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Glycobiology

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https://www.readbyqxmd.com/read/30535277/identification-of-abnormal-fucosylated-glycans-recognized-by-ltl-in-saliva-of-hbv-induced-chronic-hepatitis-cirrhosis-and-hepatocellular-carcinoma
#1
Jiaxu Zhang, Yaogang Zhong, Peixin Zhang, Haoqi Du, Jian Shu, Xiawei Liu, Hua Zhang, Yonghong Guo, Zhansheng Jia, Lili Niu, Fuquan Yang, Zheng Li
The hepatitis B virus (HBV)-induced chronic liver diseases are serious health threats worldwide. There is evidence to display the alterations of salivary N-linked glycans related to the development of HBV-infected liver diseases. Here, we further investigated the alterations of fucosylated N/O-glycans recognized by LTL in saliva from 120 subjects (30 healthy volunteers (HV), 30 patients with hepatitis B (HB), 30 patients with hepatic cirrhosis (HC), and 30 patients with hepatocellular carcinoma (HCC)) using salivary microarrys and MALDI-TOF/TOF-MS...
December 7, 2018: Glycobiology
https://www.readbyqxmd.com/read/30508096/analysis-of-differential-expression-of-glycosyltransferases-in-healing-corneas-by-glycogene-microarrays
#2
Chandrassegar Saravanan, Zhiyi Cao, Steven R Head, Noorjahan Panjwani
No abstract text is available yet for this article.
December 1, 2018: Glycobiology
https://www.readbyqxmd.com/read/30496416/in-vitro-acellular-method-to-reveal-o-fucosylation-on-egf-like-domains
#3
Florian Pennarubia, Emilie Pinault, Abderrahman Maftah, Sébastien Legardinier
A hundred of human proteins have one or more EGF-like domains (EGF-LD) bearing the O-fucosylation consensus motif C2X4(S/T)C3 but to date, only a few of them have been shown to be O-fucosylated. The protein O-fucosyltransferase (POFUT1) specifically recognizes correctly folded EGF-LD of the human EGF (hEGF) type and transfers fucose on serine or threonine residue within the O-fucosylation motif. Here, we propose a strategy for a rapid screening for ability of any EGF-LD to be O-fucosylated, using copper-catalyzed azide-alkyne cycloaddition (CuAAC)...
November 29, 2018: Glycobiology
https://www.readbyqxmd.com/read/30476082/globo-series-glycosphingolipids-enhance-toll-like-receptor-4-mediated-inflammation-and-play-a-pathophysiological-role-in-diabetic-nephropathy
#4
Takahiro Nitta, Hirotaka Kanoh, Kei-Ichiro Inamori, Akemi Suzuki, Tomoko Takahashi, Jin-Ichi Inokuchi
Alteration of glycosphingolipid (GSL) expression plays key roles in the pathogenesis and pathophysiology of many important human diseases, including cancer, diabetes, and glycosphingolipidosis. Inflammatory processes are involved in development and progression of diabetic nephropathy, a major complication of type 2 diabetes mellitus. GSLs are known to play roles in inflammatory responses in various diseases, and levels of renal GSLs are elevated in mouse models of diabetic nephropathy; however, little is known regarding the pathophysiological role of these GSLs in this disease process...
November 22, 2018: Glycobiology
https://www.readbyqxmd.com/read/30476078/transcriptional-activation-of-fucosyltransferase-fut-genes-using-the-crispr-dcas9-vpr-technology-reveals-potent-n-glycome-alterations-in-colorectal-cancer-cells
#5
A Blanas, L A M Cornelissen, M Kotsias, J C van der Horst, H J van de Vrugt, H Kalay, D I R Spencer, R P Kozak, S J van Vliet
Aberrant fucosylation in cancer cells is considered as a signature of malignant cell transformation and it is associated with tumor progression, metastasis and resistance to chemotherapy. Specifically, in colorectal cancer cells, increased levels of the fucosylated Lewisx antigen are attributed to the deregulated expression of pertinent fucosyltransferases, like fucosyltransferase 4 (FUT4) and fucosyltransferase 9 (FUT9). However, the lack of experimental models closely mimicking cancer-specific regulation of fucosyltransferase gene expression has, so far, limited our knowledge regarding the substrate specificity of these enzymes and the impact of Lewisx synthesis on the glycome of colorectal cancer cells...
November 22, 2018: Glycobiology
https://www.readbyqxmd.com/read/30445613/udp-n-acetylglucosamine-dolichyl-phosphate-n-acetylglucosaminephosphotransferase-is-indispensable-for-oogenesis-oocyte-to-embryo-transition-and-larval-development-of-the-nematode-caenorhabditis-elegans
#6
Nanako Kanaki, Ayako Matsuda, Katsufumi Dejima, Daisuke Murata, Kazuko H Nomura, Takashi Ohkura, Keiko-Gengyo Ando, Sawako Yoshina, Shohei Mitani, Kazuya Nomura
N-linked glycosylation of proteins is the most common post-translational modification of proteins. The enzyme UDP-N-acetylglucosamine-dolichyl-phosphate N-acetylglucosaminephosphotransferase (DPAGT1) catalyses the first step of N-glycosylation, and DPAGT1 knockout is embryonic lethal in mice. In this study, we identified the sole orthologue (algn-7) of the human DPAGT1 in the nematode C. elegans. The gene activity was disrupted by RNAi and deletion mutagenesis, which resulted in larval lethality, defects in oogenesis and oocyte-to-embryo transition...
November 16, 2018: Glycobiology
https://www.readbyqxmd.com/read/30407518/an-efficient-use-of-x-ray-information-homology-modeling-molecular-dynamics-and-knowledge-based-docking-techniques-to-predict-protein-monosaccharide-complexes
#7
Juan I Blanco Capurro, Matias Di Paola, Marcelo Daniel Gamarra, Carlos P Modenutti, Marcelo A Martí
Unraveling the structure of lectin-carbohydrate complexes is vital for understanding key biological recognition processes and development of glycomimetic drugs. Molecular Docking application to predict them is challenging due to their low affinity, hydrophilic nature and ligand conformational diversity. In the last decade several strategies, such as the inclusion of glycan conformation specific scoring functions or our developed solvent-site biased method, have improved carbohydrate docking performance but significant challenges remain, in particular, those related to receptor conformational diversity...
November 8, 2018: Glycobiology
https://www.readbyqxmd.com/read/30388226/letter-to-the-glycoforum-the-lec5-glycosylation-mutant-links-homeobox-genes-with-cholesterol-and-lipid-linked-oligosaccharides
#8
Hua Lu, Adwait Amod Sathe, Chao Xing, Mark A Lehrman
n/a for Glycoforum letter.
November 2, 2018: Glycobiology
https://www.readbyqxmd.com/read/30371779/serine-rich-repeat-protein-adhesins-from-lactobacillus-reuteri-display-strain-specific-glycosylation-profiles
#9
Dimitrios Latousakis, Ridvan Nepravishta, Martin Rejzek, Udo Wegmann, Gwenaelle Le Gall, Devon Kavanaugh, Ian J Colquhoun, Steven Frese, Donald A MacKenzie, Jens Walter, Jesus Angulo, Rob Field, Nathalie Juge
Lactobacillus reuteri is a gut symbiont inhabiting the gastrointestinal tract of numerous vertebrates. The surface-exposed Serine-Rich Repeat Protein (SRRP) is a major adhesin in Gram-positive bacteria. Using lectin and sugar nucleotide profiling of wild-type or L. reuteri isogenic mutants, MALDI-ToF-MS, LC-MS and GC-MS analyses of SRRPs, we showed that L. reuteri strains 100-23 C (from rodent) and ATCC 53608 (from pig) can perform protein O-glycosylation and modify SRRP100-23 and SRRP53608 with Hex-Glc-GlcNAc and di-GlcNAc moieties, respectively...
October 27, 2018: Glycobiology
https://www.readbyqxmd.com/read/30383222/galectin-9-induces-atypical-ubiquitination-leading-to-cell-death-in-pc-3-prostate-cancer-cells
#10
Aiko Itoh, Yasuhiro Nonaka, Takashi Ogawa, Takanori Nakamura, Nozomu Nishi
Galectin-9 is the most potent inducer of cell death in lymphomas and other malignant cell types among the members of the galectin family. We investigated the mechanism of galectin-9-induced cell death in PC-3 prostate cancer cells in comparison with in Jurkat T cells. Galectin-9 induced apoptotic cell death in Jurkat cells, as typically revealed by DNA ladder formation. On the other hand, DNA ladder formation and other features of apoptosis were not apparent in PC-3 cells undergoing galectin-9-induced death...
October 24, 2018: Glycobiology
https://www.readbyqxmd.com/read/30346540/elucidation-of-the-o-antigen-structure-of-escherichia-coli-o63
#11
Jonas Ståhle, Carolina Fontana, Andrej Weintraub, Göran Widmalm
The structure of the O-antigen polysaccharide (PS) from the Shiga-toxin producing Escherichia coli O63 has been elucidated using a combination of bioinformatics, component analyses, and NMR spectroscopy. The O-antigen is comprised of tetrasaccharide repeating units with the following structure: →2)-β-d-Quip3N(d-allo-ThrAc)-(1→2)-β-d-Ribf-(1→4)-β-d-Galp-(1→3)-α-d-GlcpNAc-(1→ in which the N-acetylated d-allo-threonine is amide-linked to position 3 of the 3-amino-3-deoxy-d-Quip sugar residue. The presence of a predicted flippase and polymerase encoded in the O63 gene cluster is consistent with the Wzx/Wzy biosynthetic pathway and consequently the biological repeating unit has likely an N-acetyl-d-glucosamine residue at its reducing end...
October 20, 2018: Glycobiology
https://www.readbyqxmd.com/read/30325416/sequence-to-structure-dependence-of-isolated-igg-fc-complex-biantennary-n-glycans-a-molecular-dynamics-study
#12
Aoife M Harbison, Lorna P Brosnan, Keith Fenlon, Elisa Fadda
Fc glycosylation of human immunoglobulins G (IgGs) is essential for their structural integrity and activity. Interestingly, the specific nature of the Fc glycoforms is known to modulate the IgG effector function and inflammatory properties. Indeed, while core-fucosylation of IgG Fc-glycans greatly affects the antibody-dependent cell-mediated cytotoxicity (ADCC) function, with obvious repercussions in the design of therapeutic antibodies, sialylation can reverse the antibody inflammatory response, and galactosylation levels have been linked to aging, to the onset of inflammation, and to the predisposition to rheumatoid arthritis...
October 16, 2018: Glycobiology
https://www.readbyqxmd.com/read/30312397/oligosaccharyltransferase-structures-provide-novel-insight-into-the-mechanism-of-asparagine-linked-glycosylation-in-prokaryotic-and-eukaryotic-cells
#13
Shiteshu Shrimal, Reid Gilmore
Asparagine-linked (N-linked) glycosylation is one of the most common protein modification reactions in eukaryotic cells, occurring upon the majority of proteins that enter the secretory pathway. X-ray crystal structures of the single subunit OSTs from eubacterial and archaebacterial organisms revealed the location of donor and acceptor substrate binding sites and provided the basis for a catalytic mechanism. Cryoelectron microscopy structures of the octameric yeast OST provided substantial insight into the organization and assembly of the multisubunit oligosaccharyltransferases...
October 11, 2018: Glycobiology
https://www.readbyqxmd.com/read/30307501/society-for-glycobiology-awards-2018
#14
(no author information available yet)
No abstract text is available yet for this article.
October 11, 2018: Glycobiology
https://www.readbyqxmd.com/read/30289459/helicobacter-pylori-induces-intracellular-galectin-8-aggregation-around-damaged-lysosomes-within-gastric-epithelial-cells-in-a-host-o-glycan-dependent-manner
#15
Fang-Yen Li, I-Chun Weng, Chun-Hung Lin, Mou-Chieh Kao, Ming-Shiang Wu, Huan-Yuan Chen, Fu-Tong Liu
Galectin-8, a beta-galactoside-binding lectin, is upregulated in the gastric tissues of rhesus macaques infected with Helicobacter pylori. In this study, we found that H. pylori infection triggers intracellular galectin-8 aggregation in human-derived AGS gastric epithelial cells, and that these aggregates colocalize with lysosomes. Notably, this aggregation is markedly reduced following the attenuation of host O-glycan processing. This indicates that H. pylori infection induces lysosomal damage, which in turn results in the accumulation of cytosolic galectin-8 around damaged lysosomes through the recognition of exposed vacuolar host O-glycans...
October 5, 2018: Glycobiology
https://www.readbyqxmd.com/read/30289453/glycoengineered-antibodies-towards-the-next-generation-of-immunotherapeutics
#16
Renato Mastrangeli, Wolf Palinsky, Horst Bierau
Monoclonal antibodies (mAbs) are currently the largest and fastest growing class of biopharmaceuticals, and they address unmet medical needs e.g., in oncology and in auto-immune diseases. Their clinical efficacy and safety is significantly affected by the structure and composition of their glycosylation profile which is commonly heterogeneous, heavily dependent on the manufacturing process, and thus susceptible to variations in the cell culture conditions. Glycosylation is therefore considered a critical quality attribute (CQA) for mAbs...
October 4, 2018: Glycobiology
https://www.readbyqxmd.com/read/30239701/identification-of-key-amino-acid-residues-determining-ligand-binding-specificity-homodimerization-and-cellular-distribution-of-human-galectin-10
#17
Jiyong Su, Chenyang Song, Yunlong Si, Linlin Cui, Tong Yang, Yuying Li, Hao Wang, Guihua Tai, Yifa Zhou
Charcot-Leyden crystal protein/Gal-10, abundantly expressed in eosinophils and basophils, is related to several immune diseases. Recently, crystallographic and biochemical studies showed that Gal-10 cannot bind lactose, because a glutamate residue (Glu33) from another monomer blocks the binding site. Moreover, Gal-10 actually forms a novel dimeric structure compared to other galectins. To investigate the role that Glu33 plays in inhibiting lactose binding, we mutated this residue to glutamine, aspartate, and alanine...
September 20, 2018: Glycobiology
https://www.readbyqxmd.com/read/30239692/a-pipeline-to-translate-glycosaminoglycan-sequences-into-3d-models-application-to-the-exploration-of-glycosaminoglycan-conformational-space
#18
Olivier Clerc, Julien Mariethoz, Alain Rivet, Frédérique Lisacek, Serge Pérez, Sylvie Ricard-Blum
Mammalian glycosaminoglycans are linear complex polysaccharides comprising heparan sulfate, heparin, dermatan sulfate, chondroitin sulfate, keratan sulfate and hyaluronic acid. They bind to numerous proteins and these interactions mediate their biological activities. GAG-protein interaction data reported in the literature are curated mostly in MatrixDB database (http://matrixdb.univ-lyon1.fr/). However, a standard nomenclature and a machine-readable format of GAGs together with bioinformatics tools for mining these interaction data are lacking...
September 18, 2018: Glycobiology
https://www.readbyqxmd.com/read/30544182/meeting-and-course-announcements
#19
(no author information available yet)
No abstract text is available yet for this article.
January 1, 2019: Glycobiology
https://www.readbyqxmd.com/read/30544181/active-site-complementation-and-hexameric-arrangement-in-the-gh-family-29-a-structure-function-study-of-%C3%AE-l-fucosidase-isoenzyme-1-from-paenibacillus-thiaminolyticus
#20
Terézia Kovalová, Tomáš Koval, Eva Benešová, Patricie Vodicková, Vojtech Spiwok, Petra Lipovová, Jan Dohnálek
α-l-Fucosidase isoenzyme 1 from bacterium Paenibacillus thiaminolyticus is a member of the glycoside hydrolase family GH29 capable of cleaving l-fucose from nonreducing termini of oligosaccharides and glycoconjugates. Here we present the first crystal structure of this protein revealing a novel quaternary state within this family. The protein is in a unique hexameric assembly revealing the first observed case of active site complementation by a residue from an adjacent monomer in this family. Mutation of the complementing tryptophan residue caused changes in the catalytic properties including a shift of the pH optimum, a change of affinity to an artificial chromogenic substrate and a decreased reaction rate for a natural substrate...
January 1, 2019: Glycobiology
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