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https://www.readbyqxmd.com/read/28716758/oral-delivery-of-vancomycin-by-tetraether-lipid-liposomes
#1
Philipp Uhl, Silvia Pantze, Philip Storck, Johannes Parmentier, Dominik Witzigmann, Götz Hofhaus, Jörg Huwyler, Walter Mier, Gert Fricker
Despite the outstanding progress in modern medicine, the oral delivery of peptide drugs is limited until today due to their instability in the gastrointestinal tract and low mucosa penetration. To overcome these hurdles, liposomes containing the specific tetraether lipid GCTE (glycerylcaldityltetraether lipid) were examined. For this purpose, the glycopeptide antibiotic vancomycin was used as model substance and liposomes were prepared by DAC (dual assymetric centrifugation). These liposomes showed a size and polydispersity index comparable to standard liposomes...
July 14, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28715013/self-assembling-covalent-organic-framework-functionalized-magnetic-graphene-hydrophilic-biocomposites-as-an-ultrasensitive-matrix-for-n-linked-glycopeptide-recognition
#2
Jiaxi Wang, Jie Li, Mingxia Gao, Xiangmin Zhang
The development of additional functions and applications of covalent organic framework (COF)-derived materials still remains highly desired. In our work, a novel COF-functionalized magnetic graphene biocomposite (MagG@COF-5) was first developed as an ultrasensitive hydrophilic matrix via a facile self-assembly method for efficiently recognizing N-linked glycopeptides. By integrating the characteristics of the magnetic graphene and COF-5 layer, the MagG@COF-5 owns features of an outstanding magnetic response, a high specific area, strong hydrophilic properties and a unique size-exclusion effect...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28714397/prognostic-value-of-copeptin-in-chronic-kidney-disease-from-general-population-to-end-stage-renal-disease
#3
Edyta Golembiewska, Anna Machowska, Peter Stenvinkel, Bengt Lindholm
Arginine vasopressin (AVP), also known as antidiuretic hormone (ADH), is released in response to osmotic and non-osmotic stimuli and plays a key role in many physiologic and pathologic processes. The main function of AVP is the control of fluid homeostasis by inducing water conservation by the kidney, but it also stimulates arteriolar vasoconstriction and the release of adrenocorticotropic hormone (ACTH). These actions are mediated by different AVP receptors located on various target cells. Produced in hypothalamus from a larger precursor, pre-proAVP, AVP is produced in equimolar amounts to copeptin, a glycopeptide with yet unknown biologic function...
July 14, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28712551/facile-synthesis-of-thiol-polyethylene-glycol-functionalized-magnetic-titania-nanomaterials-for-highly-efficient-enrichment-of-n-linked-glycopeptides
#4
Jiawen Wang, Jizong Yao, Nianrong Sun, Chunhui Deng
As protein N-glycosylation involved in generation and development of various cancers and diseases, it is vital to capture glycopeptides from complex biological samples for biomarker discovery. In this work, by taking advantages of the interaction between titania and thiol groups, thiol-polyethylene glycol functionalized magnetic titania nanomaterials (denoted as Fe3O4@TiO2@PEG) were firstly fabricated as an excellent hydrophilic adsorbent of N-linked glycopeptides. On one hand, the special interaction of titanium-thiol makes the synthetic manipulation simple and provides a new idea for design and synthesis of novel nanomaterials; on the other hand, strong magnetic response could realize rapid separation and the outstanding hydrophilicity of polyethylene glycol makes Fe3O4@TiO2@PEG nanomaterials show superior performance for glycopeptides enrichment with ultralow limit of detection (0...
July 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28698020/first-outbreak-of-colonization-by-linezolid-and-glycopeptide-resistant-enterococcus-faecium-harbouring-the-cfr-gene-in-a-uk-nephrology-unit
#5
Teresa Inkster, John Coia, Danièle Meunier, Michel Doumith, Kate Martin, Rachel Pike, Laura Imrie, Hayley Kane, Marlene Hay, Camilla Wiuff, Julie Wilson, Chris Deighan, Katie L Hopkins, Neil Woodford, Robert Hill
AIM: To describe an outbreak of colonization by linezolid- and glycopeptide-resistant Enterococcus faecium harbouring the cfr gene, in a UK nephrology unit. METHODS: Isolates of linezolid-resistant E. faecium were typed by PFGE and examined by PCR and sequencing for the transmissible cfr gene that confers resistance to linezolid. Enhanced environmental cleaning, initial and weekly screening of all patients and monitoring of adherence to standard infection control precautions (SICPs) were implemented...
July 8, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28696669/in-vitro-reconstitution-of-oxya-enzymatic-activity-clarifies-late-steps-in-vancomycin-biosynthesis
#6
Clarissa C Forneris, Seyma Ozturk, Marcus I Gibson, Erik J Sorensen, Mohammad R Seyedsayamdost
Studies on the biosynthesis of glycopeptide antibiotics have provided many insights into the strategies that Nature employs to build architecturally strained molecules. A key structural feature of vancomycin, the founding member of this class, is a set of three aromatic crosslinks that are installed via yet unknown mechanisms. Previous reports have identified three cytochrome P450 enzymes involved in this process and demonstrated enzymatic activity for OxyB, which installs the first aromatic crosslink. However, the activities of the remaining two P450 enzymes have not been recapitulated...
July 11, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28695533/electron-transfer-higher-energy-collision-dissociation-ethcd-enabled-intact-glycopeptide-glycoproteome-characterization
#7
Qing Yu, Bowen Wang, Zhengwei Chen, Go Urabe, Matthew S Glover, Xudong Shi, Lian-Wang Guo, K Craig Kent, Lingjun Li
Protein glycosylation, one of the most heterogeneous post-translational modifications, can play a major role in cellular signal transduction and disease progression. Traditional mass spectrometry (MS)-based large-scale glycoprotein sequencing studies heavily rely on identifying enzymatically released glycans and their original peptide backbone separately, as there is no efficient fragmentation method to produce unbiased glycan and peptide product ions simultaneously in a single spectrum, and that can be conveniently applied to high throughput glycoproteome characterization, especially for N-glycopeptides, which can have much more branched glycan side chains than relatively less complex O-linked glycans...
July 10, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28692817/complications-of-hematopoietic-stem-transplantation-bacterial-infections
#8
REVIEW
Ali S Omrani, Reem S Almaghrabi
Bacterial infections remain a common complication of hematopoietic stem cell transplantation (HSCT), especially in the pre-engraftment phase. The risk of bacterial infections is mainly related to neutropenia, mucositis, and the presence of vascular lines. Most parts of the world have witnessed a shift in epidemiology toward Gram-negative bacteria; a large proportion of which are resistant to fluoroquinolones, extended-spectrum beta-lactams, carbapenems, and in some units even colistin. Meticulous infection control practices are essential for prevention of bacterial infections in HSCT...
July 3, 2017: Hematology/oncology and Stem Cell Therapy
https://www.readbyqxmd.com/read/28692416/immunoglobulin-g-n-glycans-as-potential-postgenomic-biomarkers-for-hypertension-in-the-kazakh-population
#9
Qing Gao, Mamatyusupu Dolikun, Jerko Štambuk, Hao Wang, Feifei Zhao, Nizam Yiliham, Youxin Wang, Irena Trbojević-Akmačić, Jie Zhang, Honghong Fang, Yang Sun, Hongli Peng, Zhongyao Zhao, Di Liu, Jiaonan Liu, Qihuan Li, Qi Sun, Lijuan Wu, Gordan Lauc, Wei Wang, Manshu Song
Next-generation (postgenomic) biomarkers from the nascent field of glycomics now offer fresh vistas for innovation in chronic disease biomarkers and system diagnostics in clinical medicine. Our previous work has shown an association between hypertension and immunoglobulin G (IgG) glycome composition, suggesting that individual variation in N-glycosylation of IgG might contribute to hypertension pathogenesis. The present study examined, for the first time to the best of our knowledge, the IgG N-glycans as potential biomarkers for hypertension in the Kazakh population...
July 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28691494/two-new-tools-for-glycopeptide-analysis-researchers-a-glycopeptide-decoy-generator-and-a-large-dataset-of-assigned-cid-spectra-of-glycopeptides
#10
Jude C Lakbub, Xiaomeng Su, Zhikai Zhu, Milani R W Patabandige, David Hua, Eden P Go, Heather Desaire
The glycopeptide analysis field is tightly constrained by a lack of effective tools that translate mass spectrometry data into meaningful chemical information, and perhaps the most challenging aspect ofbuilding effective glycopeptide analysis software is designing an accurate scoring algorithm for MS/MS data. Herein, we provide the glycoproteomics community with two tools to address this challenge. The first tool, a curated set of 100 expert-assigned CID spectra of glycopeptides, contains a diverse set of spectra from a variety of glycan types; the second tool, Glycopeptide Decoy Generator, is a new software application that generates glycopeptide decoys de novo...
July 10, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28691106/recombinant-myostatin-reduces-highly-expressed-micrornas-in-differentiating-c2c12-cells
#11
Zachary A Graham, Rita De Gasperi, William A Bauman, Christopher P Cardozo
Myostatin is small glycopeptide that is produced and secreted by skeletal muscle. It is a potent negative regulator of muscle growth that has been associated with conditions of frailty. In C2C12 cells, myostatin limits cell differentiation. Myostatin acts through activin receptor IIB, activin receptor-like kinase (ALK) and Smad transcription factors. microRNAs (miRNA) are short, 22 base pair nucleotides that bind to the 3' UTR of target mRNA to repress translation or reduce mRNA stability. In the present study, expression in differentiating C2C12 cells of the myomiRs miR-1 and 133a were down-regulated following treatment with 1 μg of recombinant myostatin at 1 d post-induction of differentiation while all myomiRs (miR-1, 133a/b and 206) were upregulated by SB431542, a potent ALK4/5/7 inhibitor which reduces Smad2 signaling, at 1 d and all, with the exception of miR-206, were upregulated by SB431542 at 3 d...
March 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28687742/zn-ii-mediates-vancomycin-polymerization-and-potentiates-its-antibiotic-activity-against-resistant-bacteria
#12
Ashraf Zarkan, Heather-Rose Macklyne, Dimitri Y Chirgadze, Andrew D Bond, Andrew R Hesketh, Hee-Jeon Hong
Vancomycin is known to bind to Zn(II) and can induce a zinc starvation response in bacteria. Here we identify a novel polymerization of vancomycin dimers by structural analysis of vancomycin-Zn(II) crystals and fibre X-ray diffraction. Bioassays indicate that this structure is associated with an increased antibiotic activity against bacterial strains possessing high level vancomycin resistance mediated by the reprogramming of peptidoglycan biosynthesis to use precursors terminating in D-Ala-D-Lac in place of D-Ala-D-Ala...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28685598/chromogranin-a-in-the-mammalian-heart-expression-without-secretion
#13
Lasse H Hansen, Stine Darkner, Jesper H Svendsen, Kristoffer Henningsen, Steen Pehrson, Xu Chen, Sergey Y Vakhrushev, Katrine T Schjoldager, Jens P Goetze
AIM: To investigate whether chromogranin A (CgA) is secreted from the heart into circulation. MATERIALS & METHODS: Porcine cardiac tissue was analyzed for the presence of CgA-derived glycopeptides using a global O-glycoproteomic strategy. Blood was sampled from the femoral vein, right atrium, coronary sinus and the left atrium from patients with predominantly atrial disease. The local concentration of proatrial natriuretic peptide and CgA was measured with immunoassays...
July 7, 2017: Biomarkers in Medicine
https://www.readbyqxmd.com/read/28681077/direct-analysis-of-site-specific-n-glycopeptides-of-serological-proteins-in-dried-blood-spot-samples
#14
Na Young Choi, Heeyoun Hwang, Eun Sun Ji, Gun Wook Park, Ju Yeon Lee, Hyun Kyoung Lee, Jin Young Kim, Jong Shin Yoo
Dried blood spot (DBS) samples have a number of advantages, especially with respect to ease of collection, transportation, and storage and to reduce biohazard risk. N-glycosylation is a major post-translational modification of proteins in human blood that is related to a variety of biological functions, including metastasis, cell-cell interactions, inflammation, and immunization. Here, we directly analyzed tryptic N-glycopeptides from glycoproteins in DBS samples using liquid chromatography-tandem mass spectrometry (LC-MS/MS) without centrifugation of blood samples, depletion of major proteins, desalting of tryptic peptides, and enrichment of N-glycopeptides...
July 6, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28681051/the-engases-versatile-biocatalysts-for-the-production-of-homogeneous-n-linked-glycopeptides-and-glycoproteins
#15
REVIEW
Antony J Fairbanks
The endo-β-N-acetylglucosaminidases (ENGases) are an enzyme class (EC 3.2.1.96) produced by a range of organisms, ranging from bacteria, through fungi, to higher order species, including humans, comprising two-sub families of glycosidases which all cleave the chitobiose core of N-linked glycans. Synthetic applications of these enzymes, i.e. to catalyse the reverse of their natural hydrolytic mode of action, allow the attachment of N-glycans to a wide variety of substrates which contain an N-acetylglucosamine (GlcNAc) residue to act as an 'acceptor' handle...
July 6, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28678517/substrate-preference-and-interplay-of-fucosyltransferase%C3%A2-8-and-n-acetylglucosaminyltransferases
#16
Tzu-Hao Tseng, Tzu-Wen Lin, Chien-Yu Chen, Chein-Hung Chen, Jung-Lee Lin, Tsui-Ling Hsu, Chi-Huey Wong
The core fucosylation of N-glycans on glycoproteins is catalyzed by fucosyltransferase 8 (FUT8) in mammalian cells and is involved in various biological functions, such as protein function, cancer progression, and postnatal development. The substrate specificity of FUT8 toward bi-antennary N-glycans has been reported, but it is unclear with regard to tri-antennary and tetra-antennary glycans. Here, we examined the specificity and activity of human FUT8 toward tri- and tetra-antennary N-glycans in the forms of glycopeptides...
July 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28676677/hla-e-presents-glycopeptides-from-the-mycobacterium-tuberculosis-protein-mpt32-to-human-cd8-t-cells
#17
Melanie J Harriff, Lisa M Wolfe, Gwendolyn Swarbrick, Megan Null, Meghan E Cansler, Elizabeth T Canfield, Todd Vogt, Katelynne Gardner Toren, Wei Li, Mary Jackson, Deborah A Lewinsohn, Karen M Dobos, David M Lewinsohn
Infection with Mycobacterium tuberculosis (Mtb), the bacterium that causes tuberculosis, remains a global health concern. Both classically and non-classically restricted cytotoxic CD8(+) T cells are important to the control of Mtb infection. We and others have demonstrated that the non-classical MHC I molecule HLA-E can present pathogen-derived peptides to CD8(+) T cells. In this manuscript, we identified the antigen recognized by an HLA-E-restricted CD8(+) T cell clone isolated from an Mtb latently infected individual as a peptide from the Mtb protein, MPT32...
July 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28676633/boronic-acid-modified-magnetic-fe3o4-mtio2-microspheres-for-highly-sensitive-and-selective-enrichment-of-n-glycopeptides-in-amniotic-fluid
#18
Zhonghua Shi, Liyong Pu, Yueshuai Guo, Ziyi Fu, Wene Zhao, Yunxia Zhu, Jindao Wu, Fuqiang Wang
Although mesoporous materials and magnetic materials are used to enrich glycopeptides, materials sharing both mesoporous structures and magnetic properties have not been reported for glycopeptide analyses. Here we prepared boronic acid-modified magnetic Fe3O4@mTiO2 microspheres by covalent binding of boronic acid molecules onto the surfaces of silanized Fe3O4@mTiO2 microspheres. The final particles (denoted as B-Fe3O4@mTiO2) showed a typical magnetic hysteresis curve, indicating superparamagnetic behavior; meanwhile, their mesoporous sizes did not change in spite of the reduction in surface area and pore volume...
July 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28676409/enterococci-in-orthopaedic-infections-who-is-at-risk-getting-infected
#19
Ilker Uçkay, Daniela Pires, Americo Agostinho, Nastassia Guanziroli, Mehmet Öztürk, Placido Bartolone, Philippe Tscholl, Michael Betz, Didier Pittet
Some orthopaedic patients might be at risk for enterococcal infections and might benefit from adapted perioperative prophylaxis. METHODS: We performed a single-center cohort of adult patients with orthopaedic infections. RESULTS: Among 2740 infection episodes, 665 surgeries (24%) involved osteosynthesis material, including total joint arthroplasties. The recommended perioperative prophylaxis was cefuroxime (or vancomycin in case of documented MRSA body carriage)...
July 1, 2017: Journal of Infection
https://www.readbyqxmd.com/read/28675699/immunization-with-a-synthetic-human-muc1-glycopeptide-vaccine-against-tumor-associated-muc1-breaks-tolerance-in-human-muc1-transgenic-mice
#20
Horst Kunz, Natascha Stergiou, Markus Glaffig, Helmut Jonuleit, Edgar Schmitt
Breaking the tolerance is crucial for an effective tumor immunotherapy. We showed that vaccines containing tumor-associated human MUC1 glycopeptides induce strong humoral anti-tumor responses in mice. The question remained whether such vaccines work in humans, in systems where huMUC1 is a self-antigen. To clarify the question, mice transgenic in expressing huMUC1, mimicking the self-tolerant environment, and wild-type mice were vaccinated with a synthetic vaccine. This vaccine comprised STn and Tn antigens bound to a MUC1 tandem repeat peptide coupled to Tetanus Toxoid...
July 4, 2017: ChemMedChem
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