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https://www.readbyqxmd.com/read/29678922/enzymatic-synthesis-of-6-sialyllactose-a-dominant-sialylated-human-milk-oligosaccharide-by-a-novel-exo-%C3%AE-sialidase-from-bacteroides-fragilis-nctc9343
#1
Longcheng Guo, Xiaodi Chen, Li Xu, Min Xiao, Lili Lu
Gut bacteria provide a rich source of glycosidases that can recognize and/or hydrolyze glycans for nutritions. Interestingly, some glycosidases are also found to catalyze transglycosylation reactions in vitro and thus can be used for oligosaccharide synthesis. In this work, six putative and one known exo -α-sialidase genes, including three from Bacteroides fragilis NCTC9343, three from Clostridium perfringens ATCC13124, and one known from Bifidobacterium bifidum JCM1254, were subjected to gene cloning and heterogeneous expression in Escherichia coli The recombinant enzymes were purified, characterized for substrate specificity, and screened for transglycosylation activity...
April 20, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29677181/exploiting-glycan-topography-for-computational-design-of-env-glycoprotein-antigenicity
#2
Wen-Han Yu, Peng Zhao, Monia Draghi, Claudia Arevalo, Christina B Karsten, Todd J Suscovich, Bronwyn Gunn, Hendrik Streeck, Abraham L Brass, Michael Tiemeyer, Michael Seaman, John R Mascola, Lance Wells, Douglas A Lauffenburger, Galit Alter
Mounting evidence suggests that glycans, rather than merely serving as a "shield", contribute critically to antigenicity of the HIV envelope (Env) glycoprotein, representing critical antigenic determinants for many broadly neutralizing antibodies (bNAbs). While many studies have focused on defining the role of individual glycans or groups of proximal glycans in bNAb binding, little is known about the effects of changes in the overall glycan landscape in modulating antibody access and Env antigenicity...
April 20, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29675931/efficacy-studies-of-sclerotium-rolfsii-lectin-on-breast-cancer-using-nod-scid-mouse-model
#3
Prajna Hegde, Jagadeesh Narasimhappagari, Bale M Swamy, Shashikala R Inamdar
Expression of altered glycans like TF, Tn and sTn antigens has been observed in a number of carcinomas which are targeted in cancer therapy. Sclerotium rolfsii lectin (SRL) is known to recognize TF and its substituted forms. Clinical potential of SRL has been demonstrated by studying its interaction with different types of cancer cells. Here we report, in vitro studies of SRL on breast cancer MDA-MB-468 cells and in vivo studies with MCF-7 xenografts. In vitro growth inhibitory studies of SRL on metastatic triple negative breast cancer MDA-MB-468 cells was performed by MTT assay, flow cytometry, adhesion and CAM assay...
April 20, 2018: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/29675741/collision-cross-sections-and-ion-mobility-separation-of-fragment-ions-from-complex-n-glycans
#4
David J Harvey, Yasunori Watanabe, Joel D Allen, Pauline Rudd, Kevin Pagel, Max Crispin, Weston B Struwe
Ion mobility mass spectrometry (IM-MS) holds great potential for structural glycobiology, in particular in its ability to resolve glycan isomers. Generally, IM-MS has largely been applied to intact glycoconjugate ions with reports focusing on the separation of different adduct types. Here, we explore IM separation and report the collision cross section (CCS) of complex type N-glycans and their fragments in negative ion mode following collision-induced dissociation (CID). CCSs of isomeric fragment ions were found, in some cases, to reveal structural details that were not present in CID spectra themselves...
April 19, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29675740/identification-of-poly-n-acetyllactosamine-carrying-glycoproteins-from-hl-60-human-promyelocytic-leukemia-cells-using-a-site-specific-glycome-analysis-method-glyco-ridge
#5
Akira Togayachi, Azusa Tomioka, Mika Fujita, Masako Sukegawa, Erika Noro, Daisuke Takakura, Michiyo Miyazaki, Toshihide Shikanai, Hisashi Narimatsu, Hiroyuki Kaji
To elucidate the relationship between the protein function and the diversity and heterogeneity of glycans conjugated to the protein, glycosylation sites, glycan variation, and glycan proportions at each site of the glycoprotein must be analyzed. Glycopeptide-based structural analysis technology using mass spectrometry has been developed; however, complicated analyses of complex spectra obtained by multistage fragmentation are necessary, and sensitivity and throughput of the analyses are low. Therefore, we developed a liquid chromatography/mass spectrometry (MS)-based glycopeptide analysis method to reveal the site-specific glycome (Glycan heterogeneity-based Relational IDentification of Glycopeptide signals on Elution profile, Glyco-RIDGE)...
April 19, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29675174/a-modular-synthetic-route-to-size-defined-immunogenic-haemophilus-influenzae-b-antigens-is-key-to-the-identification-of-an-octasaccharide-lead-vaccine-candidate
#6
J Y Baek, A Geissner, D C K Rathwell, D Meierhofer, C L Pereira, P H Seeberger
The first glycoconjugate vaccine using isolated glycans was licensed to protect children from Haemophilus influenzae serotype b (Hib) infections. Subsequently, the first semisynthetic glycoconjugate vaccine using a mixture of antigens derived by polymerization targeted the same pathogen. Still, a detailed understanding concerning the correlation between oligosaccharide chain length and the immune response towards the polyribosyl-ribitol-phosphate (PRP) capsular polysaccharide that surrounds Hib remains elusive...
February 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29674747/glycointeractions-in-bacterial-pathogenesis
#7
REVIEW
Jessica Poole, Christopher J Day, Mark von Itzstein, James C Paton, Michael P Jennings
Many important interactions between bacterial pathogens and their hosts are highly specific binding events that involve host or pathogen carbohydrate structures (glycans). Glycan interactions can mediate adhesion, invasion and immune evasion and can act as receptors for toxins. Several bacterial pathogens can also enzymatically alter host glycans to reveal binding targets, degrade the host cell glycans or alter the function of host glycoproteins. In recent years, high-throughput screening technologies, such as lectin, glycan and mucin microarrays, have transformed the field by identifying new bacterial-host glycointeractions, which are crucial for colonization, persistence and disease...
April 19, 2018: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/29674446/polysialic-acid-is-a-cellular-receptor-for-human-adenovirus-52
#8
Annasara Lenman, A Manuel Liaci, Yan Liu, Lars Frängsmyr, Martin Frank, Bärbel S Blaum, Wengang Chai, Iva I Podgorski, Balázs Harrach, Mária Benkő, Ten Feizi, Thilo Stehle, Niklas Arnberg
Human adenovirus 52 (HAdV-52) is one of only three known HAdVs equipped with both a long and a short fiber protein. While the long fiber binds to the coxsackie and adenovirus receptor, the function of the short fiber in the virus life cycle is poorly understood. Here, we show, by glycan microarray analysis and cellular studies, that the short fiber knob (SFK) of HAdV-52 recognizes long chains of α-2,8-linked polysialic acid (polySia), a large posttranslational modification of selected carrier proteins, and that HAdV-52 can use polySia as a receptor on target cells...
April 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29674318/nicotiana-benthamiana-%C3%AE-galactosidase-a1-1-can-functionally-complement-human-%C3%AE-galactosidase-a-deficiency-associated-with-fabry-disease
#9
Kassiani Kytidou, Jules Beekwilder, Marta Artola, Eline van Meel, Ruud H P Wilbers, Geri F Moolenaar, Nora Goosen, Maria J Ferraz, Rebecca Katzy, Patrick Voskamp, Bogdan I Florea, Cornelis H Hokke, Herman S Overkleeft, Arjen Schots, Dirk Bosch, Navraj Pannu, Johannes M F G Aerts
α-Galactosidases (EC 3.2.1.22) are retaining glycosidases that cleave terminal α-linked galactose residues from glycoconjugate substrates. α-Galactosidases take part in the turnover of cell wall-associated galactomannans in plants and in the lysosomal degradation of glycosphingolipids in animals. Deficiency of human α-galactosidase A (α-Gal A) causes Fabry disease (FD), a heritable, X-linked lysosomal storage disorder, characterized by accumulation of globotriaosylceramide (Gb3) and globotriaosylsphingosine (lysoGb3)...
April 19, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29674057/high-resolution-glycoform-profiling-of-intact-therapeutic-proteins-by-hydrophilic-interaction-chromatography-mass-spectrometry
#10
Elena Domínguez-Vega, Sara Tengattini, Claudia Peintner, Jordy van Angeren, Caterina Temporini, Rob Haselberg, Gabriella Massolini, Govert W Somsen
Glycosylation is considered a critical quality attribute of therapeutic proteins. Protein heterogeneity introduced by glycosylation includes differences in the nature, number and position of the glycans. Whereas analysis of released glycans and glycopeptides provides information about the composition and/or position of the glycan, intact glycoprotein analysis allows assignment of individual proteoforms and co-occurring modifications. Yet, resolving protein glycoforms at the intact level is challenging. We have explored the capacity of hydrophilic liquid chromatography-mass spectrometry (HILIC-MS) for assessing glycosylation patterns of intact pharmaceutical proteins by analyzing the complex glycoproteins interferon-beta-1a (rhIFN-β - 1a) and recombinant human erythropoietin (rhEPO)...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674052/glycan-affinity-magnetic-nanoplatforms-for-urinary-glycobiomarkers-discovery-in-bladder-cancer
#11
Rita Azevedo, Janine Soares, Cristiana Gaiteiro, Andreia Peixoto, Luís Lima, Dylan Ferreira, Marta Relvas-Santos, Elisabete Fernandes, Ana Tavares, Sofia Cotton, Ana Luísa Daniel-da-Silva, Lúcio Lara Santos, Rui Vitorino, Francisco Amado, José Alexandre Ferreira
Bladder Cancer (BC) presents one of the highest recurrence rates amongst solid tumours and constitutes the second deadliest disease of the genitourinary track. Non-invasive identification of patients facing disease recurrence and/or progression remains one of the most critical and challenging aspects in disease management. To contribute to this goal, we demonstrate the potential of glycan-affinity glycoproteomics nanoplatforms for urinary biomarkers discovery in bladder cancer. Briefly, magnetic nanoprobes (MNP) coated with three broad-spectrum lectins, namely Concanavalin A (ConA; MNP@ConA), Wheat Germ Agglutinin (WGA; MNP@WGA), and Sambucus nigra (SNA; MNP@SNA), were used to selectively capture glycoproteins from the urine of low-grade and high-grade non-muscle invasive as well as muscle-invasive BC patients...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674015/isomer-specific-profiling-of-n-glycans-derived-from-human-serum-for-potential-biomarker-discovery-in-pancreatic-cancer
#12
Yufei Liu, Chang Wang, Ran Wang, Yike Wu, Liang Zhang, Bi-Feng Liu, Liming Cheng, Xin Liu
Glycosylation is one of the most important post-translational modifications of protein. Recently, global profiling of human serum glycomics has become a noninvasive method for cancer-related biomarker discovery and many studies have focused on compositional glycan profiling. In contrast, structure-specific glycan profiling may provide more potential biomarkers with higher specificity than compositional profiling. In this work, N-glycans released from human serum were neutralized with methylamine and reduced by ammonia-borane complex prior to profiling using nanoLC-ESI-MS with porous graphitized carbon (PGC) and relative abundances of over 280 isomers were compared between pancreatic cancer (PC) cases (n = 32) and healthy controls (n = 32)...
April 16, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29673624/an-efficient-method-to-control-high-mannose-and-core-fucose-levels-in-glycosylated-antibody-production-using-deoxymannojirimycin
#13
Sagit Shalel Levanon, Orit Aharonovitz, Ayelet Maor-Shoshani, Gita Abraham, Dan Kenett, Yehoshua Aloni
Glycosylation on the Fc region of recombinant Immunoglobulin G (IgG) therapeutic antibodies is a critical protein quality attribute which may affect the efficacy and safety of the molecule. During the development of biosimilar therapeutics, adjustment of the glycosylation profile is required in order to match the reference innovator profile. Deoxymannojirimycin (DMJ), a known inhibitor of mannosidase, was used in this study to modulate the glycosylation pattern of antibodies. The effect of DMJ, at concentrations of 5 μM - 500 μM, on non-fucosylated glycoform levels was tested in the biosynthesis processes of two different IgG1 (IgG1 #A and IgG1 #B) using two Chinese hamster ovary (CHO) cell lines (CHO-DXB-11 and CHOK1SV, respectively) in Erlenmeyer flasks and in lab scale bioreactors...
April 16, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29673211/the-role-of-gut-microbiota-in-obesity-and-type-2-and-type-1-diabetes-mellitus-new-insights-into-old-diseases
#14
REVIEW
Igor Alexander Harsch, Peter Christopher Konturek
The investigation of the human microbiome is the most rapidly expanding field in biomedicine. Early studies were undertaken to better understand the role of microbiota in carbohydrate digestion and utilization. These processes include polysaccharide degradation, glycan transport, glycolysis, and short-chain fatty acid production. Recent research has demonstrated that the intricate axis between gut microbiota and the host metabolism is much more complex. Gut microbiota—depending on their composition—have disease-promoting effects but can also possess protective properties...
April 17, 2018: Medical Sciences: Open Access Journal
https://www.readbyqxmd.com/read/29672582/changes-in-n-glycans-of-igg4-and-its-relationship-with-the-existence-of-hypocomplementemia-and-individual-organ-involvement-in-patients-with-igg4-related-disease
#15
Naoki Konno, Mitsuru Sugimoto, Tadayuki Takagi, Makiko Furuya, Tomoyuki Asano, Shuzo Sato, Hiroko Kobayashi, Kiyoshi Migita, Yoshiaki Miura, Taichi Aihara, Atsushi Komatsuda, Hiromasa Ohira, Hiroshi Watanabe
BACKGROUND: Although increased serum IgG4 level and tissue infiltration of IgG4-positive cells are key events in IgG4-related disease (IgG4RD), and nearly half of IgG4RD patients show hypocomplementemia, the role of IgG4 in the pathogenesis of IgG4RD remains unclear. Many reports show that altered IgG glycosylation, especially IgG with agalactosylated N-linked glycan (G0 N-glycan), have proinflammatory roles including complement activation, implicated in the pathogenesis of various inflammatory diseases...
2018: PloS One
https://www.readbyqxmd.com/read/29671762/increased-level-of-%C3%AE-2-6-sialylated-glycans-on-hacat-cells-induced-by-titanium-dioxide-nanoparticles-under-uv-radiation
#16
Yuanyuan Ren, Xin Liu, Runqing Geng, Qunwei Lu, Rong Rao, Xi Tan, Xiangliang Yang, Wei Liu
As one of the most widely used nanomaterials, the safety of nano-TiO₂ for human beings has raised concern in recent years. Sialylation is an important glycosylation modification that plays a critical role in signal transduction, apoptosis, and tumor metastasis. The aim of this work was to investigate the cytotoxicity and phototoxicity of nano-TiO₂ with different crystalline phases for human skin keratinocytes (HaCaT cells) under ultraviolet (UV) irradiation and detect sialic acid alterations. The results showed that the mixture of crystalline P25 had the highest cytotoxicity and phototoxicity, followed by pure anatase A25, whereas pure rutile R25 had the lowest cytotoxicity and phototoxicity...
April 19, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29671580/site-specific-profiling-of-serum-glycoproteins-using-n-linked-glycan-and-glycosite-analysis-reveals-atypical-n-glycosylation-sites-on-albumin-and-alpha-1b-glycoprotein
#17
Shisheng Sun, Yingwei Hu, Li Jia, Shadi Toghi Eshghi, Yang Liu, Punit Shah, Hui Zhang
Most serum proteins are N-linked glycosylated and therefore the glycoproteomic profiling of serum is essential for characterization of serum proteins. In this study, we profiled serum N-glycoproteome by our recently developed N-glycoproteomic method using solid-phase extraction of N-linked Glycans And Glycosite-containing peptides (NGAG) coupled with LC-MS/MS and site-specific glycosylation analysis using GPQuest software. Our data indicated that half of identified N-glycosites were modified by at least two glycans, with a majority of them were sialylated...
April 19, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29671439/maldi-tof-ms-characterization-of-n-linked-glycoprotein-derived-from-ginger-with-ace-inhibitory-activity
#18
Wenzhu Zhao, Yuejiao Chen, Siyu Xue, Zhipeng Yu, Hanjie Yu, Jingbo Liu, Jianrong Li, Feng Chen
Herein, the ability of ginger glycoproteins to inhibit the angiotensin-converting enzyme (ACE) is characterized. The activity is monitored via HPLC, and then the crude glycoproteins are enriched with lectin microarrays and magnetic microspheres. The N-linked glycans released from the enriched glycoproteins by PNGase F are identified by MALDI-TOF-MS. The results suggest that the crude ginger glycoproteins are active against ACE with an IC50 value of 0.83 ± 0.09 mg mL-1. The ginger glycoproteins are enriched by concanavalin A (Con A) and solanum tuberosum (Potato) lectin (STL), and the structures of the N-glycans released from the ginger glycoproteins include high-mannose type glycans, fucosylated-type glycans, and hybrid-type glycans, as analyzed by MALDI-TOF-MS...
April 19, 2018: Food & Function
https://www.readbyqxmd.com/read/29670011/lack-of-the-%C3%AE-1-3-fucosyltransferase-gene-osfuct-affects-anther-development-and-pollen-viability-in-rice
#19
Joon-Soo Sim, Mahipal Singh Kesawat, Manu Kumar, Su-Yeon Kim, Vimalraj Mani, Parthiban Subramanian, Soyoung Park, Chang-Muk Lee, Seong-Ryong Kim, Bum-Soo Hahn
N -linked glycosylation is one of the key post-translational modifications. α1,3-Fucosyltransferase (OsFucT) is responsible for transferring α1,3-linked fucose residues to the glycoprotein N -glycan in plants. We characterized an Osfuct mutant that displayed pleiotropic developmental defects, such as impaired anther and pollen development, diminished growth, shorter plant height, fewer tillers, and shorter panicle length and internodes under field conditions. In addition, the anthers were curved, the pollen grains were shriveled, and pollen viability and pollen number per anther decreased dramatically in the mutant...
April 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29669592/ggdonto-ontology-as-a-knowledge-base-for-genetic-diseases-and-disorders-of-glycan-metabolism-and-their-causative-genes
#20
Elena Solovieva, Toshihide Shikanai, Noriaki Fujita, Hisashi Narimatsu
BACKGROUND: Inherited mutations in glyco-related genes can affect the biosynthesis and degradation of glycans and result in severe genetic diseases and disorders. The Glyco-Disease Genes Database (GDGDB), which provides information about these diseases and disorders as well as their causative genes, has been developed by the Research Center for Medical Glycoscience (RCMG) and released in April 2010. GDGDB currently provides information on about 80 genetic diseases and disorders caused by single-gene mutations in glyco-related genes...
April 18, 2018: Journal of Biomedical Semantics
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