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https://www.readbyqxmd.com/read/28735008/trehalose-induced-structural-modulation-of-bovine-serum-albumin-at-ambient-temperature
#1
Ahana Das, Pijush Basak, Rudradip Pattanayak, Turban Kar, Rajib Majumder, Debadrita Pal, Anindita Bhattacharya, Maitree Bhattacharyya, Samudra Prosad Banik
Trehalose is a well-known protein stabilizing osmolyte. The present study has been designed to understand the interaction of trehalose with BSA at ambient temperature. Steady state fluorescence and life-time analysis along with CD, DLS and ITC have been employed to show that trehalose causes surface-associated structural perturbation of BSA to promote its compaction. Trehalose at 0.1M concentration resulted in increased solvent exposure of one of the two tryptophans of BSA with a 5nm redshift in emission and enhanced susceptibility to acrylamide quenching with an increase in KSV from 2...
July 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28727856/systematic-studies-of-the-interactions-between-a-model-polyphenol-compound-and-microbial-%C3%AE-glucosidases
#2
Viviam M da Silva, Juliana A P Sato, Juscemácia N Araujo, Fabio M Squina, João R C Muniz, Karin A Riske, Wanius Garcia
Lignin is a major obstacle for cost-effective conversion of cellulose into fermentable sugars. Non-productive adsorption onto insoluble lignin fragments and interactions with soluble phenols are important inhibition mechanisms of cellulases, including β-glucosidases. Here, we examined the inhibitory effect of tannic acid (TAN), a model polyphenolic compound, on β-glucosidases from the bacterium Thermotoga petrophila (TpBGL1 and TpBGL3) and archaeon Pyrococcus furiosus (PfBGL1). The results revealed that the inhibition effects on β-glucosidases were TAN concentration-dependent...
2017: PloS One
https://www.readbyqxmd.com/read/28708944/indirect-comparison-of-bronchial-thermoplasty-versus-omalizumab-for-uncontrolled-severe-asthma
#3
Robert M Niven, Michael R Simmonds, Michael J Cangelosi, Dominic P Tilden, Suzanne Cottrell, Narinder S Shargill
OBJECTIVE: Bronchial thermoplasty (BT) as an add-on therapy for uncontrolled severe asthma is an alternative to biologic therapies like omalizumab (OM). We conducted an indirect treatment comparison (ITC) to appraise comparative effectiveness of BT and OM. METHODS: A systematic literature review identified relevant randomized controlled trials. The ITC followed accepted methodology. RESULTS: The ITC comprised a sham-controlled trial of BT (AIR2) and two placebo-controlled trials of OM (INNOVATE; EXTRA)...
July 14, 2017: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/28708402/two-step-micellization-model-the-case-of-long-chain-carboxylates-in-water
#4
Ziga Medos, Marija Bester-Rogac
The micellization behaviour of the long-chain carboxylates: sodium and potassium octanoate (NaC8, KC8), sodium decanoate (NaC10), potassium decanoate (KC10), caesium decanoate (CsC10), choline decanoate (ChC10) and sodium dodecanoate (NaC12) in aqueous solutions were studied using isothermal titration calorimetry (ITC) in the temperature range between 288.15 and 328.15 K. Experimental data were analysed by help of improved model treating the micellization process as a two-step process. Furthermore, consideration of the state of the stock and titrated solutions during the experiment, allowed the elimination of all usually used empirical parameters...
July 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28705212/moringa-isothiocyanate-complexed-with-%C3%AE-cyclodextrin-a-new-perspective-in-neuroblastoma-treatment
#5
Sabrina Giacoppo, Renato Iori, Patrick Rollin, Placido Bramanti, Emanuela Mazzon
BACKGROUND: Several lines of evidence suggest the consume of natural products for cancer prevention or treatment. In particular, isothiocyanates (ITCs) exerting anti-cancer properties, have received great interest as potential chemotherapeutic agents. This study was designed to assess the anti-proliferative activities of a new preparation of Moringa oleifera-derived 4-(α-L-rhamnopyranosyloxy)benzyl ITC (moringin) complexed with alpha-cyclodextrin (moringin + α-CD; MAC) on SH-SY5Y human neuroblastoma cells...
July 14, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28702532/a-supramolecular-miktoarm-star-polymer-based-on-porphyrin-metal-complexation-in-water
#6
Zhanyao Hou, Wim Dehaen, Joël Lyskawa, Patrice Woisel, Richard Hoogenboom
A novel supramolecular miktoarm star polymer was successfully constructed in water from a pyridine end-decorated polymer (Py-PmDEGA) and a metalloporphyrin based star polymer (ZnTPP-(PEG)4) via metal-ligand coordination. The Py-PmDEGA moiety was prepared via a combination of reversible addition-fragmentation chain transfer polymerization (RAFT) and subsequent aminolysis and Michael addition reactions to introduce the pyridine end-group. The ZnTPP(PEG)4 star-polymer was synthesized by the reaction between tetrakis(p-hydroxyphenyl)porphyrin and toluenesulfonyl-PEG, followed by insertion of a zinc ion into the porphyrin core...
July 12, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28701585/banning-tobacco-price-promotions-smoking-related-beliefs-and-behaviour-findings-from-the-international-tobacco-control-four-country-itc-4c-survey
#7
Sherine El-Toukhy, Kelvin Choi, Sara C Hitchman, Maansi Bansal-Travers, James F Thrasher, Hua-Hie Yong, Richard J O'Connor, Ce Shang
BACKGROUND: Ecological models emphasise multilevel influences on health behaviours. While studies show that exposure to price promotions is associated with smoking behaviour and its antecedents, less is known about whether these associations differ by macro-level factors such as national price promotion policies. METHODS: Current and former smokers (N=4698) from the International Tobacco Control Policy Evaluation Project four-country cohort were included in weighted multivariate logistic regression models to examine individual-level associations between exposure to price promotions at waves 7 and 8 (conducted in 2008-2009 and 2010-2011) and beliefs (social and injunctive norms, functional value of smoking, misconceptions around smoking and beliefs of tobacco industry and its regulations) and behaviour at wave 8, stratified by whether countries allow (Australia and USA) or ban (Canada and UK) price promotions...
July 12, 2017: Tobacco Control
https://www.readbyqxmd.com/read/28696692/evaluating-force-field-performance-in-thermodynamic-calculations-of-cyclodextrin-host-guest-binding-water-models-partial-charges-and-host-force-field-parameters
#8
Niel M Henriksen, Michael K Gilson
Computational prediction of noncovalent binding free energies with methods based on molecular mechanical force fields has become increasingly routine in drug discovery projects, where they promise to speed the discovery of small molecule ligands to bind targeted proteins with high affinity. Because the reliability of free energy methods still has significant room for improvement, new force fields, or modifications of existing ones, are regularly introduced with the aim of improving the accuracy of molecular simulations...
July 11, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28690169/unraveling-the-thermodynamics-binding-mechanism-and-conformational-changes-of-hsa-with-chromolyn-sodium-multispecroscopy-isothermal-titration-calorimetry-and-molecular-docking-studies
#9
Shama Yasmeen, Riyazuddeen, Faizan Abul Qais
Cromolyn sodium is an anti-allergic drug effective for treatment in asthma and allergic rhinitis. In this project, interaction of chromolyn sodium (CS) with human serum (HSA) has been investigated by various techniques such as UV-vis, fluorescence, circular dichorism (CD), fourier transform infrared (FT-IR) spectroscopy, isothermal titration calorimetric (ITC) and molecular docking. The fluorescence quenching results revealed that there was static quenching mechanism in the interactions of CS with HSA. The binding constant (Kb), enthalpy change (ΔH°), entropy change (ΔS°) and Gibbs free energy change (ΔG°) were calculated...
July 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28686026/interactions-of-phospholipid-vesicles-with-cationic-and-anionic-oligomeric-surfactants
#10
Yao Chen, Fulin Qiao, Yaxun Fan, Yuchun Han, Yilin Wang
This work studied the interactions of 1, 2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) with cationic ammonium surfactants and anionic sulfate or sulfonate surfactants of different oligomeric degrees, including cationic monomeric DTAB, dimeric C12C3C12Br2 and trimeric DDAD as well as anionic monomeric SDS, dimeric C12C3C12(SO3)2 and trimeric TED-(C10SO3Na)3. The partition coefficient P of these surfactants between the DOPC vesicles and water was determined with isothermal titration microcalorimetry (ITC) by titrating concentrated DOPC solution into the monomer solution of these surfactants...
July 7, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28682066/charge-effect-on-the-formation-of-polyoxometalate-based-supramolecular-polygons-driven-by-metal-coordination
#11
Madeleine Piot, Sébastien Hupin, Hélène Lavanant, Carlos Afonso, Laurent Bouteiller, Anna Proust, Guillaume Izzet
The metal-driven self-assembly of a Keggin-based hybrid bearing two remote pyridine units was investigated. The resulting supramolecular species were identified by combination of 2D diffusion NMR spectroscopy (DOSY) and electrospray ionization mass spectrometry (ESI-MS) as a mixture of molecular triangles and squares. This behavior is different from that of the structural analogue Dawson-based hybrid displaying a higher charge, which only led to the formation of molecular triangles. This study highlights the decisive effect of the charge of the POMs in their self-assembly processes that disfavors the formation of large assemblies...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28676872/precipitating-polyelectrolyte-surfactant-systems-by-admixing-a-nonionic-surfactant-a-case-of-cononsurfactancy
#12
Leonardo Chiappisi, Stephen David Leach, Michael Gradzielski
The formation of water insoluble polyelectrolyte/surfactant complexes (PESCs) upon mixing two homogeneous polycation/anionic surfactant and polycation/nonionic surfactant solutions is reported here. This phase separation is unexpected and differs markedly from the commonly observed enhanced solubility of colloidal systems in mixed surfactant systems. The study was performed on mixtures of the cationic biopolysaccharide chitosan (poly d-glucosamine) and mixed micelles composed of an ethoxylated fatty alcohol and its carboxylic acid terminated equivalent...
July 5, 2017: Soft Matter
https://www.readbyqxmd.com/read/28668871/the-sentinel-node-with-isolated-breast-tumor-cells-or-micrometastases-benefits-and-risks-of-axillary-dissection
#13
Vilma Madekivi, Pia Boström, Ritta Aaltonen, Tero Vahlberg, Eeva Salminen
BACKGROUND/AIM: Sentinel lymph node (SLN) biopsy has become the standard procedure to identify metastases in axillary nodes in breast cancer. Even after careful SLN examination additional micrometastases and isolated tumor cells (ITCs) are sometimes found, resulting in a need for delayed axillary lymph node dissection (ALND). This study was undertaken to assess prognostic factors identifying additional axillary lymph node (ALN) metastases at delayed ALND. PATIENTS AND METHODS: To define the impact of late ALND regarding their outcome, 162 breast cancer patients with 169 operated breasts treated between 2010 and 2012 were evaluated, with follow-up through 2016...
July 2017: Anticancer Research
https://www.readbyqxmd.com/read/28667328/eeg-correlates-of-sensorimotor-processing-independent-components-involved-in-sensory-and-motor-processing
#14
Andrew Melnik, W David Hairston, Daniel P Ferris, Peter König
Sensorimotor processing is a critical function of the human brain with multiple cortical areas specialised for sensory recognition or motor execution. Although there has been considerable research into sensorimotor control in humans, the steps between sensory recognition and motor execution are not fully understood. To provide insight into brain areas responsible for sensorimotor computation, we used complex categorization-response tasks (variations of a Stroop task requiring recognition, decision-making, and motor responses) to test the hypothesis that some functional modules are participating in both sensory as well as motor processing...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28664559/comparison-of-the-intradermal-irritant-threshold-concentrations-of-nine-allergens-from-two-different-manufacturers-in-clinically-nonallergic-dogs-in-the-usa
#15
Desirae A Foust-Wheatcraft, Darin L Dell, Wayne S Rosenkrantz, Craig E Griffin
BACKGROUND: The intradermal irritant threshold concentration for many allergens is unknown. OBJECTIVE: To determine the intradermal irritant threshold concentration (ITC) of nine allergens from two different manufacturers. ANIMALS: Twenty privately owned clinically nonallergic dogs. METHODS: Alternaria, cat dander, Dermatophagoides farinae, Chenopodium album (lamb's quarter), Xanthium strumarium (cocklebur), Prosopis glandulosa (mesquite), Morus alba (white mulberry), Cynodon dactylon (Bermuda grass) and Phleum pretense (Timothy grass) from two manufacturers (ALK; Round Rock, TX, USA and Greer(®) Laboratories; Lenoir, NC, USA) were injected intradermally at two dilutions and at 15 and 30 min evaluated subjectively (1-4) and objectively (horizontal wheal diameter) by two blinded investigators...
June 29, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/28663124/comparative-evaluation-of-vortioxetine-as-a-switch-therapy-in-patients-with-major-depressive-disorder
#16
Michael E Thase, Natalya Danchenko, Melanie Brignone, Ioana Florea, Francoise Diamand, Paula L Jacobsen, Eduard Vieta
Switching antidepressant therapy is a recommended strategy for depressed patients who neither respond to nor tolerate an initial pharmacotherapy course. This paper reviews the efficacy and tolerability of switching to vortioxetine. All three published studies of patients with major depressive disorder (MDD) switched from SSRI/SNRI therapy to vortioxetine due to lack of efficacy or tolerability were selected. Vortioxetine was evaluated versus agomelatine directly (REVIVE) and versus sertraline, venlafaxine, bupropion, and citalopram in an indirect treatment comparison (ITC) from switch studies retrieved in a literature review...
June 26, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28662962/structure-activity-relationship-studies-of-g9a-like-protein-glp-inhibitors
#17
Yan Xiong, Fengling Li, Nicolas Babault, Hong Wu, Aiping Dong, Hong Zeng, Xin Chen, Cheryl H Arrowsmith, Peter J Brown, Jing Liu, Masoud Vedadi, Jian Jin
Given the high homology between the protein lysine methyltransferases G9a-like protein (GLP) and G9a, it has been challenging to develop potent and selective inhibitors for either enzyme. Recently, we reported two quinazoline compounds, MS0124 and MS012, as GLP selective inhibitors. To further investigate the structure-activity relationships (SAR) of the quinazoline scaffold, we designed and synthesized a range of analogs bearing different 2-amino substitutions and evaluated their inhibition potencies against both GLP and G9a...
June 19, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28654751/substrate-recognition-mechanism-of-the-putative-yeast-carnosine-n-methyltransferase
#18
Xiwen Liu, Jialiang Wu, Yujie Sun, Wei Xie
Anserine (β-alanyl-N(Pi) -methyl-L-histidine) is a natural metabolite present in skeletal muscle and the central nervous system of vertebrates, and plays important physiological roles in living organisms. The production of anserine is catalyzed by carnosine N-methyltransferases, which transfer a methyl group to carnosine (β-alanyl-L-histidine). However, the structural basis of the substrate recognition for the enzymes is unknown. We present the crystal structure of the putative carnosine N-methyltransferase from yeast named YNL092W in complex with SAH, solved by the single-wavelength anomalous dispersion (SAD) method...
June 27, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28644006/structure-of-the-forkhead-domain-of-foxa2-bound-to-a-complete-dna-consensus-site
#19
Jun Li, Ana Carolina Dantas Machado, Ming Guo, Jared M Sagendorf, Zhan Zhou, Longying Jiang, Xiaojuan Chen, Daichao Wu, Lingzhi Qu, Zhuchu Chen, Lin Chen, Remo Rohs, Yongheng Chen
FOXA2, a member of the forkhead family of transcription factors, plays essential roles in liver development and bile acid homeostasis. In this study, we report a 2.8 Å co-crystal structure of the FOXA2 DNA-binding domain (FOXA2-DBD) bound to a DNA duplex containing a forkhead consensus binding site (GTAAACA). The FOXA2-DBD adopts the canonical winged-helix fold, with helix H3 and wing 1 regions mainly mediating the DNA recognition. Although the wing 2 region was not defined in the structure, isothermal titration calorimetry assays suggested that this region was required for optimal DNA binding...
July 11, 2017: Biochemistry
https://www.readbyqxmd.com/read/28629859/s-adenosyl-l-homocysteine-hydrolase-from-a-hyperthermophile-thermotoga-maritima-is-expressed-in-escherichia-coli-in-inactive-form-biochemical-and-structural-studies
#20
Krzysztof Brzezinski, Justyna Czyrko, Joanna Sliwiak, Edyta Nalewajko-Sieliwoniuk, Mariusz Jaskolski, Boguslaw Nocek, Zbigniew Dauter
Thermotoga maritima is a hyperthermophilic bacterium but its genome encodes a number of archaeal proteins including S-adenosyl-L-homocysteine hydrolase (SAHase), which regulates cellular methylation reactions. The question of proper folding and activity of proteins of extremophilic origin is an intriguing problem. When expressed in E.coli and purified (as a homotetramer) at room temperature, the hyperthermophilic SAHase from T.maritima was inactive. ITC study indicated that the protein undergoes heat-induced conformational changes, and enzymatic activity assays demonstrated that these changes are required to attain enzymatic activity...
June 16, 2017: International Journal of Biological Macromolecules
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