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Fucosylation

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https://www.readbyqxmd.com/read/28196353/importance-of-screening-for-esophagogastric-varices-in-na%C3%A3-ve-hepatocellular-carcinoma-patients-within-milan-criteria-indicator-for-liver-transplantation
#1
Takamasa Kawakami, Atsushi Hiraoka, Kojiro Michitaka, Tomoyuki Ninomiya, Masashi Hirooka, Yoichi Hiasa
BACKGROUND/AIMS: Patients with hepatocellular carcinoma (HCC) beyond Milan criteria (MC) are not eligible for liver transplantation (LT). To elucidate prognostic factors significantly linked to recurrence beyond MC or death related to the liver, we evaluated the clinical features in a series of HCC patients within MC at baseline. METHODS: We enrolled 255 naïve HCC patients (≤70 years) within the MC who underwent upper-gastrointestinal-endoscopy, and were treated with resection or radiofrequency ablation (62 years old [median]; male:female = 202:53; Child-Pugh A:B = 216:39)...
February 15, 2017: Digestive Surgery
https://www.readbyqxmd.com/read/28192913/identification-of-lewis-and-blood-group-carbohydrate-epitopes-by-ion-mobility-tandem-mass-spectrometry-fingerprinting
#2
Johanna Hofmann, Alexandra Stuckmann, Max Crispin, David J Harvey, Kevin Pagel, Weston B Struwe
Glycans have several elements that contribute to their structural complexity, involving a range of monosaccharide building blocks, configuration of linkages between residues and various degrees of branching on a given structure. Their analysis remains challenging and resolving minor isomeric variants can be difficult, in particular terminal fucosylated Lewis and blood group antigens present on N- and O-glycans. Accurately characterizing these isomeric structures by current techniques is not straightforward and typically requires a combination of methods and/or sample derivatization...
February 1, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192904/high-resolution-glycan-analysis-by-temperature-gradient-capillary-electrophoresis
#3
Marton Szigeti, Andras Guttman
Temperature gradient capillary electrophoresis was introduced to enhance separation selectivities for branched glycans of biotherapeutic interest. A mixture of afucosylated, fucosylated, and high mannose oligosaccharides was separated in the range of 15 to 45 °C at 5 °C temperature intervals. It was found that within this temperature range, the separation selectivity was carbohydrate structure dependent. The resolution between some glycan structures was greater at elevated temperatures, while others separated better at lower temperatures...
February 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28186328/site-specific-monitoring-of-n-glycosylation-profiles-of-a-ctla4-fc-fusion-protein-from-the-secretory-pathway-to-the-extracellular-environment
#4
Karina Bora de Oliveira, David Spencer, Christopher Barton, Nitin Agarwal
Glycosylation often plays a key role in the safety and efficacy of therapeutic proteins to patients, thus underlying the need for consistent control of this important post-translational modification during biologics production. In this study, we profiled the site-specific evolution of N-glycans on a CTLA4-Fc-fusion protein, from the intracellular secretory pathway to the conditioned medium (CM) in fed-batch cell culture. For this, we developed an approach that combined sub-cellular fractionation with liquid chromatography-tandem mass spectrometry (LC-MS/MS) analyses...
February 10, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28179425/structural-insights-into-the-broad-substrate-specificity-of-a-novel-endo-glycoceramidase-i-belonging-to-a-new-subfamily-of-gh5-glycosidase
#5
Yun-Bin Han, Liu-Qing Chen, Zhuo Li, Yu-Meng Tan, Yan Feng, Guang-Yu Yang
Endoglycoceramidases (EGCases) specifically hydrolyze the glycosidic linkage between the oligosaccharide and the ceramide moieties of various glycosphingolipids, and they have received substantial attention in the emerging field of glycosphingolipidology. However, the mechanism regulating the strict substrate specificity of these GH5 glycosidases has not been identified. In this study, we report a novel EGCase I from Rhodococcus equi 103S (103S_EGCase I) with remarkably broad substrate specificity. Based on phylogenetic analyses, the enzyme may represent a new subfamily of GH5 glycosidases...
February 8, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28177462/mouse-intestinal-niche-cells-express-a-distinct-%C3%AE-1-2-fucosylated-glycan-recognized-by-a-lectin-from-burkholderia-cenocepacia
#6
Daisuke Sugahara, Yuka Kobayashi, Yoshihiro Akimoto, Hayato Kawakami
No abstract text is available yet for this article.
March 15, 2017: Glycobiology
https://www.readbyqxmd.com/read/28176809/unusual-life-cycle-and-impact-on-microfibril-assembly-of-adamts17-a-secreted-metalloprotease-mutated-in-genetic-eye-disease
#7
Dirk Hubmacher, Michael Schneider, Steven J Berardinelli, Hideyuki Takeuchi, Belinda Willard, Dieter P Reinhardt, Robert S Haltiwanger, Suneel S Apte
Secreted metalloproteases have diverse roles in the formation, remodeling, and the destruction of extracellular matrix. Recessive mutations in the secreted metalloprotease ADAMTS17 cause ectopia lentis and short stature in humans with Weill-Marchesani-like syndrome and primary open angle glaucoma and ectopia lentis in dogs. Little is known about this protease or its connection to fibrillin microfibrils, whose major component, fibrillin-1, is genetically associated with ectopia lentis and alterations in height...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28172774/dop036-the-therapeutic-efficacy-of-anti-tnf-requires-fc-gamma-receptors-and-can-be-improved-by-antibody-hypo-fucosylation
#8
F Bloemendaal, A Levin, M Wildenberg, P Koelink, R Visser, J Claassens, M Bradford, G D'Haens, S Verbeek, G Vidarsson, G van den Brink
No abstract text is available yet for this article.
February 1, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28170415/characterization-of-recombinant-human-lactoferrin-n-glycans-expressed-in-the-milk-of-transgenic-cows
#9
Annabelle Le Parc, Sercan Karav, Camille Rouquié, Elizabeth A Maga, Apichaya Bunyatratchata, Daniela Barile
Lactoferrin (LF) is one of the most abundant bioactive glycoproteins in human milk. Glycans attached through N-glycosidic bonds may contribute to Lactoferrin functional activities. In contrast, LF is present in trace amounts in bovine milk. Efforts to increase LF concentration in bovine milk led to alternative approaches using transgenic cows to express human lactoferrin (hLF). This study investigated and compared N-glycans in recombinant human lactoferrin (rhLF), bovine lactoferrin (bLF) and human lactoferrin by Nano-LC-Chip-Q-TOF Mass Spectrometry...
2017: PloS One
https://www.readbyqxmd.com/read/28169190/galactosylation-and-sialylation-levels-of-igg-predict-relapse-in-patients-with-pr3-anca-associated-vasculitis
#10
Michael J Kemna, Rosina Plomp, Pieter van Paassen, Carolien A M Koeleman, Bas C Jansen, Jan G M C Damoiseaux, Jan Willem Cohen Tervaert, Manfred Wuhrer
OBJECTIVE: The objective of our study is to investigate the Fc glycosylation profiles of both antigen-specific IgG targeted against proteinase 3 (PR3-ANCA) and total IgG as prognostic markers of relapse in patients with Granulomatosis with Polyangiitis (GPA). METHODS: Seventy-five patients with GPA and a PR3-ANCA rise during follow-up were included, of whom 43 patients relapsed within a median period of 8 (2-16) months. The N-glycan at Asn297 of affinity-purified and denatured total IgG and PR3-ANCA was determined by mass spectrometry of glycopeptides in samples obtained at the time of the PR3-ANCA rise and at the time of the relapse or time-matched during remission...
January 28, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28153461/purification-structural-characterization-and-anticoagulant-properties-of-fucosylated-chondroitin-sulfate-isolated-from-holothuria-mexicana
#11
Jiaojiao Mou, Cong Wang, Wenjing Li, Jie Yang
A novel fucosylated chondroitin sulfate (HmG) was isolated from sea cucumber Holothuria mexicana, the structure of which was characterized by monosaccharide composition, disaccharide composition, IR, (1)H and (13)C NMR spectrum, additionally with two dimensional NMR spectrum of degraded HmG (DHmG). The backbone of HmG was identified as chondroitin 6-O sulfate, while the major O-4 sulfated fucose branches linked to O-3 position of glucuronic acid in almost every disaccharide unit. The anticoagulant activities of HmG and DHmG were assessed and compared with heparin and low molecular weight heparin...
January 30, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28151933/specific-anti-glycan-antibodies-are-sustained-during-and-after-parasite-clearance-in-schistosoma-japonicum-infected-rhesus-macaques
#12
Y Y Michelle Yang, Xiao Hong Li, Katarzyna Brzezicka, Niels-Christian Reichardt, R Alan Wilson, Angela van Diepen, Cornelis H Hokke
BACKGROUND: Human immunity to Schistosoma infection requires many years of exposure, and multiple infections and treatments to develop. Unlike humans, rhesus macaques clear an established schistosome infection naturally at the same time acquiring immunity towards re-infection. In macaques, schistosome egg production decreases after 8 weeks post-infection and by week 22, physiological impairment of the worm caused by unclarified antibody-mediated processes is observed. Since strong antibody responses have been observed against schistosome glycan antigens in human and animal infections, we here investigate if anti-glycan antibodies are associated with immunity against schistosome infections in macaques...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28138383/systematic-chemoenzymatic-synthesis-of-o-sulfated-sialyl-lewis-x-antigens
#13
Abhishek Santra, Hai Yu, Nova Tasnima, Musleh M Muthana, Yanhong Li, Jie Zeng, Nicholas J Kenyond, Angelique Y Louie, Xi Chen
O-Sulfated sialyl Lewis x antigens play important roles in nature. However, due to their structural complexity, they are not readily accessible by either chemical or enzymatic synthetic processes. Taking advantage of a bacterial sialyltransferase mutant that can catalyze the transfer of different sialic acid forms from the corresponding sugar nucleotide donors to Lewis x antigens which are fucosylated glycans as well as an efficient one-pot multienzyme (OPME) sialylation system, O-sulfated sialyl Lewis x antigens containing different sialic acid forms and O-sulfation at different locations were systematically synthesized by chemoenzymatic methods...
April 1, 2016: Chemical Science
https://www.readbyqxmd.com/read/28103512/protein-o-fucosyltransferase-1-promotes-trophoblast-cell-proliferation-through-activation-of-mapk-and-pi3k-akt-signaling-pathways
#14
Chang Liu, Xiaohua Liang, Jiao Wang, Qin Zheng, Yue Zhao, Muhammad Noman Khan, Shuai Liu, Qiu Yan
Protein O-fucosylation is an important glycosylation modification and plays an important role in embryonic development. Protein O-fucosyltransferase 1 (poFUT1) is an essential enzyme that catalyzes the synthesis of protein O-fucosylation. Our previous studies showed that poFUT1 promoted trophoblast cell migration and invasion at the fetal-maternal interface, but the role of poFUT1 in trophoblast cells proliferation remains unclear. Here, immunohistochemistry data showed that poFUT1 and PCNA levels were decreased in abortion patient's trophoblasts compared with women with normal pregnancies...
January 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28102426/improved-anticoagulant-effect-of-fucosylated-chondroitin-sulfate-orally-administered-as-gastro-resistant-tablets
#15
Roberto J C Fonseca, Isabela D Sucupira, Stephan Nicollas M C G Oliveira, Gustavo R Santos, Paulo A S Mourão
Fucosylated chondroitin sulfate (FucCS) is a potent anticoagulant polysaccharide extracted from sea cucumber. Its anticoagulant activity is attributed to the presence of unique branches of sulfated fucose. Although this glycosaminoglycan exerts an antithrombotic effect following oral administration, high doses are necessary to achieve the maximum effect. The diminished activity of FucCS following oral administration is likely due to its degradation in the gastrointestinal tract and its limited ability to cross the intestinal cell membranes...
January 19, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28077298/the-underestimated-n-glycomes-of-lepidopteran-species
#16
Rhiannon Stanton, Alba Hykollari, Barbara Eckmair, Daniel Malzl, Martin Dragosits, Dieter Palmberger, Ping Wang, Iain B H Wilson, Katharina Paschinger
BACKGROUND: Insects are significant to the environment, agriculture, health and biotechnology. Many of these aspects display some relationship to glycosylation, e.g., in case of pathogen binding or production of humanised antibodies; for a long time, it has been considered that insect N-glycosylation potentials are rather similar and simple, but as more species are glycomically analysed in depth, it is becoming obvious that there is indeed a large structural diversity and interspecies variability...
January 8, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28029136/application-of-lectin-array-technology-for-biobetter-characterization-its-correlation-with-fc%C3%AE-riii-binding-and-adcc
#17
Markus Roucka, Klaus Zimmermann, Markus Fido, Andreas Nechansky
Lectin microarray technology was applied to compare the glycosylation pattern of the monoclonal antibody MB311 expressed in SP2.0 cells to an antibody-dependent cellular cytotoxic effector function (ADCC)-optimized variant (MB314). MB314 was generated by a plant expression system that uses genetically modified moss protoplasts (Physcomitrella patens) to generate a de-fucosylated version of MB311. In contrast to MB311, no or very low interactions of MB314 with lectins Aspergillus oryzae l-fucose (AOL), Pisum sativum agglutinin (PSA), Lens culinaris agglutinin (LCA), and Aleuria aurantia lectin (AAL) were observed...
December 24, 2016: Microarrays
https://www.readbyqxmd.com/read/28011641/glycan-bound-to-the-selectin-low-affinity-state-engages-glu-88-to-stabilize-the-high-affinity-state-under-force
#18
Padmaja Mehta-D'souza, Arkadiusz G Klopocki, Vaheh Oganesyan, Simon Terzyan, Timothy Mather, Zhenhai Li, Sumith R Panicker, Cheng Zhu, Rodger P McEver
Selectin interactions with fucosylated glycan ligands mediate leukocyte rolling in the vasculature under shear forces. Crystal structures of P- and E-selectin suggest a two-state model in which ligand binding to the lectin domain closes loop 83-89 around the Ca(2+) coordination site, enabling Glu-88 to engage Ca(2+) and fucose. This triggers further allostery that opens the lectin/EGF domain hinge. The model posits that force accelerates transition from the bent (low affinity) to the extended (high affinity) state...
February 10, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28010766/heterologous-expression-in-pichia-pastoris-and-characterization-of-a-%C3%AE-glucosidase-from-the-xylophagous-cockroach-panesthia-angustipennis-spadica-displaying-high-specific-activity-for-cellobiose
#19
Yihai Li, Gaku Arakawa, Gaku Tokuda, Hirofumi Watanabe, Manabu Arioka
A β-glucosidase (BG), PaBG1b, from the xylophagous cockroach Panesthia angustipennis spadica was heterologously expressed in the methylotrophic yeast Pichia pastoris, purified, and biochemically characterized. Post-translational modification and N-terminal sequencing analysis demonstrated that the expression product was comprised of two polypeptides with different N-terminal sequences, presumably due to the presence of lysine-arginine (KR) sequence in the putative mature region. Substrate specificity analysis showed that PaBG1b hydrolyzed a broad range of substrates including cellohexaose, with the preference for aryl β-d-fucosyl linkage and laminaribiose...
February 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28008329/maternal-and-fetal-mechanisms-of-b-cell-regulation-during-pregnancy-human-chorionic-gonadotropin-stimulates-b-cells-to-produce-il-10%C3%A2-while-alpha-fetoprotein-drives-them-into-apoptosis
#20
Franziska Fettke, Anne Schumacher, Andrea Canellada, Natalia Toledo, Isabelle Bekeredjian-Ding, Albert Bondt, Manfred Wuhrer, Serban-Dan Costa, Ana Claudia Zenclussen
Maternal immune tolerance toward the fetus is an essential requisite for pregnancy. While T cell functions are well documented, little is known about the participation of B cells. We have previously suggested that IL-10-producing B cells are involved in pregnancy tolerance in mice and humans. By employing murine and human systems, we report now that fetal trophoblasts positively regulate the generation of IL-10-producing B cells. We next studied the participation of hormones produced by the placenta as well as the fetal protein alpha-fetoprotein (AFP) in B cell modulation...
2016: Frontiers in Immunology
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