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https://www.readbyqxmd.com/read/28230157/highly-sensitive-and-adaptable-fluorescence-quenched-pair-discloses-the-substrate-specificity-profiles-in-diverse-protease-families
#1
Marcin Poreba, Aleksandra Szalek, Wioletta Rut, Paulina Kasperkiewicz, Izabela Rutkowska-Wlodarczyk, Scott J Snipas, Yoshifumi Itoh, Dusan Turk, Boris Turk, Christopher M Overall, Leszek Kaczmarek, Guy S Salvesen, Marcin Drag
Internally quenched fluorescent (IQF) peptide substrates originating from FRET (Förster Resonance Energy Transfer) are powerful tool for examining the activity and specificity of proteases, and a variety of donor/acceptor pairs are extensively used to design individual substrates and combinatorial libraries. We developed a highly sensitive and adaptable donor/acceptor pair that can be used to investigate the substrate specificity of cysteine proteases, serine proteases and metalloproteinases. This novel pair comprises 7-amino-4-carbamoylmethylcoumarin (ACC) as the fluorophore and 2,4-dinitrophenyl-lysine (Lys(DNP)) as the quencher...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224981/unusual-anti-allergic-diterpenoids-from-the-marine-sponge-hippospongia-lachne
#2
Li-Li Hong, Hao-Bing Yu, Jie Wang, Wei-Hua Jiao, Bao-Hui Cheng, Fan Yang, Yong-Jun Zhou, Bin-Bin Gu, Shao-Jiang Song, Hou-Wen Lin
Hipposponlachnins A (1) and B (2), possessing an unprecedented tetracyclo [9.3.0.0(2,8).0(3,7)] tetradecane ring system, and the probable biogenetic precursor [3, (1R*,2E,4R*,7E,10S*,11S*,12R*)-10, 18-diacetoxydolabella-2,7-dien-6-one] of 1‒2 were isolated from the South China Sea marine sponge Hippospongia lachne. The structures of the novel compounds were determined using integrated spectroscopic methods in combination with single-crystal X-ray diffraction analysis. Compounds 1‒2 showed potent inhibitory activity on the release of β-hexosaminidase, a biomarker for degranulation, as well as the production of pro-inflammatory cytokine IL-4 and lipid mediator LTB4 in DNP-IgE-stimulated RBL-2H3 cells...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28216902/feeble-antipyretic-analgesic-and-anti-inflammatory-activities-were-found-with-regular-dose-4-o-%C3%AE-d-glucosyl-5-o-methylvisamminol-one-of-the-conventional-marker-compounds-for-quality-evaluation-of-radix-saposhnikoviae
#3
Jing-Ming Yang, Hua Jiang, Hong-Liang Dai, Zi-Wei Wang, Gui-Zhi Jia, Xiang-Cai Meng
INTRODUCTION: 4'-O-β-D-glucosyl-5-O-methylvisamminol (GML) is a conventional marker compound for quality control of Radix Saposhnikoviae. Despite that, neither pharmacodynamic or pharmacokinetic information is available with regard to GML. As such, the aim of thisstudy was to assess the conventional evaluation indices for the quality of Radix Saposhnikoviae. MATERIALS AND METHODS: Pyretic animal model, hot plate test, and ear edema model were established to evaluate and compare the antipyretic, analgesic, and anti-inflammatory effect of the chromone derivativescimifugin, prime-O-glucosylcimifugin (PGCN), and GML in Radix Saposhnikoviae...
January 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28213899/human-influence-and-biotic-homogenization-drive-the-distribution-of-escherichia-coli-virulence-genes-in-natural-habitats
#4
Adriana Cabal, Joaquin Vicente, Julio Alvarez, Jose Angel Barasona, Mariana Boadella, Lucas Dominguez, Christian Gortazar
Cattle are the main reservoirs for Shiga-toxin-producing Escherichia coli (STEC), the only known zoonotic intestinal E. coli pathotype. However, there are other intestinal pathotypes that can cause disease in humans, whose presence has been seldom investigated. Thus, our aim was to identify the effects of anthropic pressure and of wild and domestic ungulate abundance on the distribution and diversity of the main human E. coli pathotypes and nine of their representative virulence genes (VGs). We used a quantitative real-time PCR (qPCR) for the direct detection and quantification of the genus-specific gene uidA, nine E...
February 18, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28195488/surface-sensitive-nmr-detection-of-the-sei-layer-on-reduced-graphene-oxide
#5
Michal Leskes, Gunwoo Kim, Tao Liu, Alison L Michan, Fabien Aussenac, Patrick Dorffer, Subhradip Paul, Clare P Grey
The solid electrolyte interphase (SEI) is detrimental for rechargeable batteries' performance and lifetime. Understanding its formation requires analytical techniques that provide molecular level insight. Here dynamic nuclear polarization (DNP) is utilized for the first time for enhancing the sensitivity of solid state NMR (ssNMR) spectroscopy to the SEI. The approach is demonstrated on reduced-graphene oxide (rGO) cycled in Li-ion cells in natural abundance and 13C-enriched electrolyte solvents. Our results indicate that DNP enhances the signal of outer SEI layers, enabling detection of natural abundance 13C spectra from this component of the SEI at reasonable timeframes...
February 14, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28193519/thiamine-deficiency-induces-endoplasmic-reticulum-stress-and-oxidative-stress-in-human-neurons-derived-from-induced-pluripotent-stem-cells
#6
Xin Wang, Mei Xu, Jacqueline A Frank, Zun-Ji Ke, Jia Luo
Thiamine (vitamin B1) deficiency (TD) plays a major role in the etiology of Wernicke's encephalopathy (WE) which is a severe neurological disorder. TD induces selective neuronal cell death, neuroinflammation, endoplasmic reticulum (ER) stress and oxidative stress in the brain which are commonly observed in many aging-related neurodegenerative diseases, such as Alzheimer's disease (AD), Parkinson's disease (PD), Huntington's disease (HD) and progressive supranuclear palsy (PSP). However, the underlying cellular and molecular mechanisms remain unclear...
February 11, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28189087/a-ferromagnetic-shim-insert-for-nmr-magnets-towards-an-integrated-gyrotron-for-dnp-nmr-spectroscopy
#7
Herbert Ryan, Jan van Bentum, Thorsten Maly
In recent years high-field Dynamic Nuclear Polarization (DNP) enhanced NMR spectroscopy has gained significant interest. In high-field DNP-NMR experiments (⩾400MHz (1)H NMR, ⩾9.4T) often a stand-alone gyrotron is used to generate high microwave/THz power to produce sufficiently high microwave induced B1e fields at the position of the NMR sample. These devices typically require a second, stand-alone superconducting magnet to operate. Here we present the design and realization of a ferroshim insert, to create two iso-centers inside a commercially available wide-bore NMR magnet...
February 5, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28185392/thrombotic-valvular-dysfunction-with-transcatheter-mitral-interventions-for-postsurgical-failures
#8
Marvin H Eng, Adam Greenbaum, Dee Dee Wang, Janet Wyman, Dnp, Heider Arjomand, Pradeep Yadav, Hassan Nemeh, Gaetano Paone, Mayra Guerrero, William O'Neill
BACKGROUND: Degenerated surgical mitral valve repairs or surgical prostheses are currently being treated with transcatheter mitral valve replacement (TMVR). We report the procedural and mid-term assessment of thirteen cases. METHODS: From 12/2013 to 12/2015, 13 consecutive patients with degenerated mitral valve repair or valve replacement were treated. Patients were assessed for mitral valve academic valve consortium (MVARC) defined outcomes. RESULTS: Immediate procedural MVARC defined technical success was 92%...
February 10, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28184389/oxygen-17-dynamic-nuclear-polarisation-enhanced-solid-state-nmr-spectroscopy-at-18-8-t
#9
Nick J Brownbill, David Gajan, Anne Lesage, Lyndon Emsley, Frédéric Blanc
We report (17)O dynamic nuclear polarisation (DNP) enhanced solid-state NMR experiments at 18.8 T. Several formulations were investigated on the Mg(OH)2 compound. A signal enhancement factor of 17 could be obtained when the solid particles were incorporated into a glassy o-terphenyl matrix doped with BDPA using the Overhauser polarisation transfer scheme whilst the cross effect mechanism enabled by TEKPol yielded a slightly lower enhancement but more time efficient data acquisition.
February 10, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28183023/molecular-dynamics-based-selectivity-for-fast-field-cycling-relaxometry-by-overhauser-and-solid-effect-dynamic-nuclear-polarization
#10
Oliver Neudert, Carlos Mattea, Siegfried Stapf
In the last decade nuclear spin hyperpolarization methods, especially Dynamic Nuclear Polarization (DNP), have provided unprecedented possibilities for various NMR techniques by increasing the sensitivity by several orders of magnitude. Recently, in-situ DNP-enhanced Fast Field Cycling (FFC) relaxometry was shown to provide appreciable NMR signal enhancements in liquids and viscous systems. In this work, a measurement protocol for DNP-enhanced NMR studies is introduced which enables the selective detection of nuclear spin hyperpolarized by either Overhauser effect or solid effect DNP...
January 21, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28169889/time-to-define-the-dnp-capstone-project
#11
Ann M Mayo
No abstract text is available yet for this article.
March 2017: Clinical Nurse Specialist CNS
https://www.readbyqxmd.com/read/28167223/anti-allergic-activity-of-2-4-6-trihydroxy-3-geranylacetophenone-thga-via-attenuation-of-ige-mediated-mast-cell-activation-and-inhibition-of-passive-systemic-anaphylaxis
#12
Ji Wei Tan, Daud Ahmad Israf, Hanis Hazeera Harith, Nur Fariesha Md Hashim, Chean Hui Ng, Khozirah Shaari, Chau Ling Tham
tHGA, a geranyl acetophenone compound originally isolated from a local shrub called Melicope ptelefolia, has been previously reported to prevent ovalbumin-induced allergic airway inflammation in a murine model of allergic asthma by targeting cysteinyl leukotriene synthesis. Mast cells are immune effector cells involved in the pathogenesis of allergic diseases including asthma by releasing cysteinyl leukotrienes. The anti-asthmatic properties of tHGA could be attributed to its inhibitory effect on mast cell degranulation...
February 4, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28159302/2d-dige-as-a-proteomic-biomarker-discovery-tool-in-environmental-studies-with-procambarus-clarkii
#13
Ricardo Fernández-Cisnal, Miguel A García-Sevillano, José L Gómez-Ariza, Carmen Pueyo, Juan López-Barea, Nieves Abril
: A 2D-DIGE/MS approach was used to assess protein abundance differences in the red swamp crayfish Procambarus clarkii from polluted aquatic ecosystems of Doñana National Park and surrounding areas with different pollution loads. Procambarus clarkii accumulated metals in the digestive glands and gills reflecting sediment concentrations. We first stated that, probably related to elements accumulation, pollution increased oxidative damage in P. clarkii tissues, as shown by the thiol oxidation status of proteins and MDA levels...
January 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28157561/indirect-detection-of-infinite-speed-mas-solid-state-nmr-spectra
#14
Frédéric A Perras, Amrit Venkatesh, Michael P Hanrahan, Tian Wei Goh, Wenyu Huang, Aaron J Rossini, Marek Pruski
Heavy spin-1/2 nuclides are known to possess very large chemical shift anisotropies that can challenge even the most advanced magic-angle-spinning (MAS) techniques. Wide manifolds of overlapping spinning sidebands and insufficient excitation bandwidths often obfuscate meaningful spectral information and force the use of static, low-resolution solid-state (SS)NMR methods for the characterization of materials. To address these issues, we have merged fast-magic-angle-turning (MAT) and dipolar heteronuclear multiple-quantum coherence (D-HMQC) experiments to obtain D-HMQC-MAT pulse sequences which enable the rapid acquisition of 2D SSNMR spectra that correlate isotropic (1)H chemical shifts to the indirectly detected isotropic "infinite-MAS" spectra of heavy spin-1/2 nuclides...
January 18, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28154306/taste-masking-effect-of-chlorogenic-acid-cga-on-bitter-drugs-evaluated-by-taste-sensor-and-surface-plasmon-resonance-on-the-basis-of-cga-drug-interactions
#15
Sayuko Shiraishi, Tamami Haraguchi, Saki Nakamura, Dahong Li, Honami Kojima, Miyako Yoshida, Takahiro Uchida
The purpose of this study was to evaluate the taste-masking effects of chlorogenic acid (CGA) on bitter drugs using taste sensor measurements and surface plasmon resonance (SPR) analysis of CGA-drug interactions. Six different bitter drugs were used: amlodipine besylate (AMD), diphenhydramine hydrochloride (DPH), donepezil hydrochloride (DNP), rebamipide (RBM), diclofenac sodium (DCF) and etodolac (ETD). Taste sensor outputs were significantly inhibited by the addition of CGA to all drugs. The inhibition ratio of the taste sensor output decreased in the following order DPH>DNP>AMD≈DCF≈RBM≈ETD...
2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28147646/hyperpolarization-of-nitrogen-15-nuclei-by-cross-polarization-and-dissolution-dynamic-nuclear-polarization
#16
Jonas Milani, Basile Vuichoud, Aurélien Bornet, Roberto Melzi, Sami Jannin, Geoffrey Bodenhausen
Dynamic Nuclear Polarization (DNP) is often achieved by the direct transfer of polarization from electrons to nuclei such as (13)C, induced by microwave saturation of the wings of narrow EPR lines of radicals like trityl. In the indirect approach on the other hand, DNP is used to transfer the polarization from the electrons of radicals such as nitroxides that have broad EPR lines to nuclear spins I = (1)H, followed by cross-polarization (CP) from I = (1)H to S = (13)C or other nuclei with low gyromagnetic ratios...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28147551/communication-dissolution-dnp-reveals-a-long-lived-deuterium-spin-state-imbalance-in-methyl-groups
#17
Aditya Jhajharia, Emmanuelle M M Weber, James G Kempf, Daniel Abergel, Geoffrey Bodenhausen, Dennis Kurzbach
We report the generation and observation of long-lived spin states in deuterated methyl groups by dissolution DNP. These states are based on population imbalances between manifolds of spin states corresponding to irreducible representations of the C3v point group and feature strongly dampened quadrupolar relaxation. Their lifetime depends on the activation energies of methyl group rotation. With dissolution DNP, we can reduce the deuterium relaxation rate by a factor up to 20, thereby extending the experimentally available time window...
January 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28139803/synthesis-of-tri-functionalized-mmp2-fret-probes-using-a-chemo-selective-and-late-stage-modification-of-unprotected-peptides
#18
Sean Oriana, Ye Cai, Jeffrey W Bode, Yoko Yamakoshi
A polymeric FRET probe for the detection of MMP2 was prepared using a new N-hydroxylamine derivative of lysine (1), which was successfully incorporated into the natural peptide sequence by solid phase peptide synthesis (SPPS). Following the attachment of a PEG group to the N-terminus, a peptide was cleaved from the resin. The fully-deprotected peptide-PEG conjugate was subsequently subjected to the α-ketoacid-hydroxylamine (KAHA) ligation and Michael addition of FRET donor (MCA) and acceptor (DNP) moieties, respectively...
January 31, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28134945/surface-selective-direct-17-o-dnp-nmr-of-ceo2-nanoparticles
#19
Michael A Hope, David M Halat, Pieter C M M Magusin, Subhradip Paul, Luming Peng, Clare P Grey
Surface-selective direct (17)O DNP has been demonstrated for the first time on CeO2 nanoparticles, for which the first three layers can be distinguished with high selectivity. Polarisation build-up curves show that the polarisation of the (sub-)surface sites builds up faster than the bulk, accounting for the remarkable surface selectivity.
February 9, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28131916/low-concentration-of-uncouplers-of-oxidative-phosphorylation-decreases-the-tnf-induced-endothelial-permeability-and-lethality-in-mice
#20
Vlada V Zakharova, Olga Yu Pletjushkina, Ivan I Galkin, Roman A Zinovkin, Boris V Chernyak, Dmitri V Krysko, Claus Bachert, Olga Krysko, Vladimir P Skulachev, Ekaterina N Popova
Mitochondrial dysfunctions occur in many diseases linked to the systemic inflammatory response syndrome (SIRS). Mild uncoupling of oxidative phosphorylation is known to rescue model animals from pathologies related to mitochondrial dysfunctions and overproduction of reactive oxygen species (ROS). To study the potential of SIRS therapy by uncoupling, we tested protonophore dinitrophenol (DNP) and a free fatty acid (FFA) anion carrier, lipophilic cation dodecyltriphenylphosphonium (C12TPP) in mice and in vitro models of SIRS...
January 26, 2017: Biochimica et Biophysica Acta
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