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Glycopeptide

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https://www.readbyqxmd.com/read/28537384/cysteine-functionalized-metal-organic-framework-facile-synthesis-and-high-efficient-enrichment-of-n-linked-glycopeptides-in-cell-lysate
#1
Wen Ma, Linnan Xu, Xianjiang Li, Sensen Shen, Mei Wu, Yu Bai, Huwei Liu
Cysteine-functionalized metal-organic framework (MOF) was synthesized via a common and facile two-step method of in situ loading of Au nanoparticles on amino-derived MOF followed by L-Cysteine immobilization. Owing to the large specific surface area and ultrahigh hydrophilicity of this nanocomposite, excellent performance was observed in the enrichment of N-linked glycopeptides in both model glycoprotein and HeLa cell lysate. By using this nanocomposite, 16 and 31 glycopeptides were efficiently extracted from digest of horseradish peroxidase (HRP) and human serum immunoglobulin G (IgG), respectively...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534482/an-engineered-high-affinity-fbs1-carbohydrate-binding-protein-for-selective-capture-of-n-glycans-and-n-glycopeptides
#2
Minyong Chen, Xiaofeng Shi, Rebecca M Duke, Cristian I Ruse, Nan Dai, Christopher H Taron, James C Samuelson
A method for selective and comprehensive enrichment of N-linked glycopeptides was developed to facilitate detection of micro-heterogeneity of N-glycosylation. The method takes advantage of the inherent properties of Fbs1, which functions within the ubiquitin-mediated degradation system to recognize the common core pentasaccharide motif (Man3GlcNAc2) of N-linked glycoproteins. We show that Fbs1 is able to bind diverse types of N-linked glycomolecules; however, wild-type Fbs1 preferentially binds high-mannose-containing glycans...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28530388/microfluidic-capillary-electrophoresis-mass-spectrometry-for-analysis-of-monosaccharides-oligosaccharides-and-glycopeptides
#3
Kshitij Khatri, Joshua A Klein, John Haserick, Deborah R Leon, Catherine E Costello, Mark E McComb, Joseph Zaia
Glycomics and glycoproteomics analyses by mass spectrometry require efficient front-end separation methods to enable deep characterization of heterogeneous glycoform populations. Chromatography methods are generally limited in their ability to resolve glycoforms using mobile phases that are compatible with online liquid chromatography-mass spectrometry (LC-MS). The adoption of capillary electrophoresis-mass spectrometry methods (CE-MS) for glycomics and glycoproteomics is limited by the lack of convenient interfaces for coupling the CE devices to mass spectrometers...
May 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28527536/glycoproteomics-a-balance-between-high-throughput-and-in-depth-analysis
#4
REVIEW
Yang Yang, Vojtech Franc, Albert J R Heck
Glycoproteomics is an important subdiscipline of proteomics. Mass spectrometry (MS)-based glycoproteomics has relied so far on two levels of analysis, targeting either the released glycans or digested glycopeptides. However, limitations of these approaches, caused by the vast structural microheterogeneity that glycoproteins can exhibit, have become evident. Therefore, concomitant methods enabling deep characterization of all discrete glycoforms are essential to extend our functional understanding of the glycoproteome...
May 17, 2017: Trends in Biotechnology
https://www.readbyqxmd.com/read/28523604/chemo-enzymatic-synthesis-of-a-glycosylated-peptide-containing-a-complex-n-glycan-based-on-unprotected-oligosaccharides-by-using-dmt-mm-and-endo-m
#5
Yusuke Tomabechi, Toshihiko Katoh, Munetaka Kunishima, Toshiyuki Inazu, Kenji Yamamoto
For chemo-enzymatic synthesis of a glycosylated peptide, 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM) was used for the synthesis of a N-acetylglucosaminyl peptide and a pseudoglycopeptide by solid-phase peptide synthesis without the requirement of protecting groups on the carbohydrate. We also performed transglycosylation of an N-glycan to the N-acetylglucosaminyl peptide using endo-β-N-acetylglucosaminidase from Mucor hiemalis (Endo-M) to synthesize a glycopeptide containing a complex N-glycan...
May 18, 2017: Glycoconjugate Journal
https://www.readbyqxmd.com/read/28518125/glycoproteomics-of-the-extracellular-matrix-a-method-for-intact-glycopeptide-analysis-using-mass-spectrometry
#6
Javier Barallobre-Barreiro, Ferheen Baig, Marika Fava, Xiaoke Yin, Manuel Mayr
Fibrosis is a hallmark of many cardiovascular diseases and is associated with the exacerbated secretion and deposition of the extracellular matrix (ECM). Using proteomics, we have previously identified more than 150 ECM and ECM-associated proteins in cardiovascular tissues. Notably, many ECM proteins are glycosylated. This post-translational modification affects protein folding, solubility, binding, and degradation. We have developed a sequential extraction and enrichment method for ECM proteins that is compatible with the subsequent liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis of intact glycopeptides...
April 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28515059/antibiotic-stability-over-six-weeks-in-aqueous-solution-at-body-temperature-with-and-without-heat-treatment-that-mimics-the-curing-of-bone-cement
#7
E Samara, T F Moriarty, L A Decosterd, R G Richards, E Gautier, P Wahl
OBJECTIVES: Thermal stability is a key property in determining the suitability of an antibiotic agent for local application in the treatment of orthopaedic infections. Despite the fact that long-term therapy is a stated goal of novel local delivery carriers, data describing thermal stability over a long period are scarce, and studies that avoid interference from specific carrier materials are absent from the orthopaedic literature. METHODS: In this study, a total of 38 frequently used antibiotic agents were maintained at 37°C in saline solution, and degradation and antibacterial activity assessed over six weeks...
May 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28514853/targeting-the-central-nervous-system-cns-a-review-of-rabies-virus-targeting-strategies
#8
Mira Oswald, Simon Geissler, Achim Goepferich
The transport of drugs across the blood-brain barrier is challenging. The use of peptide sequences derived from viruses with a central nervous system (CNS) tropism is one elegant option. A prominent example is the rabies virus glycopeptide-29 (RVG-29), which is said to enable a targeted brain delivery. Although the entry mechanism of the rabies virus into the CNS is very well characterized, it is unknown whether RVG-29-functionalized drug delivery systems (DDSs) follow this pathway. RVG-29-functionalized DDSs present themselves with modifications of the RVG-29 peptide sequence and different physicochemical properties compared to the rabies virus...
May 17, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28514044/specific-identification-of-glycoproteins-bearing-the-tn-antigen-in-human-cells
#9
Jiangnan Zheng, Haopeng Xiao, Ronghu Wu
Glycoproteins contain a wealth of valuable information regarding the development and disease status of cells. In cancer cells, some glycans (such as the Tn antigen) are highly up-regulated, but this remains largely unknown for glycoproteins with a particular glycan. Herein, an innovative method combining enzymatic and chemical reactions was first designed to enrich glycoproteins with the Tn antigen. Using synthetic glycopeptides with O-GalNAc (the Tn antigen) or O-GlcNAc, we demonstrated that the method is selective for glycopeptides with O-GalNAc and can distinguish between these two modifications...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28513898/synthesis-of-bodipy-labelled-cholesterylated-glycopeptides-by-tandem-click-chemistry-for-glycocalyxification-of-giant-unilamellar-vesicles-guvs
#10
Nicolai Stuhr-Hansen, Charikleia-Despoina Vagianou, Ola Blixt
The glycocalyx cover membrane surfaces of all living cells. These complex archtechtures render their interaction mechanisms on the membrane surface difficult to study. Artificial cell-sized membranes with selected and defined glycosylation patterns may serve as a minimalistic approach to systematically study cell surface glycan interactions. Here we developed a facile general synthetic procedure for the synthesis of BODIPY-labelled cholesterylated glycopeptides, which can coat cell-size giant unilamellar vesicles (GUVs)...
May 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28511809/characterisation-of-the-selective-binding-of-antibiotics-vancomycin-and-teicoplanin-by-the-vans-receptor-regulating-type-a-vancomycin-resistance-in-the-enterococci
#11
C S Hughes, E Longo, M K Phillips-Jones, R Hussain
A-type resistance towards "last-line" glycopeptide antibiotic vancomycin in the leading hospital acquired infectious agent, the enterococci, is the most common in the UK. Resistance is regulated by the VanRASA two-component system, comprising the histidine sensor kinase VanSA and the partner response regulator VanRA. The nature of the activating ligand for VanSA has not been identified, therefore this work sought to identify and characterise ligand(s) for VanSA. In vitro approaches were used to screen the structural and activity effects of a range of potential ligands with purified VanSA protein...
May 13, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28510654/asn-linked-oligosaccharide-chain-of-a-crenarchaeon-pyrobaculum-calidifontis-is-reminiscent-of-the-eukaryotic-high-mannose-type-glycan
#12
Daisuke Fujinami, Yuya Taguchi, Daisuke Kohda
Pyrobaculum calidifontis is a hyperthermophilic archaeon that belongs to the phylum Crenarchaeota. In contrast to the phylum Euryarchaeota, only the N-glycan structure of the genus Sulfolobus is known in Crenarchaeota. Here, we enriched glycoproteins from cultured P. calidifontis cells, by ConA lectin chromatography. The MASCOT search identified proteins with at least one potential N-glycosylation site. The MS/MS analysis of twelve small tryptic glycopeptides confirmed the canonical N-glycosylation consensus in P...
May 16, 2017: Glycobiology
https://www.readbyqxmd.com/read/28508363/glycoproteins-enrichment-and-lc-ms-ms-glycoproteomics-in-central-nervous-system-applications
#13
Rui Zhu, Ehwang Song, Ahmed Hussein, Firas H Kobeissy, Yehia Mechref
Proteins and glycoproteins play important biological roles in central nervous systems (CNS). Qualitative and quantitative evaluation of proteins and glycoproteins expression in CNS is critical to reveal the inherent biomolecular mechanism of CNS diseases. This chapter describes proteomic and glycoproteomic approaches based on liquid chromatography/tandem mass spectrometry (LC-MS or LC-MS/MS) for the qualitative and quantitative assessment of proteins and glycoproteins expressed in CNS. Proteins and glycoproteins, extracted by a mass spectrometry friendly surfactant from CNS samples, were subjected to enzymatic (tryptic) digestion and three down-stream analyses: (1) a nano LC system coupled with a high-resolution MS instrument to achieve qualitative proteomic profile, (2) a nano LC system combined with a triple quadrupole MS to quantify identified proteins, and (3) glycoprotein enrichment prior to LC-MS/MS analysis...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28507244/inhibition-of-staphylococcus-aureus-cell-wall-biosynthesis-by-desleucyl-oritavancin-a-quantitative-peptidoglycan-composition-analysis-by-mass-spectrometry
#14
James D Chang, Erin E Foster, Aanchal N Thadani, Alejandro J Ramirez, Sung Joon Kim
Oritavancin is a lipoglycopeptide antibiotic that exhibits potent activities against vancomycin-resistant Gram-positive pathogens. Oritavancin differs from vancomycin by a hydrophobic side chain attached to the drug disaccharide, which forms a secondary-binding site to enable oritavancin binding to the cross-linked peptidoglycan in cell wall. The mode of action of secondary-binding site was investigated by measuring the changes in the peptidoglycan composition of Staphylococcus aureus grown in presence of desleucyl-oritavancin at sub-inhibitory concentration using liquid chromatography-mass spectrometry (LC-MS)...
May 15, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28505427/modification-of-sialic-acids-on-solid-phase-accurate-characterization-of-protein-sialylation
#15
Shuang Yang, Lei Zhang, Stefani N Thomas, Yingwei Hu, Shuwei Li, John F Cipollo, Hui Zhang
Sialic acids play many important roles in several physiological and pathological processes, including cancers, infection and blood diseases. Sialic acids are fragile and prone to fragmentation under electrospray ionization and matrix-assisted laser desorption/ionization. It is crucial to modify sialic acids for qualitative and quantitative identification of their change in abundance in complex biological samples. Permethylation is a method of choice for sialic acid stabilization, but the harsh conditions during permethylation may lead to the decomposition of O-acetyl groups...
May 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28497834/the-effect-of-carbohydrate-structures-on-the-hydrogelation-ability-and-morphology-of-self-assembled-structures-of-peptide-carbohydrate-conjugates-in-water
#16
Tomoya Tsuzuki, Marina Kabumoto, Hanae Arakawa, Masato Ikeda
We describe the construction of peptide-carbohydrate conjugates, namely glycopeptides, capable of self-assembling in water. We found that disaccharide structures (epimer or glycosidic-bond geometry) appended to the glycopeptides have a noticeable effect on the hydrogel formation ability as well as the morphology of the self-assembled structures. The soft materials consisting of self-assembled structures with carbohydrates on their surface and various types of morphologies might be useful as matrices to investigate the function of carbohydrates in biological events...
May 12, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28494608/parenteral-nutrition-in-childhood-and-consequences-for-dentition-and-gingivae
#17
D Olczak-Kowalczyk, M Danko, E Banaś, D Gozdowski, K Popińska, E Krasuska-Sławińska, J Książyk
AIM: Assessment of dentition in children under parenteral nutrition, risk factors for caries, and dental developmental abnormalities. MATERIALS AND METHODS: The study involved 63 patients (aged 2.25-16.6 years), i.e. 32 subjects receiving parenteral nutrition for a mean period of 5.6±2.94 years, and 31 healthy control subjects. Oral hygiene (OHI-S, PL-I), gingival (GI), and dentition status (caries, DMFT/dmft, enamel defects, shape alterations), frequency of oral meals and frequency of cariogenic snacks consumption were evaluated...
March 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28494147/structural-insight-into-the-stabilizing-effect-of-o-glycosylation
#18
Patrick K Chaffey, Xiaoyang Guan, Chao Chen, Yuan Ruan, Xingfeng Wang, Amy H Tran, Theo N Koelsch, Qiu Cui, Yingang Feng, Zhongping Tan
Protein glycosylation has been shown to have a variety of site-specific and glycan-specific effects, but so far the molecular logic that leads to such observations has been elusive. Understanding the structural changes that occur and being able to correlate those with the physical properties of the glycopeptide is a valuable step towards being able to predict how specific glycosylation patterns will affect the stability of glycoproteins. By systematically comparing the structural features of the O-glycosylated carbohydrate-binding module of a Trichoderma reesei-derived Family 7 cellobiohydrolase, we were able to develop a better understanding of the influence of O-glycan structure on the molecule's physical stability...
May 11, 2017: Biochemistry
https://www.readbyqxmd.com/read/28489544/an-improved-approach-for-n-linked-glycan-structure-identification-from-hcd-ms-ms-spectra
#19
Weiping Sun, Yi Liu, Gilles Lajoie, Bin Ma, Kaizhong Zhang
Glycosylation is a frequently observed posttranslational modification on proteins. Currently, tandem mass spectrometry (MS/MS) serves as an efficient analytical technique for characterizing structures of oligosaccharides. However, developing effective computational approaches for identifying glycan structures from mass spectra is still a great challenge in glycoproteomics research. In this study, we proposed an approach for matching the input spectra with glycan structures acquired from a glycan structure database by incorporating a de novo sequencing assisted ranking scheme...
May 5, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28485359/spectrum-of-bacteremia-in-posthematopoietic-stem-cell-transplant-patients-from-an-indian-center
#20
A Ghafur, V Devarajan, R Raj, J Easow, T Raja
BACKGROUND: Despite the relatively low prevalence of Gram-positive bacteremic infections in Indian oncology patients, glycopeptides are extensively used for empirical management of febrile neutropenia. Our aim was to analyze the spectrum of bacteremia in posthematopoietic stem cell transplant (HSCT) recipients in our center and make a recommendation on glycopeptide use in this patient population. MATERIALS AND METHODS: Retrospective analysis of bacteremic data from HSCT recipients in a tertiary care oncology and transplant center from South India, between 2011 and 2013...
October 2016: Indian Journal of Cancer
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