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Jin Yu, Oliver C Grant, Christian Pett, Sabine Strahl, Robert J Woods, Ulrika Westerlind
Mammalian protein O-mannosylation comprise a group of post-translational modifications (PTMs) involved in muscle and brain development. Despite the enormous progress made, to date the biological impact of the mammalian O-mannosyl glycoproteome remains largely unknown. Tools are still needed to investigate the structure, role and abundance of O-mannosyl glycans. While O-mannosyl branching has been shown to be of relevance in integrin-dependent cell-migration, and also plays a role in demyelinating diseases, a broader understanding of the biological roles of branched O-mannosyl glycans is lacking in part due to the paucity of detection tools...
January 12, 2017: Chemistry: a European Journal
M Af Sandeberg, E Johansson, L Wettergren, O Björk, O Hertting, A Nilsson
BACKGROUND: Children undergoing cancer therapy are at risk for infectious complications that require hospitalization and antimicrobial therapy. Host factors such as age and underlying disease may predict the risk of severe infections in these children. To describe the increased morbidity due to infections in children with cancer, we characterized the antibiotic use during the infectious complications in a national cohort of children 7-16 years of age with cancer. PROCEDURE: Data on infectious complications were prospectively collected from the medical records of all newly diagnosed children with cancer, aged 7-16 years, in Sweden between 2004 and 2006...
January 11, 2017: Pediatric Blood & Cancer
Bo Jiang, Qiong Wu, Lihua Zhang, Yukui Zhang
Although selective enrichment of glycopeptides from complex biological samples is indispensable for mass spectrometry (MS)-based glycoproteomics, it still remains a great challenge due to the low abundance of glycoproteins and suppression of non-glycopeptides. In this study, silver nanoparticle-functionalized magnetic graphene oxide nanocomposites (GO/Fe3O4/PEI/Ag) were synthesized. Silver nanoparticles were generated in situ on the surface of magnetic graphene oxide using polyethylenimine as a reducing and stabilizing agent...
January 10, 2017: Nanoscale
Laurent Dortet, Delphine Girlich, Anne-Laure Virlouvet, Laurent Poirel, Patrice Nordmann, Bogdan I Iorga, Thierry Naas
The metallo-β-lactamase NDM-1 is one of the most worrysome resistance determinant that is spreading worldwide spread among Gram-negative bacilli. A bleomycin resistance gene, bleMBL, has been associated quite systematically downstream of the blaNDM-1 gene. Here, we characterized the corresponding protein, BRPMBL, conferring resistance to bleomycin, an antitumoral glycopeptide molecule. We have determined whether the expression of the blaNDM-1-bleMBL operon is inducible in presence of carbapenems and/or bleomycin-like molecules using qRT-PCR, minimal inhibitory concentration determination of imipenem and zeocin, and carbapenemase specific activity assays...
January 9, 2017: Antimicrobial Agents and Chemotherapy
Nianrong Sun, Jiawen Wang, Jizong Yao, Chun-Hui Deng
Hydrophilic interaction liquid chromatography (HILIC) is a significant enrichment strategy in glycoproteomics profiling. In this report, hydrophilic magnetic mesoporous silica materials (Fe3O4@mSiO2-IDA) were designed and synthesized as an outstanding enrichment platform for glycopeptide analysis. By taking advantage of their merits, such as large surface area, excellent hydrophilicity and unbiased affinity toward all types of glycopeptides, the Fe3O4@mSiO2-IDA nanomaterials were successfully applied to capture glycopeptides from complex samples...
January 4, 2017: Analytical Chemistry
Vanessa Leiria Campo, Thalita Riul, Leandro Bortot, Maristela Martins-Teixeira, Marcelo Marchiori, Emanuela Iaccarino, Menotti Ruvo, Marcelo Dias-Baruffi, Ivone Carvalho
This study presents the synthesis of the novel protected O-glycosyl amino acids βGalNAc-SerOBn (1) and βGalNAc-ThrOBn (2) as mimetics of the natural Tn antigen (αGalNAc-Ser/Thr), along with the solid-phase assembly of the glycopeptides NHAcSer-Ala-Pro-Asp-Thr[αGalNAc]-Arg-Pro-Ala-Pro-Gly-BSA (3-BSA) and NHAcSer-Ala-Pro-Asp-Thr[βGalNAc]-Arg-Pro-Ala-Pro-Gly-BSA (4-BSA), bearing αGalNAc-Thr or βGalNAc-Thr, as mimetics of MUC1 tumor mucin glycoproteins. According to ELISA tests, mice immunizations with βGalNAc-glycopeptide 4-BSA induced higher sera titers (1:320000) if compared to immunizations with αGalNAc-glycopeptide 3-BSA (1:40000)...
January 9, 2017: Chembiochem: a European Journal of Chemical Biology
Klaus Villadsen, Manuel C Martos-Maldonado, Knud J Jensen, Mikkel Boas Thygesen
Glycobiology is the comprehensive biological investigation of carbohydrates. The study of the role and function of complex carbohydrates often requires the attachment of carbohydrates to surfaces, their tagging with fluorophores, or conversion into natural or non-natural glycoconjugates, such as glycopeptides or -lipids. Glycobiology and its 'omics', glycomics, require easy and robust chemical methods for the construction of these glycoconjugates. This review gives an overview of the rapidly expanding field of chemical reactions that selectively convert unprotected carbohydrates into glycoconjugates through the anomeric position...
January 9, 2017: Chembiochem: a European Journal of Chemical Biology
Tabata P Cardoso, Larissa A de Sá, Priscila Dos S Bury, Sair M C Pacheco, Marcio V B Dias
Glycopeptides are an important class of antibiotics used in the treatment of several infections, including those ones caused by methicillin resistant Staphylococcus aureus. Glycopeptides are biosynthesized by a Non Ribosomal Peptide Synthase (NRPS) and the resulting peptide precursors are decorated by several tailoring enzymes, such as halogenases and glycosyltransferases. These enzymes are important targets of protein engineering to produce new derivatives of known antibiotics. Herein, we show the production of two putative halogenases, denominated as StaI and StaK involved in the biosynthesis of the glycopeptide A47,934 in Streptomyces toyocaensis NRRL 15,009...
January 5, 2017: Protein Expression and Purification
Bernhard Halfinger, Angelika Hammerer-Lercher, Benno Amplatz, Bettina Sarg, Leopold Kremser, Herbert H Lindner
BACKGROUND: Currently, N-terminal pro-B-type natriuretic peptide (NT-proBNP) and its physiologically active counterpart, BNP, are most frequently used as biomarkers for diagnosis, prognosis, and disease monitoring of heart failure (HF). Commercial NT-proBNP and BNP immunoassays cross-react to varying degrees with unprocessed proBNP, which is also found in the circulation. ProBNP processing and immunoassay response are related to O-linked glycosylation of NT-proBNP and proBNP. There is a clear and urgent need to identify the glycosylation sites in the endogenously circulating peptides requested by the community to gain further insights into the different naturally occurring forms...
January 2017: Clinical Chemistry
D Camacho-Muñoz, B Kasprzyk-Hordern
This paper presents a multi-residue method for direct enantioselective separation of chiral pharmacologically active compounds in environmental matrices. The method is based on chiral liquid chromatography and tandem mass spectrometry detection. Simultaneous chiral discrimination was achieved with a macrocyclic glycopeptide-based column with antibiotic teicoplanin as a chiral selector working under reverse phase mode. For the first time, enantioresolution was reported for metabolites of ibuprofen: carboxyibuprofen and 2-hydroxyibuprofen with this chiral stationary phase...
January 6, 2017: Journal of Mass Spectrometry: JMS
Xiaohong Sun, Michael G Gänzle, Jianping Wu
Ovomucin is a glycoprotein from egg white with potential to act as an anti-adhesive agent against infectious diseases. This study aimed to determine whether ovomucin or ovomucin hydrolysates could prevent adhesion to two porcine K88 enterotoxigenic Escherichia coli (ETEC) strains. Adhesion was determined in vitro using hemagglutination assay. Ovomucin hydrolysates, but not intact ovomucin, prevented ETEC adhesion to porcine erythrocytes. Ovomucin hydrolysate prepared by acid protease II exhibited the best anti-agglutinating activity against both strains; this hydrolysate was fractionated by cation exchange chromatography and reverse-phase HPLC...
January 4, 2017: Journal of Agricultural and Food Chemistry
Becem Trabelsi, Mehdi Trifa, Sonia Ben Khalifa
No abstract text is available yet for this article.
June 2016: La Tunisie Médicale
Yiman Zhao, Yajing Chen, Zhichao Xiong, Xudong Sun, Quanqing Zhang, Yangyang Gan, Lingyi Zhang, Weibing Zhang
In consideration of the close connection between glycopeptides and human diseases, the efficient method to separate and enrich glycopeptides from complex biological samples is urgently required. In the work, we developed a magnetic zwitterionic-hydrophilic material for highly effective separation and analysis of glycopeptides from complex samples. The Fe3O4 particles were covered with a thick layer of polymer by one-step reflux-precipitation polymerization (RPP), subsequently decorated by Au nanoparticles (Au NPs) through in situ reduction and finally modified with zwitterionic groups...
December 19, 2016: Journal of Chromatography. A
Jing Zhang, Liang Qi, Wei-Ting Zheng, Yong-Le Tian, Ai-Ping Chi, Zhi-Qi Zhang
Novel 3-aminophenylboronic acid functionalized poly(glycidyl methacrylate-co-ethylene dimethacrylate) microspheres were prepared for the solid-phase extraction of glycopeptides/glycoproteins. The adsorption efficiency, maximum adsorption capacity, and specific recognition of the microspheres to glycoprotein were investigated. The results indicated excellent adsorption of glycoproteins by the microspheres, which is attributed to the well-defined boronic acid brushes on the microsphere surfaces. Furthermore, a solid-phase extraction microcolumn filled with the microspheres was used to efficiently enrich glycopeptides from enzymatic hydrolysates from human serum samples...
January 3, 2017: Journal of Separation Science
Olivera Djuric, Snezana Jovanovic, Branka Stosovic, Tanja Tosic, Milica Jovanovic, Ljiljana Markovic-Denic
INTRODUCTION: We aimed to report the distribution and resistance patterns of eight invasive clinically relevant bacteria surveyed in the Clinical Center of Serbia (CCS) in Belgrade. METHODOLOGY: A total of 477 clinical blood stream isolates of Staphylococcus aureus, Streptococcus pneumoniae, Enterococcus faecium, Enterococcus faecalis, Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, and Acinetobacter spp. were collected in the period from January to December 2013...
December 30, 2016: Journal of Infection in Developing Countries
Hongqiang Qin, Kai Cheng, Jun Zhu, Jiawei Mao, Fangjun Wang, Mingming Dong, Rui Chen, Zhimou Guo, Xinmiao Liang, Mingliang Ye, Hanfa Zou
The diversity of O-linked glycan structures has drawn increasing attentions due to its vital biological roles. However, intact O-glycopeptides with different glycans are typically not well elucidated using the current methods. In this work, an integrated strategy was developed for comprehensive analysis of O-GalNAc glycosylation by combining hydrophilic interaction chromatography (HILIC) tip enrichment, beam-type collision induced decomposition (beam-CID) detection and in silico deglycosylation method for spectra interpretation...
December 28, 2016: Analytical Chemistry
Saeideh Ashouri, Maryam Hosseindokht Khujin, Mohammad Kazemi, Majid Kheirollahi
BACKGROUND: Teicoplanin is a member of vancomycin-ristocetin family of glycopeptide antibiotics. It mediated wound healing by increasing neovascularization possibly through activation of MAP kinase signaling pathway. The aim of this study is an evaluation of c-myc and c-fos genes expression after treatment of cells by teicoplanin and determines whether this glycopeptide antibiotic exerts its proliferation effects by influencing the expression of these genes. Hence, this study was designed to elucidate one possible mechanism underlying teicoplanin effects on cell proliferation using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay...
2016: Advanced Biomedical Research
Mohammadreza Movahedin, Teresa M Brooks, Nitin T Supekar, Naveen Gokanapudi, Geert-Jan Boons, Cory L Brooks
In cancer cells, the glycoprotein Mucin 1 (MUC1) undergoes abnormal, truncated glycosylation. The truncated glycosylation exposes cryptic peptide epitopes that can be recognized by antibodies. Since these immunogenic regions are cancer specific, they represent ideal targets for therapeutic antibodies. We investigated the role of tumor-specific glycosylation on antigen recognition by the therapeutic antibody AR20.5. We explored the affinity of AR20.5 to a synthetic cancer-specific MUC1 glycopeptide and peptide...
December 26, 2016: Glycobiology
Xudong Sun, Jing Dong, Jinan Li, Mingliang Ye, Weibing Zhang, Junjie Ou
A facile approach for preparation of hydrophilic polysaccharide-functionalized macroporous adsorption resin (MAR) was presented. Polydisperse MAR with approximately 250μm in diameter was synthesized via suspension polymerization and then modified with polysaccharides, sodium hyaluronate (HA) and chitosan (CS), through layer-by-layer (LbL) self-assembly process. The preparation method was facile, low cost and easy to expand production from tens of grams to one kilogram. The resulting MAR@(HA/CS)20 possesses highly hydrophilic property and rapid adsorption behavior...
December 16, 2016: Journal of Chromatography. A
Jingyao Bai, Zhongshan Liu, Hongwei Wang, Xin You, Junjie Ou, Yehua Shen, Mingliang Ye
A macroporous hydrophilic organic-silica hybrid monolithic column was synthesized via photoinitiated thiol-ene click polymerization reaction of 1-thioglycerol-modified polyhedral oligomeric vinylsilsesquioxane (vinylPOSS) and dithiothreitol (DTT) in a binary porogenic system consisting of tetrahydrofuran (THF) and dodecanol. 1-Thioglycerol was used to modify vinylPOSS in order to form a precursor with good solubility in the binary porogenic system. The influences of both the ratio of 1-thioglycerol/vinylPOSS and the porogenic solvents on the morphology and permeability of hybrid monoliths were studied in detail...
December 14, 2016: Journal of Chromatography. A
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