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https://www.readbyqxmd.com/read/29138239/expanding-the-chondroitin-glycoproteome-of-caenorhabditis-elegans
#1
Fredrik Noborn, Alejandro Gomez Toledo, Waqas Nasir, Jonas Nilsson, Tabea Dierker, Lena Kjellén, Göran Larson
Chondroitin sulfate proteoglycans (CSPGs) are important structural components of connective tissues in essentially all metazoan organisms. In vertebrates, CSPGs are involved also in more specialized processes such as neurogenesis and growth factor signaling. In invertebrates, however, knowledge of CSPGs core proteins and proteoglycan-related functions is relatively limited, even for Caenorhabditis elegans. This nematode produces large amounts of non-sulfated chondroitin in addition to low-sulfated chondroitin sulfate chains...
November 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29136858/monoclonal-antibody-n-glycosylation-profiling-using-capillary-electrophoresis-mass-spectrometry-assessment-and-method-validation
#2
Jérémie Giorgetti, Valentina D'Atri, Julie Canonge, Antony Lechner, Davy Guillarme, Olivier Colas, Elsa Wagner-Rousset, Alain Beck, Emmanuelle Leize-Wagner, Yannis-Nicolas François
Characterization of therapeutic proteins represents a major challenge for analytical sciences due to their heterogeneity caused by post-translational modifications (PTM). Among these PTM, glycosylation which is possibly the most prominent, require comprehensive identification because of their major influence on protein structure and effector functions of monoclonal antibodies (mAbs). As a consequence, glycosylation profiling must be deeply characterized. For this application, several analytical methods such as separation-based or MS-based methods, were evaluated...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29131156/impact-of-choice-timing-sequence-and-combination-of-broad-spectrum-antibiotics-on-the-outcome-of-allogeneic-haematopoietic-stem-cell-transplantation
#3
F Farowski, V Bücker, J J Vehreschild, L Biehl, R Cruz-Aguilar, C Scheid, U Holtick, N Jazmati, H Wisplinghoff, O A Cornely, M J G T Vehreschild
Recent data link the incidence of intestinal GvHD (iGvHD) after allogeneic haematopoietic stem cell transplantation (aSCT) to exposure with piperacillin-tazobactam or imipenem-cilastatin. To assess relevance of timing, duration, sequence and combination of antibiotic treatment in this setting, we applied a time-dependent model to our aSCT cohort. Patients from the prospective Cologne Cohort of Neutropenic Patients (CoCoNut) undergoing aSCT from January 2007 to April 2013 were included into a time-dependent multivariate Cox proportional hazards regression model with backward-stepwise selection...
November 13, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/29130774/the-sweet-spot-for-biologics-recent-advances-in-characterization-of-biotherapeutic-glycoproteins
#4
Rόisín O'Flaherty, Irena Trbojević-Akmačić, Gordon Greville, Pauline M Rudd, Gordan Lauc
Glycosylation is recognized as a Critical Quality Attribute for therapeutic glycoproteins such as monoclonal antibodies, fusion proteins and therapeutic replacement enzymes. Hence, efficient and quantitative glycan analysis techniques have been increasingly important for their discovery, development and quality control. The aim of this review is to highlight relevant and recent advances in analytical technologies for characterization of biotherapeutic glycoproteins. Areas covered: The review gives an overview of the glycosylation trends of biotherapeutics approved in 2016 and 2017 by FDA...
November 13, 2017: Expert Review of Proteomics
https://www.readbyqxmd.com/read/29125896/an-in-situ-dynamic-continuum-of-supramolecular-phosphoglycopeptides-enables-formation-of-3d-cell-spheroids
#5
Huaimin Wang, Junfeng Shi, Zhaoqianqi Feng, Rong Zhou, Shiyu Wang, Avital A Rodal, Bing Xu
Higher-order assemblies of proteins, with a structural and dynamic continuum, is a new paradigm in biology, but these insights have yet to be applied in designing biomaterials. Dynamic assemblies of supramolecular phosphoglycopeptides (sPGPs) transform a 2D cell sheet to 3D cell spheroids. A ligand-receptor interaction between a glycopeptide and a phosphopeptide produces sPGPs that form nanoparticles, which transform to nanofibrils upon partially enzymatic dephosphorylation. The assemblies form dynamically and hierarchically in situ on the cell surface, and interact with extracellular matrix molecules and effectively abolish contact inhibition of locomotion (CIL) of the cells...
November 10, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29120508/synthesis-and-immunological-evaluation-of-a-multicomponent-cancer-vaccine-candidate-containing-a-long-muc1-glycopeptide
#6
Geert-Jan Boons, Nitin T Supekar, Vani Lakshminarayanan, Chantelle J Capicciotti, Anju Sirohiwal, Cathy S Madsen, Margreet A Wolfert, Peter A Cohen, Sandra J Gendler
A fully synthetic MUC1-based cancer vaccine has been designed and chemically synthesized that contains an endogenous helper T-epitope (MHC class II epitope). The vaccine elicited robust IgG titers that could neutralize cancer cells by antibody-dependent cell-mediated cytotoxicity (ADCC). It also activated cytotoxic T-lymphocytes and collectively the immunological data demonstrate engagement of helper T-cells in immune activation. A synthetic methodology was developed for a penta-glycosylated MUC1 glycopeptide and anti-sera of mice immunized by the new vaccine recognized such a structure...
November 9, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29119999/ion-mobility-resolved-collision-induced-dissociation-and-electron-transfer-dissociation-of-n-glycopeptides-gathering-orthogonal-connectivity-information-from-a-single-mass-selected-precursor-ion-population
#7
Venkata Kolli, Katherine N Schumacher, Eric D Dodds
Glycopeptide-level mass spectrometry (MS) and tandem mass spectrometry (MS/MS) analyses are commonly performed to establish site-specific protein glycosylation profiles that are of central importance to gaining structure-function insights on glycoproteins. Confoundingly, the complete characterization of glycopeptide connectivity usually requires the acquisition of multiple MS/MS fragmentation spectra. Complementary ion fragmentation techniques such as collision-induced dissociation (CID) and electron transfer dissociation (ETD) are often applied in concert to address this need...
November 9, 2017: Analyst
https://www.readbyqxmd.com/read/29119059/the-bacteriological-profile-of-the-burned-patients-in-the-center-of-burns-in-chu-mohamed-vi-marrakech-about-123-cases
#8
Yassine Benchamkha, Ouafaa Dhaidah, Adil Dahazze, Quaboul Meriem, Moulay Driss Elamrani, Salwa Ettalbi
The bacterial nosocomial infection is one of the leading causes of morbidity and mortality for burned patient; we conducted a retrospective study of 123 patients hospitalized in the burns center CHUMED VI of Marrakechover a period of 3 years, from January 1(st), 2013 to December 31(st), 2016. The criteria for nosocomial infection were those of the Center for Disease Control in Atlanta in 1988. Incidence rates were calculated. The bacterial ecology of the department was described as also antibiotype. The predominancy of the population was male...
2017: International Journal of Burns and Trauma
https://www.readbyqxmd.com/read/29113996/characterization-of-the-molecular-mechanisms-underlying-glucose-stimulated-insulin-secretion-from-isolated-pancreatic-%C3%AE-cells-using-ptmomics
#9
Taewook Kang, Pia Jensen, Honggang Huang, Gitte Lund Christensen, Nils Billestrup, Martin R Larsen
Normal pancreatic islet β-cells (PBCs) abundantly secrete insulin in response to elevated blood glucose levels, in order to maintain an adequate control of energy balance and glucose homeostasis. However, the molecular mechanisms underlying the insulin secretion are unclear. Improving our understanding of glucose-stimulated insulin secretion (GSIS) mechanisms under normal conditions is a prerequisite for developing better interventions against diabetes. Here, we aimed at identifying novel signaling pathways involved in the initial release of insulin from PBCs after glucose stimulation using quantitative strategies for the assessment of phosphorylated proteins and sialylated N-linked (SA) glycoproteins...
November 7, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/29110415/structural-and-functional-studies-of-differentially-o-glycosylated-analogs-of-a-thrombin-inhibitory-peptide-variegin
#10
Pidathala R V Shabareesh, Ashish Kumar, Dinakar M Salunke, Kanwal J Kaur
Variegin is a 32-amino acid long thrombin inhibitory peptide isolated from the salivary gland extract of tropical bont tick Amblyomma variegatum. It was identified to be O-glycosylated on its Thr-14 side chain, and this glycosylated form was 14-fold more potent than that of its non-glycosylated form. However, as the identity of this glycosylation remained elusive, the mechanistic details underlying its functional impact are not yet known. In this report, we synthesized four different O-glycosylated analogs of variegin bearing physiologically relevant sugars on its Thr-14...
November 7, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/29107699/synthetic-three-component-hiv-1-v3-glycopeptide-immunogens-induce-glycan-dependent-antibody-responses
#11
Hui Cai, Jared Orwenyo, John P Giddens, Qiang Yang, Roushu Zhang, Celia C LaBranche, David C Montefiori, Lai-Xi Wang
Eliciting broadly neutralizing antibody (bNAb) responses against HIV-1 is a major goal for a prophylactic HIV-1 vaccine. One approach is to design immunogens based on known broadly neutralizing epitopes. Here we report the design and synthesis of an HIV-1 glycopeptide immunogen derived from the V3 domain. We performed glycopeptide epitope mapping to determine the minimal glycopeptide sequence as the epitope of V3-glycan-specific bNAbs PGT128 and 10-1074. We further constructed a self-adjuvant three-component immunogen that consists of a 33-mer V3 glycopeptide epitope, a universal T helper epitope P30, and a lipopeptide (Pam3CSK4) that serves as a ligand of Toll-like receptor 2...
October 4, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/29096185/improved-isolation-and-characterization-procedure-of-sialylglycopeptide-from-egg-yolk-powder
#12
Lin Liu, Anthony R Prudden, Gerlof P Bosman, Geert-Jan Boons
Sialylglycopeptide (SGP) is a complex bi-antennary N-glycan bearing a short peptide fragment that can be isolated from the yolk of hen eggs. This natural product has gained popularity as a starting material for the semi-synthesis of N-glycans. We have found that current isolation methods provide a glycopeptide contaminated with several related structures, one being a glycopeptide having a hexose directly attached to peptide backbone, most like through the hydroxyl containing side chain of the threonine moiety...
November 27, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/29079115/molecular-characterization-of-glycopeptide-and-macrolide-resistance-genes-among-multidrug-resistant-enterococcus-faecalis-strains
#13
Asieh Taji, Hadi Sedigh Ebrahim-Saraie, Hossein Kazemian, Hamid Heidari
BACKGROUND: Multiple-drug-resistant enterococci and vancomycin-resistant enterococci (VRE) are major cause of healthcare associated infections due to their antibiotic resistance traits. Among the enterococci, Enterococcus faecalis is an important opportunistic pathogen causing various hospital-acquired infections. METHODS: A total of 51 E. faecalis strains were isolated from urinary tract infections (UTIs), bloodstream infections, respiratory tract infections, abdominal infections, and eye infection...
October 24, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29077384/modeling-glyco-collagen-conjugates-using-host-guest-strategy-to-alter-phenotypic-cell-migration-and-in-vivo-wound-healing
#14
Sivakoti Sangabathuni, Raghavendra Vasudeva Murthy, Madhuri Gade, Harikrishna Bavireddi, Suraj Toraskar, Mahesh V Sonar, Krishna N Ganesh, Raghavendra Kikkeri
The constructs and study of combinatorial libraries of structurally defined homologs extracellular matrix (ECM) glycopeptides can significantly accelerate the identification of cell surface markers involved in a variety of physiological and pathological processes. Herein, we present a simple and reliable host-guest approach to design high-throughput glyco-collagen library to modulate the primary and secondary cell lines migration process. 4-Amidoadamantyl-substituted collagen peptides and β-cyclodextrin (β-CD) appended with mono or disaccharides were used to construct self-assembled glyco-collagen conjugates (GCC) which were found to be thermally stable, with a triple helix structures and nanoneedles-like morphologies that altered cell migration processes...
October 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/29072130/glycoprotein-ca19-9-specific-monoclonal-antibodies-recognize-sialic-acid-independent-glycotope
#15
Manoj Chugh, Vladimir Piskarev, Oxana Galanina, Nailya Khasbiullina, Pallavi Kadam, Nadezhda Shilova, Galina Pazynina, Kira Dobrochaeva, Paresh Bhanushali, Nikolay Kozlov, Nikolay Tupitsin, Nicolai Bovin
A repertoire of monoclonal antibodies was generated by immunization of mice with cancer-associated glycoprotein CA19.9, and two of them were selected as optimal capture and detecting counterparts for sandwich test system for detection of CA19.9. Fine epitope specificity of the antibodies was determined using printed glycan array, enzyme-linked immunosorbent assay, and inhibitory enzyme-linked immunosorbent assay. Unexpectedly, both immunoglobulins did not bind key epitope of CA19.9 glycoprotein, tetrasaccharide SiaLe(A), as well as its defucosylated form sialyl Le(C) (known as CA-50 epitope)...
October 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/29069609/development-of-a-data-independent-acquisition-mass-spectrometry-workflow-to-enable-glycopeptide-analysis-without-predefined-glycan-compositional-knowledge
#16
Chi-Hung Lin, Christoph Krisp, Nicolle H Packer, Mark P Molloy
Glycoproteomics investigates glycan moieties in a site specific manner to reveal the functional roles of protein glycosylation. Identification of glycopeptides from data-dependent acquisition (DDA) relies on high quality MS/MS spectra of glycopeptide precursors and often requires manual validation to ensure confident assignments. In this study, we investigated pseudo-MRM (MRM-HR) and data-independent acquisition (DIA) as alternative acquisition strategies for glycopeptide analysis. These approaches allow data acquisition over the full MS/MS scan range allowing data re-analysis post-acquisition, without data re-acquisition...
October 22, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/29067987/toxigenic-clostridium-difficile-isolates-from-clinically-significant-diarrhoea-in-patients-from-a-tertiary-care-centre
#17
Meenakshi Singh, Chetana Vaishnavi, Rakesh Kochhar, Safrun Mahmood
BACKGROUND & OBJECTIVES: Clostridium difficile is the primary cause of hospital-acquired colitis in patients receiving antibiotics. The pathogenicity of the organism is mainly due to the production of toxins. This study was conducted to investigate the presence of toxigenic C. difficile in the faecal samples of hospitalized patients suspected to have C. difficile infection (CDI) and corroborating the findings with their clinical and demographic data. METHODS: Diarrhoeic samples obtained from 1110 hospitalized patients were cultured for C...
June 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/29065342/synthesis-of-lewis-x-o-core-1-threonine-a-building-block-for-o-linked-lewis-x-glycopeptides
#18
Mohammed Y R Sardar, Venkata R Krishnamurthy, Simon Park, Appi Reddy Mandhapati, Walter J Wever, Dayoung Park, Richard D Cummings, Elliot L Chaikof
Lewis(X) (Le(X)) is a branched trisaccharide Galβ1→4(Fucα1→3)GlcNAc that is expressed on many cell surface glycoproteins and plays critical roles in innate and adaptive immune responses. However, efficient synthesis of glycopeptides bearing Le(X) remains a major limitation for structure-function studies of the Le(X) determinant. Here we report a total synthesis of a Le(X) pentasaccharide 1 using a regioselective 1-benzenesulfinyl piperidine/triflic anhydride promoted [3 + 2] glycosylation. The presence of an Fmoc-threonine amino acid facilitates incorporation of the pentasaccharide in solid phase peptide synthesis, providing a route to diverse O-linked Le(X) glycopeptides...
November 27, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/29063519/clinical-pharmacokinetics-and-pharmacodynamics-of-oxazolidinones
#19
REVIEW
Claire Roger, Jason A Roberts, Laurent Muller
Oxazolidinones are a class of synthetic antimicrobial agents with potent activity against a wide range of multidrug-resistant Gram-positive pathogens including methicillin-resistant Staphylococcus aureus and vancomycin-resistant enterococci. Oxazolidinones exhibit their antibacterial effects by inhibiting protein synthesis acting on the ribosomal 50S subunit of the bacteria and thus preventing formation of a functional 70S initiation complex. Currently, two oxazolidinones have been approved by the US Food and Drug Administration: linezolid and more recently tedizolid...
October 23, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/29063318/method-of-selection-of-bacteria-antibiotic-resistance-genes-based-on-clustering-of-similar-nucleotide-sequences
#20
I S Balashov, V A Naumov, P I Borovikov, A B Gordeev, D V Dubodelov, L A Lyubasovskaya, Yu V Rodchenko, A A Bystritskii, N V Aleksandrova, D Yu Trofimov, T V Priputnevich
A new method for selection of bacterium antibiotic resistance genes is proposed and tested for solving the problems related to selection of primers for PCR assay. The method implies clustering of similar nucleotide sequences and selection of group primers for all genes of each cluster. Clustering of resistance genes for six groups of antibiotics (aminoglycosides, β-lactams, fluoroquinolones, glycopeptides, macrolides and lincosamides, and fusidic acid) was performed. The method was tested for 81 strains of bacteria of different genera isolated from patients (K...
October 2017: Bulletin of Experimental Biology and Medicine
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