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https://www.readbyqxmd.com/read/29792669/self-assembling-glutamate-functionalized-cyclodextrin-molecular-tube-for-specific-enrichment-of-n-linked-glycopeptides
#1
Haijiao Zheng, Xiqian Li, Qiong Jia
Cyclodextrin molecular tube (CDMT), a new comer of cyclodextrin family, possesses large and hydrophilic outer area and stable structure. Its development and applications remain highly desired, especially in the field of separation and enrichment. Herein, we developed a CDMT-based enrichment platform focusing on the specific capture of glycopeptides. To enhance the hydrophilicity of CDMT, it was functionalized with glutamate (glu). The prepared gluCDMT exhibited large hydrophilic surface, high stability, and good acidic/alkalic resistance...
May 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29784830/structural-basis-of-o-glcnac-recognition-by-mammalian-14-3-3-proteins
#2
Clifford A Toleman, Maria A Schumacher, Seok-Ho Yu, Wenjie Zeng, Nathan J Cox, Timothy J Smith, Erik J Soderblom, Amberlyn M Wands, Jennifer J Kohler, Michael Boyce
O-GlcNAc is an intracellular posttranslational modification that governs myriad cell biological processes and is dysregulated in human diseases. Despite this broad pathophysiological significance, the biochemical effects of most O-GlcNAcylation events remain uncharacterized. One prevalent hypothesis is that O-GlcNAc moieties may be recognized by "reader" proteins to effect downstream signaling. However, no general O-GlcNAc readers have been identified, leaving a considerable gap in the field. To elucidate O-GlcNAc signaling mechanisms, we devised a biochemical screen for candidate O-GlcNAc reader proteins...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29784395/development-a-hydrazide-functionalized-thermosensitive-polymer-based-homogeneous-system-for-highly-efficient-n-glycoprotein-glycopeptide-enrichment-from-human-plasma-exosome
#3
Haihong Bai, Yiting Pan, Lu Qi, Long Liu, Xinyuan Zhao, Hangyan Dong, Xiaoqiang Cheng, Weijie Qin, Xinghe Wang
As one of the most common post-translational modifications, protein N-glycosylation precipitates in many important biological processes and has closely correlations with the occurrence and progression of multiple diseases. Plasma exosomes secreted by cells contain various bioactive N-glycoproteins which may serve as potential biomarkers for early disease diagnosis and treatment. However, the protein N-glycosylation profile in human plasma exosome is largely unknown, due to the technical challenges in glycoprotein identification...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29782794/peptides-peptidomimetics-and-carbohydrate-peptide-conjugates-as-amyloidogenic-aggregation-inhibitors-for-alzheimer-s-disease
#4
Philip Ryan, Bhautikkumar Patel, Vivek Makwana, Hemant Jadhav, Milton John Kiefel, Andrew Davey, Tristan Reekie, Santosh Rudrawar, Michael Kassiou
Alzheimer's disease (AD) is a progressive neurodegenerative disorder accounting for 60-80% of dementia cases. For many years, AD causality was attributed to amyloid-β (Aβ) aggregated species. Recently, multiple therapies that target Aβ aggregation have failed in clinical trials, since Aβ aggregation is found in AD and healthy patients. Attention has therefore shifted towards the aggregation of the peptide tau as a major driver of AD. Numerous inhibitors of tau-based pathology have recently been developed...
May 21, 2018: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/29782143/anti-tumor-humoral-and-t-cell-responses-by-mucin-1-conjugates-of-bacteriophage-qb-in-wildtype-mice
#5
Zhaojun Yin, Xuanjun Wu, Katarzyna Kaczanowska, Suttipun Sungsuwan, Marta Comellas-Aragones, Christian Pett, Jin Yu, Claire Baniel, Ulrika Westerlind, M G Finn, Xuefei Huang
Mucin-1 (MUC1) is one of the top ranked tumor associated antigens. In order to generate effective anti-MUC1 immune responses as potential anti-cancer vaccines, MUC1 peptides and glycopeptides have been covalently conjugated to bacteriophage Qb. Immunization of mice with these constructs led to highly potent antibody responses with IgG titers over one million, which are among the highest anti-MUC1 IgG titers reported to date. Furthermore, the high IgG antibody levels persisted for more than six months. The constructs also elicited MUC1 specific cytotoxic T cells, which can selectively kill MUC1 positive tumor cells...
May 21, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/29781425/clinical-predictors-of-methicillin-resistance-and-their-impact-on-mortality-associated-with-staphylococcus-aureus-bacteraemia
#6
Y M Wi, J Y Rhee, C I Kang, D R Chung, J H Song, K R Peck
We investigated the clinical predictors of methicillin-resistance and their impact on mortality in 371 patients with Staphylococcus aureus bacteraemia identified from two prospective multi-centre studies. Methicillin resistant S. aureus (MRSA) accounted for 42.2% of community-onset and 74.5% of hospital-onset cases. No significant clinical difference was found between patients infected with MRSA vs. methicillin-sensitive S. aureus (MSSA), except that the former were more likely to have had hospital-onset bacteraemia and received antibiotics in the preceding 90 days...
May 21, 2018: Epidemiology and Infection
https://www.readbyqxmd.com/read/29776550/hydrophilic-probe-in-mesoporous-pore-for-selective-enrichment-of-endogenous-glycopeptides-in-biological-samples
#7
Yilin Li, Chunhui Deng, Nianrong Sun
As one of the most important post-translational modifications (PTMs) of peptidome, glycopeptidome is closely related to serious disease, especially to cancer. In order to specifically discover and analyze glycopeptidome biomarkers for clinical diagnosis of cancer on early-stage, it is crucial to develop efficient technique to analyze low-abundance of endogenous glycopeptides in biological samples. In this report, a hydrophilic probe in mesoporous pore (denoted as Fe3 O4 @mSiO2 @G6P) was designed and prepared...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29775787/genomic-insights-of-reduced-teicoplanin-susceptible-community-acquired-methicillin-resistant-staphylococcus-aureus-mrsa-case-of-necrotizing-fasciitis
#8
Yamuna Devi Bakthavatchalam, Boopalan Ramaswamy, Rajinikanth Janakiraman, Runal John Steve, Balaji Veeraraghavan
OBJECTIVE: Glycopeptides are being increasingly used to multi-resistant MRSA infections. We report MRSA with low level teicoplanin resistance recovered from a patient treated with teicoplanin for fatal necrotizing fasciitis. PATIENT AND METHODS: MRSA recovered from a patient with necrotizing fasciitis was treated with teicoplanin. The minimum inhibitory concentration (MIC) for vancomycin and teicoplanin was determined using E-test. Reduced glycopeptide susceptibility was screened using GRD E-test and population analysis profile (PAP) method...
May 15, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29775240/analysis-of-pngase-f-resistant-n-glycopeptides-using-sugarqb-for-proteome-discoverer-2-1-reveals-cryptic-substrate-specificities
#9
Johannes Stadlmann, David M Hoi, Jasmin Taubenschmid, Karl Mechtler, Josef M Penninger
SugarQb (www.imba.oeaw.ac.at/sugarqb) is a freely available collection of computational tools for the automated identification of intact glycopeptides from high-resolution HCD MS/MS data-sets in the Proteome Discoverer environment. We report the migration of SugarQb to the latest and free version of Proteome Discoverer 2.1, and apply it to the analysis of PNGase F-resistant N-glycopeptides from mouse embryonic stem cells. The analysis of intact glycopeptides highlights unexpected technical limitations to PNGase F-dependent glycoproteomic workflows at the proteome level, and warrants a critical re-interpretation of seminal data-sets in the context of N-glycosylation-site prediction...
May 18, 2018: Proteomics
https://www.readbyqxmd.com/read/29773059/biomedical-applications-of-glycoconjugates
#10
Fei Ding, Yongmin Zhang
Glycans expressed on the forefront surface of cells participate in many key biological processes via forming various glycoconjugates. The recognition of complex glycoconjugates as mediators of important biological processes has stimulated investigation into their therapeutic potential. As the increasing accessibility of glycoconjugates, it has been widely applied in the field of drug delivery. This review particularly refers to the constitutive glycoconjugates of receptor-mediated binding of glycoprotein, glycolipids and glycopeptides for cell-selective drug delivery, in order to broaden the future therapeutic scope of drug delivery system and effective cancer therapy...
May 17, 2018: Mini Reviews in Medicinal Chemistry
https://www.readbyqxmd.com/read/29752626/acute-kidney-injury-associated-with-concomitant-vancomycin-and-piperacillin-tazobactam-administration-a-systematic-review-and-meta-analysis
#11
REVIEW
Xiao-Yu Chen, Ri-Xiang Xu, Xin Zhou, Yang Liu, Cheng-Yang Hu, Xue-Feng Xie
BACKGROUND: As a tricyclic glycopeptide antibiotic used to treat acute infections, Vancomycin (VAN) is often administered with piperacillin/tazobactam (PT) to treat various infections in clinical practice. However, whether the combination of these two drugs, compared to VAN alone, can cause an increased risk of acute kidney injury (AKI) remains controversial. OBJECTIVES: This study aims to identify the correlation between the development of AKI and the combined use of VAN and PT...
May 11, 2018: International Urology and Nephrology
https://www.readbyqxmd.com/read/29751197/investigating-cytochrome-p450-specificity-during-glycopeptide-antibiotic-biosynthesis-through-a-homologue-hybridization-approach
#12
Clara Brieke, Miroslaw Tarnawski, Anja Greule, Max J Cryle
Cytochrome P450 enzymes perform an impressive range of oxidation reactions against diverse substrate scaffolds whilst generally maintaining a conserved tertiary structure and active site chemistry. Within secondary metabolism, P450 enzymes play widespread and important roles in performing crucial modifications of precursor molecules, with one example of the importance of such reactions being found in the biosynthesis of the glycopeptide antibiotics (GPAs). In GPA biosynthesis P450s, known as Oxy enzymes, are key players in the cyclization of the linear GPA peptide precursor, which is a process that is both essential for their antibiotic activity and is the source of the synthetic challenge of these important antibiotics...
May 3, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29751008/impact-of-glycosylation-on-the-local-backbone-flexibility-of-well-defined-igg1-fc-glycoforms-using-hydrogen-exchange-mass-spectrometry-hx-ms
#13
Apurva S More, Ronald T Toth, Solomon Z Okbazghi, C Russell Middaugh, Sangeeta B Joshi, Thomas J Tolbert, David B Volkin, David D Weis
We have utilized hydrogen exchange-mass spectrometry (HX-MS) to characterize local backbone flexibility of four well-defined IgG1-Fc glycoforms expressed and purified from Pichia pastoris, two of which were prepared using subsequent in vitro enzymatic treatments. Progressively decreasing the size of the N-linked N297 oligosaccharide from high mannose (Man8-Man12), to Man5, to GlcNAc, to non-glycosylated N297Q resulted in progressive increases in backbone flexibility. Comparison of these results with recently published physicochemical stability and Fcγ receptor binding data with the same set of glycoproteins provide improved insights into correlations between glycan structure and these pharmaceutical properties...
May 8, 2018: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29746714/evaluation-of-the-effectiveness-of-dose-individualization-to-achieve-therapeutic-vancomycin-concentrations
#14
Ahmed A Abulfathi, Maxwell Chirehwa, Bernd Rosenkranz, Eric H Decloedt
The glycopeptide antibiotic vancomycin is used for treatment of methicillin-resistant Gram-positive cocci. Adequate vancomycin plasma concentrations are related to bacterial cure. However, inter- and intrapatient variability make it difficult to achieve therapeutic vancomycin concentrations. The primary objective of this study was to determine the effectiveness of using computerized therapeutic drug monitoring (TDM) to assist in achieving therapeutic vancomycin concentrations at a tertiary hospital in South Africa...
May 10, 2018: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29746433/measurement-of-teicoplanin-concentration-with-liquid-chromatography-tandem-mass-spectrometry-method-demonstrates-the-usefulness-of-therapeutic-drug-monitoring-in-hematologic-patient-populations
#15
Hyojin Chae, Jeong Joong Lee, Kyoungho Cha, Su Hyun Her, Hyo-Young Kim, Eunhee Han, Myungshin Kim, Yonggoo Kim, Sung-Yeon Cho, Dong-Gun Lee
BACKGROUND: Teicoplanin is a glycopeptide antibiotic that has become increasingly popular with the spread of methicillin-resistant Staphylococcus aureus. The aim of the study was to develop and validate an ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method for teicoplanin, and analyze trough teicoplanin concentrations achieved in patients with hematological diseases. METHODS: The UHPLC-MS/MS method for teicoplanin was developed, validated, and applied in a retrospective analysis of trough plasma teicoplanin concentrations from 305 patients receiving standard dose, and 17 patients receiving therapeutic drug monitoring (TDM)-guided individualized dose...
June 2018: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29745792/neonates-are-not-just-little-children-and-need-more-finesse-in-dosing-of-antibiotics
#16
Karel Allegaert, John van den Anker
OBJECTIVES: Neonates are not just little children. They need more finesse in decisions on when to treat, which antibiotics to use and how to dose these antibiotics. METHODS: Representative compounds of three major classes of antibiotics (beta-lactams, aminoglycosides, glycopeptides) are discussed in a narrative review to illustrate the recent progress in the knowledge on PK and its covariates (how to dose). RESULTS: This knowledge can subsequently be converted to targeted exposure dosing regimens...
May 10, 2018: Acta Clinica Belgica
https://www.readbyqxmd.com/read/29744794/evaluation-of-risk-factors-for-vancomycin-induced-nephrotoxicity
#17
So Jin Park, Na Ri Lim, Hyo Jung Park, Jae Wook Yang, Min-Ji Kim, Kyunga Kim, Yong Won In, Young Mee Lee
Background Vancomycin is a glycopeptide antibiotic of choice for the treatment of serious infections caused by multi-resistant Gram-positive bacteria. However, vancomycin-associated nephrotoxicity (VAN) often limits its use. Previous data suggested a few risk factors of VAN, including higher mean vancomycin trough level, higher daily doses, old age, long duration of vancomycin therapy, and concomitant nephrotoxins. Objective To evaluate the incidence and risk factors of VAN and determine whether higher vancomycin trough concentrations were associated with a greater risk for VAN...
May 9, 2018: International Journal of Clinical Pharmacy
https://www.readbyqxmd.com/read/29742898/2d-mos2-based-zwitterionic-zic-hilic-material-for-the-specific-enrichment-of-glycopeptides
#18
Chaoshuang Xia, Fenglong Jiao, Fangyuan Gao, Heping Wang, Yayao Lv, Yehua Shen, Yangjun Zhang, Xiaohong Qian
Mass spectrometry (MS)-based glycoproteomics research requires highly efficient sample preparation to eliminate interference from non-glycopeptides and to improve the efficiency of glycopeptide detection. In this work, a novel MoS2-Au-NP-L-cysteine nanocomposite was prepared for glycopeptide enrichment. The two-dimensional (2D) structured MoS2 nanosheets served as a matrix that could provide a large surface area for immobilizing hydrophilic groups (such as L-cysteine) with low steric hindrance between the materials and the glycopeptides...
May 9, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29742324/effective-assignment-of-%C3%AE-2-3-%C3%AE-2-6-sialic-acid-isomers-in-lc-ms-ms-based-glycoproteomics
#19
Christian Pett, Waqas Nasir, Carina Sihlbom, Britt-Marie Olsson, Vanessa Caixeta, Manuel Schorlemer, Rene P Zahedi, Göran Larsson, Jonas Nilsson, Ulrika Westerlind
Distinct structural changes of the α2,3/α2,6 sialic acid glycosidic linkages on glycoproteins are of importance in cancer biology, inflammatory diseases and virus tropism. Current glycoproteomic methodologies are, however, not amenable toward high-throughput characterization of sialic acid isomers. To enable such assignments, we developed a mass spectrometry method utilizing synthetic model glycopeptides for the analysis of oxonium ion intensity ratios. This method was successfully applied in large-scale glycoproteomics, allowing site-specific structural characterization of sialic acid isomers...
May 9, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29742223/acute-kidney-injury-and-intra-abdominal-hypertension-in-burn-patients-in-intensive-care
#20
Thalita Bento Talizin, Meiry Sayuri Tsuda, Marcos Toshiyuki Tanita, Ivanil Aparecida Moro Kauss, Josiane Festti, Cláudia Maria Dantas de Maio Carrilho, Cintia Magalhães Carvalho Grion, Lucienne Tibery Queiroz Cardoso
OBJECTIVE: To evaluate the frequency of intra-abdominal hypertension in major burn patients and its association with the occurrence of acute kidney injury. METHODS: This was a prospective cohort study of a population of burn patients hospitalized in a specialized intensive care unit. A convenience sample was taken of adult patients hospitalized in the period from 1 August 2015 to 31 October 2016. Clinical and burn data were collected, and serial intra-abdominal pressure measurements taken...
March 2018: Revista Brasileira de Terapia Intensiva
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