184) without conventional CVRFs were evaluated (n = 1,779; 45...
December 19, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29240734/transient-expression-of-human-antibodies-in-mammalian-cells
#17
Rodrigo Vazquez-Lombardi, Damien Nevoltris, Ansha Luthra, Peter Schofield, Carsten Zimmermann, Daniel Christ
Recombinant expression of antibody molecules in mammalian cells offers important advantages over traditionally utilized bacterial expression, including glycosylation required for antibody functionality and markedly reduced levels of endotoxin contamination. Advances in transient mammalian expression systems enable high yields (>100 mg/liter) that now allow for effective recombinant antibody production at a reasonable cost. Here, we provide step-by-step protocols for the design and recombinant expression of full-length IgG antibodies and antibody-derived constructs (including Fab, Fc-fusions and bispecifics) in mammalian cells...
January 2018: Nature Protocols
https://www.readbyqxmd.com/read/29239840/therapeutic-monoclonal-antibody-n-glycosylation-structure-function-and-therapeutic-potential
#18
REVIEW
Florian Cymer, Hermann Beck, Adelheid Rohde, Dietmar Reusch
Therapeutic antibodies (IgG-type) contain several post-translational modifications (PTMs) whereby introducing a large heterogeneity, both structural and functional, into this class of therapeutics. Of these modifications, glycosylation in the fragment crystallizable (Fc) region is the most heterogeneous PTM, which can affect the stability of the molecule and interactions with Fc-receptors in vivo. Hence, the glycoform distribution can affect the mode of action and have implications for bioactivity, safety and efficacy of the drug...
November 24, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/29239667/the-prevalence-of-radiological-glenohumeral-osteoarthritis-in-long-term-type-1-diabetes-the-dialong-shoulder-study
#19
N G Juel, J I Brox, J C Hellund, K B Holte, T J Berg
OBJECTIVES: This study compares the prevalence of radiological osteoarthritis (OA) in patients with type 1 diabetes mellitus (DM1) for > 45 years and controls, and explores the association with shoulder pain and glycaemic burden in patients with DM1. METHOD: The Dialong study is a cross-sectional, observational study with 30 years of historical data on long-term glycaemic control. We included 102 patients with DM1 and 73 diabetes-free controls. Demographic data, worst shoulder pain last week [numeric rating scale (NRS) 0-10], pain on abduction at examination (NRS 0-10), and current and historical glycosylated haemoglobin (HbA1c) levels were collected...
December 14, 2017: Scandinavian Journal of Rheumatology
https://www.readbyqxmd.com/read/29239606/biosurfactant-protein-interaction-in%C3%AF-uences-of-mannosylerythritol-lipids-a-on-%C3%AE-glucosidase
#20
Linlin Fan, Pu-Jun Xie, Ying Wang, Zisu Huang, Jianzhong Zhou
In this work, the influences of a biosurfactant, mannosylerythritol lipids-A (MEL-A) towards β-glucosidase activity and their molecular interactions were studied by using differential scanning calorimetry (DSC), circular dichroism spectroscopy (CD), isothermal titration calorimetry (ITC) and docking simulation. The enzyme inhibition kinetics data showed that MEL-A at a low concentration (< CMC, 20.0±5.0 μM) enhanced β-glucosidase activity, whereas it inhibited the enzyme activity at higher concentrations more than 20...
December 14, 2017: Journal of Agricultural and Food Chemistry
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