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https://www.readbyqxmd.com/read/29149597/structural-basis-for-shelterin-bridge-assembly
#1
Jin-Kwang Kim, Jinqiang Liu, Xichan Hu, Clinton Yu, Kyle Roskamp, Banumathi Sankaran, Lan Huang, Elizabeth A Komives, Feng Qiao
Telomere elongation through telomerase enables chromosome survival during cellular proliferation. The conserved multifunctional shelterin complex associates with telomeres to coordinate multiple telomere activities, including telomere elongation by telomerase. Similar to the human shelterin, fission yeast shelterin is composed of telomeric sequence-specific double- and single-stranded DNA-binding proteins, Taz1 and Pot1, respectively, bridged by Rap1, Poz1, and Tpz1. Here, we report the crystal structure of the fission yeast Tpz1(475-508)-Poz1-Rap1(467-496) complex that provides the structural basis for shelterin bridge assembly...
November 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29149592/dynamics-under-the-telomeric-bridge
#2
Sabrina Pisano, Eric Gilson, Marie-Josèphe Giraud-Panis
In this issue of Molecular Cell, Kim et al. (2017) have studied the structure and organization of the shelterin protein complex protecting telomeres in Schizosaccharomyces pombe and humans and discovered an allosteric structural transition that drives the formation of the shelterin complex and participates in telomere length regulation.
November 16, 2017: Molecular Cell
https://www.readbyqxmd.com/read/29149564/binding-thermodynamics-and-kinetics-calculations-using-chemical-host-and-guest-a-comprehensive-picture-of-molecular-recognition
#3
Zhiye Tang, Chia-En A Chang
Understanding the fine balance between changes of entropy and enthalpy and the competition between a guest and water molecules in molecular binding is crucial in fundamental studies and practical applications. Experiments provide measurements. However, illustrating the binding/unbinding processes gives a complete picture of molecular recognition not directly available from experiments, and computational methods bridge the gaps. Here, we investigated guest association/dissociation with β-cyclodextrin (β-CD) by using microsecond-timescale molecular dynamics (MD) simulations, post-analysis and numerical calculations...
November 17, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29149258/edge-to-edge-repair-for-mitral-regurgitation-associated-with-isolated-double-orifice-mitral-valve
#4
Takeshi Oda, Takanori Kono, Keiichi Akaiwa, Katsuhiko Nakamura
We report the case of a patient with severe mitral regurgitation who was diagnosed with double-orifice mitral valve by preoperative transthoracic and transoesophageal echocardiography. During surgery, it was revealed that the mitral valve was divided into 2 orifices, anterolateral and posteromedial, by a fibrous bridging tissue that was supported by the chordae tendineae originating from an accessory middle papillary muscle. The posterior scallop of the anterolateral orifice was prolapsed due to chordal elongation...
November 15, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29149097/acute-coronary-disease-prognosis-and-prevalence-of-risk-factors-in-young-adults
#5
REVIEW
Alvaro Gudiño Gomezjurado, Bianca Pujol Freitas, Flavia Contreira Longatto, Juliana Negrisoli, Gustavo Aguiar Sousa
Acute coronary disease is a rare entity in young people and is mostly related to atherosclerotic disease. However, other causes such as myocardial bridges, coronary artery dissection and antiphospholipid syndrome may be present. The prognosis of the disease in this group of patients is favorable; although women may have a higher morbidity because diagnosis and treatment can be delayed. The goal of this review is to update the knowledge about risk factors and prognosis of young patients with an acute coronary event compared to the older population...
November 9, 2017: Medwave
https://www.readbyqxmd.com/read/29149011/quality-a-bridge-from-guidelines-to-practice
#6
Daniela Nasu Monteiro Medeiros, Cristiane Freitas Pizarro, Marta Pessoa Cardoso, Audrey Rie Ogawa Shibata, Eduardo Juan Troster
No abstract text is available yet for this article.
December 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/29148819/unveiling-structural-motions-of-a-highly-fluorescent-superphotoacid-by-locking-and-fluorinating-the-gfp-chromophore-in-solution
#7
Cheng Chen, Weimin Liu, Mikhail S Baranov, Nadezhda S Baleeva, Ilia V Yampolsky, Liangdong Zhu, Yanli Wang, Alexandra Shamir, Kyril M Solntsev, Chong Fang
Super-photoacidity involves ultrafast proton motions implicated in numerous chemical and biological processes. We used conformational locking and strategic addition of electron-withdrawing substituents to synthesize a new GFP-chromophore analog: p-HO-3,5-diF-BDI:BF2 (diF). It is highly fluorescent and exhibits excited-state proton transfer (ESPT) in various solvents, placing it among the strongest photoacids. Tunable femtosecond stimulated Raman spectroscopy with unique resonance conditions and transient absorption are complementarily employed to elucidate structural basis for super-photoacidity...
November 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29148812/behavior-of-a-liquid-bridge-between-nonparallel-hydrophobic-surfaces
#8
Mohammadmehdi Ataei, Huanchen Chen, Alidad Amirfazli
When a liquid bridge is formed between two nonparallel identical surfaces, it can move along the surfaces. Literature indicates that the direction of bridge movement is governed by the wettability of surfaces. When the surfaces are hydrophilic, the motion of the bridge is always towards the cusp (intersection of the plane of the two bounding surfaces). While, the movement is hitherto thought to be always pointing away from the cusp, when the surfaces are hydrophobic. In this study, through experiments, numerical simulations, and analytical reasoning, we demonstrate that for hydrophobic surfaces, wettability is not the only factor determining the direction of the motion...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148737/site-specific-one-to-one-click-coupling-of-single-proteins-to-individual-carbon-nanotubes-a-single-molecule-approach
#9
Mark Freeley, Harley Worthy, Rochelle Ahmed, Ben Bowen, Daniel Watkins, John Emyr Macdonald, Ming Zheng, Darran Dafydd Jones, Matteo Palma
We report the site-specific coupling of single proteins to individual carbon nanotubes (CNTs) in solution and with single-molecule control. Using an orthogonal Click reaction, Green Fluorescent Protein (GFP) was engineered to contain a genetically encoded azide group and then bound to CNT ends in different configurations: in close proximity or at longer distances from the GFP's functional centre. Atomic force microscopy and fluorescence analysis in solution and on surfaces at the single-protein level confirmed the importance of bioengineering optimal protein attachment sites to achieve direct protein-nanotube communication and bridging...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148628/clinical-significance-of-st-depression-at-exercise-stress-testing-in-competitive-athletes-usefulness-of-coronary-ct-during-screening
#10
Fabio Sperandii, Emanuele Guerra, Eliana Tranchita, Carlo Minganti, Chiara Lanzillo, Antonia Nigro, Federico Quaranta, Attilio Parisi, Mauro DI Roma, Luciano Maresca, Federica Fagnani, Leonardo Calò
BACKGROUND: Congenital coronary anomalies (CCAs) and coronary artery disease (CAD) arouse intense scientific and clinical interest in sports medicine and sports cardiology medical communities because of their potential to trigger sudden cardiac death (SCD) in athletes. Exercise stress testing represent the first instrumental assessment to evaluate electrocardiographic changes during effort. Coronary computed tomography angiography (CCTA) is an advanced accurate noninvasive imaging modality for excluding CAD and abnormalities of origin and course of coronary vessels...
November 17, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29148553/rare-earth-metal-organic-complexes-constructed-from-hydroxyl-and-carboxyl-modified-arenesulfonate-syntheses-structure-evolutions-and-ultraviolet-visible-and-near-infrared-luminescence
#11
Ying-Hui Xiao, Zhao-Peng Deng, Zhi-Biao Zhu, Li-Hua Huo, Shan Gao
The reaction of 2-hydroxyl-4-carboxylbenzenesulfonic acid (H3L) and rare earth (RE) metal nitrates together with two N-heterocyclic ligands gives rise to the formation of 38 complexes, namely, [La(H2L)2(ox)0.5(H2O)4]n·2nH2O (1-La) (ox = oxalate), [RE2(H2L)2 (ox)(H2O)12]·2(H2L)·8H2O (2-RE) (RE = Nd, Sm, Eu, Gd, Tb, Dy), [RE(SO4)(H2O)7]·(H2L)·3H2O (3-RE) (RE = Ho, Er, Tm, Yb, Lu and Y), [RE(L)(H2O)3]n·nH2O (4-RE) (RE = Er, Tm, Yb and Lu), [RE(L)(2,2'-bipy)(H2O)]n (5-RE) (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Y, 2,2'-bipy = 2,2'-bipyridine), [RE(L)(1,10-phen)(H2O)]n (6-RE) (RE = La, Pr, Nd, Sm, Eu, 1,10-phen = 1,10-phenanthroline), and [RE(L')(1,10-phen)2(H2O)]n (7-RE) (RE = Gd, Tb, Ho, Er, Yb and Lu, H3L' = 2-hydroxy-3-nitro-4-carboxybenzenesulfonic acid), which have been characterized by elemental analysis, IR, TG, PL, powder and single-crystal X-ray diffraction...
November 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29148249/frailty-in-nonagenarians-a-bridge-too-far
#12
EDITORIAL
Mohammad Morad, William A Gray
There is no clear consensus about the definition of frailty and how to accurately measure it. There is accumulating evidence that frail old patients have worse outcomes after TAVR compared to non-frail patients. Further randomized research is needed to confirm those concerns and to standardize the role of frailty assessment in patient selection for TAVR.
November 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29147898/-don-t-mind-the-gap-reflections-on-improvement-science-as-a-paradigm
#13
Trenholme Junghans
Responding to this issue's invitation to bring new disciplinary insights to the field of improvement science, this article takes as its starting point one of the field's guiding metaphors: the imperative to "mind the gap". Drawing on insights from anthropology, history, and philosophy, the article reflects on the origins and implications of this metaphoric imperative, and suggests some ways in which it might be in tension with the means and ends of improvement. If the industrial origins of improvement science in the twentieth century inform a metaphor of gaps, chasms, and spaces of misalignment as invariably imperfect and potentially dangerous, and therefore requiring bridging or closure, other currents that feed the discipline of improvement science suggest the potential value and uses of spaces of openness and ambiguity...
November 17, 2017: Health Care Analysis: HCA: Journal of Health Philosophy and Policy
https://www.readbyqxmd.com/read/29147716/complex-coacervation-of-mg-ii-phospho-polymethacrylate-a-synthetic-analog-of-sandcastle-worm-adhesive-phosphoproteins
#14
In Taek Song, Russell J Stewart
The highly phosphorylated Pc3 proteins, major components of the sandcastle worm adhesive, are sequestered with Mg as spherical sub-granules within heterogeneous secretory granules in adhesive gland cells. The phase behavior of a synthetic phospho-polymethacrylate analog of the Pc3 phosphoproteins, in the presense of Mg(ii), was characterized to determine whether it is chemically possible for the natural adhesive components to be packaged and stored as liquid complex coacervates. Of several multivalent metal salts tested, only MgCl induced complex coacervation of the phospho-copolymer...
November 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/29147709/four-one-dimensional-lanthanide-phenylacetate-polymers-exhibiting-luminescence-and-magnetic-cooling-spin-glass-behavior
#15
Zhong-Yi Li, Ya-Lan Xu, Xiang-Fei Zhang, Bin Zhai, Fu-Li Zhang, Jian-Jun Zhang, Chi Zhang, Su-Zhi Li, Guang-Xiu Cao
Four isostructural lanthanide coordination polymers with a phenylacetate (PAA(-)) ligand, [Ln(PAA)3(H2O)]n (Ln = Eu (1); Gd (2); Tb (3); Dy (4)), were synthesized under hydrothermal conditions. Complexes 1-4 display a one-dimensional (1D) wave chain structure bridged by the carboxylate of the PAA(-) ligand, which was generated via the in situ decarboxylation of phenylmalonic acid. Magnetic studies suggest the presence of ferromagnetic LnLn coupling in the 1D chain of 1-4. Meanwhile, 2 has a significant cryogenic magnetocaloric effect with the maximum -ΔSm of 26...
November 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29147620/blinatumomab-bridges-the-gap-between-leukemia-and-immunity
#16
EDITORIAL
Takahiro Yamazaki, Lorenzo Galluzzi
No abstract text is available yet for this article.
2017: Oncoimmunology
https://www.readbyqxmd.com/read/29147524/manipulation-of-cytokine-secretion-in-human-dendritic-cells-using-glycopolymers-with-picomolar-affinity-for-dc-sign
#17
Daniel A Mitchell, Qiang Zhang, Lenny Voorhaar, David M Haddleton, Shan Herath, Anne S Gleinich, Harpal S Randeva, Max Crispin, Hendrik Lehnert, Russell Wallis, Steven Patterson, C Remzi Becer
The human C-type lectin DC-SIGN (CD209) is a significant receptor on the surface of dendritic cells (DCs) - crucial components of host defense that bridge the innate and adaptive immune systems. A range of linear glycopolymers, constructed via controlled radical polymerization techniques have been shown to interact with DC-SIGN with affinities in the physiologically active range. However, these first generation glycopolymers possess limited structural definition and their effects on DCs were not known. Here we report the development of star-shaped mannose glycopolymers with the aim of targeting the clustered domain arrangement of DC-SIGN and these were shown to bind with picomolar affinity...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29147510/formation-and-ligand-based-reductive-chemistry-of-bridged-bis-alkylidene-scandium-iii-complexes
#18
Wangyang Ma, Chao Yu, Yue Chi, Tianyang Chen, Lianjun Wang, Jianhao Yin, Baosheng Wei, Ling Xu, Wen-Xiong Zhang, Zhenfeng Xi
The chemistry of rare-earth carbene and alkylidene complexes including their synthesis, structure and reaction is a challenging issue because of their high reactivity (or instability) and the lack of synthetic methods. In this work, we report the first synthesis of the bridged bis-alkylidene complexes which feature a 2-butene-1,1,4,4-tetraanion and four Sc-C(sp(3)) bonds by the reaction of 1,4-dilithio-1,3-butadienes with ScCl3. This reaction proceeds via two key intermediates: an isolable scandacyclopentadiene and a proposed scandacyclopropene...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29147502/chemical-space-guided-discovery-of-antimicrobial-bridged-bicyclic-peptides-against-pseudomonas-aeruginosa-and-its-biofilms
#19
Ivan Di Bonaventura, Xian Jin, Ricardo Visini, Daniel Probst, Sacha Javor, Bee-Ha Gan, Gaëlle Michaud, Antonino Natalello, Silvia Maria Doglia, Thilo Köhler, Christian van Delden, Achim Stocker, Tamis Darbre, Jean-Louis Reymond
Herein we report the discovery of antimicrobial bridged bicyclic peptides (AMBPs) active against Pseudomonas aeruginosa, a highly problematic Gram negative bacterium in the hospital environment. Two of these AMBPs show strong biofilm inhibition and dispersal activity and enhance the activity of polymyxin, currently a last resort antibiotic against which resistance is emerging. To discover our AMBPs we used the concept of chemical space, which is well known in the area of small molecule drug discovery, to define a small number of test compounds for synthesis and experimental evaluation...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29146928/significant-enhanced-uranyl-ions-extraction-efficiency-with-phosphoramidate-functionalized-ionic-liquids-via-synergistic-effect-of-coordination-and-hydrogen-bond
#20
Xiang Xie, Zhen Qin, Yao He, Penghui Xiong, Zeng Huang, Yiwu Mao, Hongyuan Wei, Liangang Zhuo
The influence of the linking group between the phosphoryl and bridging moieties in phosphoryl-containing task-specific ionic liquids (TSILs) on the extraction of uranyl ions was experimentally and theoretically investigated. A novel phosphoramidate-based TSIL with an amine group as the linking moiety resulted in a higher uranyl ion extraction efficiency compared with that of other phosphoryl-based TSILs. A distribution ratio of 4999 ± 51 can be achieved for uranyl ions. The uranyl ions (76.7 ± 1.5%) were stripped from the loaded ionic liquid phase in a single stage using 0...
November 16, 2017: Scientific Reports
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