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Glycopeptide

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https://www.readbyqxmd.com/read/28644609/galnac-tyrosine-is-a-ligand-of-plant-lectins-antibodies-and-human-and-murine-macrophage-galactose-type-lectins
#1
Ruslan Gibadullin, David Wayne Farnsworth, Joseph J Barchi, Jeffrey C Gildersleeve
In 2011, a new type of protein O-glycosylation was discovered in which N-acetylgalactosamine is attached to the side chain of tyrosine (GalNAc-Tyr). While present on dozens of proteins, the biological roles of GalNAc-Tyr are unknown. To gain insight into this new type of modification, we synthesized a group of GalNAc-Tyr glycopeptides, constructed microarrays, and evaluated potential recognition of GalNAc-Tyr by a series of glycan-binding proteins. Through a series of >150 microarray experiments, we assessed binding properties of a variety of plant lectins, monoclonal antibodies, and endogenous lectins...
June 23, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28639641/incorporation-of-click-chemistry-glycomimetics-dramatically-alters-triple-helix-stability-in-an-adiponectin-model-peptide
#2
Katherine R Lutteroth, Paul W R Harris, Tom H Wright, Harveen Kaur, Kevin Sparrow, Sung-Hyun Yang, Garth J S Cooper, Margaret A Brimble
Adiponectin (Adpn) has been shown to be a possible therapeutic for Type II diabetes, however the production of a therapeutic version of Adpn has proved to be challenging. Biological studies have highlighted the importance of the glycosylated lysine residues for the formation of bioactive high molecular weight oligomers of Adpn. Through the use of 'click' glycopeptide mimetics, we investigated the role of glycosylated lysine and serine residues for the formation of triple helical structures of the collagenous domain of Adpn, in the context of a collagen model peptide scaffold...
June 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28631638/clinicomicrobiological-profile-of-endophthalmitis-a-10-year-experience-in-a-tertiary-care-center-in-north-india
#3
Gita Satpathy, Niranjan Nayak, Meenakshi Wadhwani, Pradeep Venkwatesh, Atul Kumar, Yograj Sharma, Vishnu Sreenivas
PURPOSE: To determine the clinicomicrobiological profile of infectious agents and their antibiotic susceptibility in different type of endophthalmitis. METHODS: A retrospective review of clinical and microbiological records from January 2001 to December 2010, was performed in 1110 patients diagnosed with different type of endophthalmitis (postoperative, posttraumatic, endogenous and post keratitis) to record the demographic details, clinical presentations; microbiological agents isolated with their antimicrobial sensitivity pattern...
April 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28631328/phenotypic-characterisation-of-coagulase-negative-staphylococci-isolated-from-blood-cultures-in-newborn-infants-with-a-special-focus-on-staphylococcus-capitis
#4
Gustaf Ehlersson, Bengt Hellmark, Olov Svartström, Bianca Stenmark, Bo Söderquist
AIM: This Swedish study determined which species of coagulase-negative staphylococci (CoNS) were found in neonatal blood cultures and whether they included Staphylococcus capitis clones with decreased susceptibility to vancomycin. METHODS: CoNS isolates (n=332) from neonatal blood cultures collected at Örebro University Hospital during 1987-2014 were identified to species level with matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS)...
June 20, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28630087/paucimannose-rich-n-glycosylation-of-spatiotemporally-regulated-human-neutrophil-elastase-modulates-its-immune-functions
#5
Ian Loke, Ole Østergaard, Niels H H Heegaard, Nicolle H Packer, Morten Thaysen-Andersen
Human neutrophil elastase (HNE) is an important N-glycosylated serine protease in the innate immune system, but the structure and immune-modulating functions of HNE N-glycosylation remain undescribed. Herein, LC-MS/MS-based glycan, glycopeptide and glycoprotein profiling were utilised to first determine the heterogeneous N-glycosylation of HNE purified from neutrophil lysates and then from isolated neutrophil granules of healthy individuals. The spatiotemporal expression of HNE during neutrophil activation and the biological importance of its N-glycosylation were also investigated using immunoblotting, cell surface capture, native MS, receptor interaction, protease inhibition, and bacteria growth assays...
June 19, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28627880/site-specific-fucosylation-analysis-identifies-glycoproteins-associated-with-aggressive-prostate-cancer-cell-lines-using-tandem-affinity-enrichments-of-intact-glycopeptides-followed-by-mass-spectrometry
#6
Jianliang Zhou, Weiming Yang, Yingwei Hu, Naseruddin Hoti, Yang Liu, Punit Shah, Shisheng Sun, David J Clark, Stefani N Thomas, Hui Zhang
Fucosylation (Fuc) of glycoproteins plays an important role in regulating protein function and has been associated with the development of several cancer types including prostate cancer (Pca). Therefore, the research of Fuc glycoproteins has attracted increasing attention recently in analytical field. Herein, a strategy based on lectin affinity enrichments of intact glycopeptides followed by mass spectrometry has been established to evaluate the specificities of various Fuc-binding lectins for glycosite-specific Fuc analysis of non-aggressive (NAG) and aggressive (AG) Pca cell lines...
June 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28627758/spectral-library-based-glycopeptide-analysis-detection-of-circulating-galectin-3-binding-protein-in-pancreatic-cancer
#7
Eslam N Nigjeh, Ru Chen, Yasuko Allen-Tamura, Randall E Brand, Teresa A Brentnall, Sheng Pan
PURPOSE: Pancreatic ductal adenocarcinoma (PDAC) is a lethal disease characterized by its late diagnosis, poor prognosis and rapid development of drug resistance. Using the data independent acquisition (DIA) technique, we applied a spectral library-based proteomic approach to analyze N-glycosylated peptides in human plasma, in the context of pancreatic cancer study. EXPERIMENTAL DESIGN: We extended the application of DIA to the quantification of N-glycosylated peptides enriched from plasma specimens from a clinically well-defined cohort that consists of patients with early stage PDAC, chronic pancreatitis and healthy subjects...
June 19, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/28626548/nonomuraea-sp-atcc-55076-harbours-the-largest-actinomycete-chromosome-to-date-and-the-kistamicin-biosynthetic-gene-cluster
#8
Behnam Nazari, Clarissa C Forneris, Marcus I Gibson, Kyuho Moon, Kelsey R Schramma, Mohammad R Seyedsayamdost
Glycopeptide antibiotics (GPAs) have served as potent clinical drugs and as an inspiration to chemists in various disciplines. Among known GPAs, complestatin, chloropeptin, and kistamicin are unique in that they contain an unusual indole-phenol crosslink. The mechanism of formation of this linkage is unknown, and to date, the biosynthetic gene cluster of only one GPA with an indole-phenol crosslink, that of complestatin, has been identified. Here, we report the genome sequence of the kistamicin producer Nonomuraea sp...
April 1, 2017: MedChemComm
https://www.readbyqxmd.com/read/28623326/sialic-acid-linkage-differentiation-of-glycopeptides-using-capillary-electrophoresis-electrospray-ionization-mass-spectrometry
#9
Guinevere S M Kammeijer, Bas C Jansen, Isabelle Kohler, Anthonius A M Heemskerk, Oleg A Mayboroda, Paul J Hensbergen, Julie Schappler, Manfred Wuhrer
Sialylation is a glycosylation feature that occurs in different linkages at the non-reducing end of a glycan moiety, the linkage isomers are often differentially associated with various biological processes. Due to very similar physico-chemical properties, the separation of isomeric sialylated glycopeptides remains challenging but of utmost importance in the biomedicine and biotechnology, including biomarker discovery, glyco-engineering and biopharmaceutical characterization. This study presents the implementation of a high-resolution separation platform based on capillary electrophoresis - mass spectrometry (CE-MS) allowing for the selective analysis of α2,3- and α2,6-sialylated glycopeptides...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621608/glycosylation-change-of-alpha-1-acid-glycoprotein-as-a-serum-biomarker-for-hepatocellular-carcinoma-and-cirrhosis
#10
Delin Zhang, Jianzhao Huang, Dan Luo, Xinfu Feng, Yan Liu, Yan Liu
AIM: This research is to explore the glycosylation change of alpha-1-acid glycoprotein (AGP) in hepatocellular carcinoma (HCC), cirrhosis and controls. METHODS: The affinity chromatography and lectin affinity techniques were used to separate and enrich glycosylated AGP, and combined with mass spectrometry to identify and relatively quantify the glycopeptides from AGP. RESULTS: The sialylation and fucosylation of AGP were different among HCC, cirrhosis and controls...
May 2017: Biomarkers in Medicine
https://www.readbyqxmd.com/read/28620376/the-n-glycosylation-of-mouse-immunoglobulin-g-igg-fragment-crystallizable-differs-between-igg-subclasses-and-strains
#11
Noortje de Haan, Karli R Reiding, Jasminka Krištić, Agnes L Hipgrave Ederveen, Gordan Lauc, Manfred Wuhrer
N-linked glycosylation of the fragment crystallizable (Fc)-region of immunoglobulin G (IgG) is known to have a large influence on the activity of the antibody, an effect reported to be IgG subclass specific. This situation applies both to humans and mice. The mouse is often used as experimental animal model to study the effects of Fc-glycosylation on IgG effector functions, and results are not uncommonly translated back to the human situation. However, while human IgG Fc-glycosylation has been extensively characterized in both health and disease, this is not the case for mice...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28617578/antibodies-against-specific-muc16-glycosylation-sites-inhibit-ovarian-cancer-growth
#12
Thapi Dharma Rao, Alberto Fernández-Tejada, Abram Axelrod, Nestor Rosales, Xiujun Yan, Sahityasri Thapi, Amy Wang, Kay J Park, Brandon Nemieboka, Jingyi Xiang, Jason S Lewis, Nariso Olvera, Douglas A Levine, Samuel J Danishefsky, David Spriggs
Expression of the retained C-terminal extracellular portion of the ovarian cancer glycoprotein MUC16 induces transformation and tumor growth. However, the mechanisms of MUC16 oncogenesis related to glycosylation are not clearly defined. We establish that MUC16 oncogenic effects are mediated through MGAT5-dependent N-glycosylation of two specific asparagine sites within its 58 amino acid ectodomain. Oncogenic signaling from the C-terminal portion of MUC16 requires the presence of Galectin-3 and growth factor receptors co-localized on lipid rafts...
June 15, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28610952/structural-diversity-of-marine-cyclic-peptides-and-their-molecular-mechanisms-for-anticancer-antibacterial-antifungal-and-other-clinical-applications
#13
REVIEW
Yeji Lee, Chanvorleak Phat, Soon-Cheol Hong
Many cyclic peptides and analogues derived from marine sources are known to possess biological properties, including anticancer, antitumor, antibacterial, antifungal, antiparasitic, anti-inflammation, anti-proliferative, anti-hypertensive, cytotoxic, and antibiotic properties. These compounds demonstrate different activities and modes of action according to their structure such as cyclic oligopeptide, cyclic lipopeptide, cyclic glycopeptide and cyclic depsipeptide. The recent advances in application of the above-mentioned cyclic peptides were reported in dolastatins, soblidotin, didemnin B, aplidine, salinosporamide A, kahalalide F and bryostatin 1 and they are currently in clinical trials...
June 10, 2017: Peptides
https://www.readbyqxmd.com/read/28609623/single-step-enrichment-of-n-glycopeptides-and-phosphopeptides-with-novel-multifunctional-ti4-immobilized-dendritic-polyglycerol-coated-chitosan-nanomaterials
#14
Xiajuan Zou, Jianzheng Jie, Bin Yang
Protein glycosylation and phosphorylation, two of the most important post-translational modifications (PTMs) in the proteome play a vital role in regulating a number of complex biological processes and involvement in a variety of diseases. Comprehensive characterization of the phosphoproteome and glycoproteome requires highly specific and sensitive enrichment methods for purification of phosphopeptides and glycopeptides because many glycoproteins and phosphoproteins naturally occur at low abundances and substoichiometry...
June 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28602507/designed-synthesis-of-ultra-hydrophilic-sulfo-functionalized-metal-organic-frameworks-with-a-magnetic-core-for-highly-efficient-enrichment-of-the-n-linked-glycopeptides
#15
Yiqin Xie, Chunhui Deng, Yan Li
Highly efficient extraction and enrichment of the N-linked glycopeptides from complex biological samples before mass spectrometry analysis remains important but challenging, due to the low abundance and suppression by proteins and salts. Herein, a facile route to an ultra-hydrophilic metal-organic frameworks (MOFs)-functionalized magnetic nanoparticle (Fe3O4@PDA@Zr-SO3H) was proposed. The as-prepared MOFs was endowed with excellent and unique properties, such as excellent hydrophilicity, ultrahigh surface area, and strong magnetic responsiveness...
May 26, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28587447/identification-of-n-glycosites-in-chicken-egg-white-proteins-using-an-omics-strategy
#16
Fang Geng, Jinqiu Wang, Dayu Liu, Yongguo Jin, Meihu Ma
Chicken egg white (CEW) is a perfect source of natural proteins that possesses outstanding functional properties and various bioactivities. The glycosylation structure of CEW proteins plays important roles in their functions, bioactivities, and allergies. The present work attempted to identify N-glycosites of CEW proteins using an omics strategy. CEW proteins were digested with trypsin and chymotrypsin; glycopeptides were enriched and deglycosylated using PNGase F in H2(18)O water, followed by analysis using high-performance liquid chromatography/tandem mass spectrometry (HPLC-MS/MS)...
June 21, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28580785/applications-of-nonenzymatic-catalysts-to-the-alteration-of-natural-products
#17
Christopher R Shugrue, Scott J Miller
The application of small molecules as catalysts for the diversification of natural product scaffolds is reviewed. Specifically, principles that relate to the selectivity challenges intrinsic to complex molecular scaffolds are summarized. The synthesis of analogues of natural products by this approach is then described as a quintessential "late-stage functionalization" exercise wherein natural products serve as the lead scaffolds. Given the historical application of enzymatic catalysts to the site-selective alteration of complex molecules, the focus of this Review is on the recent studies of nonenzymatic catalysts...
June 5, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28579308/a-dual-functional-peptide-auxiliary-conjugate-for-c-to-n-and-n-to-c-sequential-native-chemical-ligation-of-glycopeptides
#18
Claudia Bello, Christian F W Becker
Long, homogeneously glycosylated peptides and proteins can be assembled from multiple segments via sequential chemoselective reactions. The efficiency of the synthesis depends on the effectiveness and number of steps and on their compatibility with glycosylation methods. Here, we present how the combination of auxiliary-mediated native chemical ligation and thioester generation via hydrazinolysis from Wang-type resin enables multiple, sequential N-to-C and C-to-N ligations. The method can be applied to glycosylated peptides and peptide α-thioesters and has the potential to be further extended to sequential glycosylation, thus paving the way to the synthesis of complex homogeneous glycoproteins...
May 22, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28577308/empirical-antibiotics-targeting-gram-positive-bacteria-for-the-treatment-of-febrile-neutropenic-patients-with-cancer
#19
REVIEW
Ofrat Beyar-Katz, Yaakov Dickstein, Sara Borok, Liat Vidal, Leonard Leibovici, Mical Paul
BACKGROUND: The pattern of infections among neutropenic patients with cancer has shifted in the last decades to a predominance of gram-positive infections. Some of these gram-positive bacteria are increasingly resistant to beta-lactams and necessitate specific antibiotic treatment. OBJECTIVES: To assess the effectiveness of empirical anti-gram-positive (antiGP) antibiotic treatment for febrile neutropenic patients with cancer in terms of mortality and treatment failure...
June 3, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28573434/the-whole-price-of-vancomycin-toxicities-troughs-and-time
#20
Meghan N Jeffres
Vancomycin is a glycopeptide antibiotic that is active against Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus. Nephrotoxicity, which is usually reversible, is the most serious common adverse effect of vancomycin. Vancomycin-associated nephrotoxicity prolongs hospital stays, imposes a need for additional antibiotics and, in rare circumstances, dialysis treatment, and increases medical costs and mortality. Risk factors for nephrotoxicity include the dose and duration of vancomycin treatment, serum trough concentration, patient characteristics, and concomitant receipt of nephrotoxins...
June 1, 2017: Drugs
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