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ACS Central Science

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https://www.readbyqxmd.com/read/28386603/unidirectional-transport-mechanism-in-an-atp-dependent-exporter
#1
Yanyan Xu, Anna Seelig, Simon Bernèche
ATP-binding cassette (ABC) transporters use the energy of ATP binding and hydrolysis to move a large variety of compounds across biological membranes. P-glycoprotein, involved in multidrug resistance, is the most investigated eukaryotic family member. Although a large number of biochemical and structural approaches have provided important information, the conformational dynamics underlying the coupling between ATP binding/hydrolysis and allocrite transport remains elusive. To tackle this issue, we performed molecular dynamic simulations for different nucleotide occupancy states of Sav1866, a prokaryotic P-glycoprotein homologue...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386602/magnetic-memory-from-site-isolated-dy-iii-on-silica-materials
#2
Florian Allouche, Giuseppe Lapadula, Georges Siddiqi, Wayne W Lukens, Olivier Maury, Boris Le Guennic, Fabrice Pointillart, Jan Dreiser, Victor Mougel, Olivier Cador, Christophe Copéret
Achieving magnetic remanence at single isolated metal sites dispersed at the surface of a solid matrix has been envisioned as a key step toward information storage and processing in the smallest unit of matter. Here, we show that isolated Dy(III) sites distributed at the surface of silica nanoparticles, prepared with a simple and scalable two-step process, show magnetic remanence and display a hysteresis loop open at liquid (4)He temperature, in contrast to the molecular precursor which does not display any magnetic memory...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386601/on-the-mechanism-of-cytoprotection-by-ferrostatin-1-and-liproxstatin-1-and-the-role-of-lipid-peroxidation-in-ferroptotic-cell-death
#3
Omkar Zilka, Ron Shah, Bo Li, José Pedro Friedmann Angeli, Markus Griesser, Marcus Conrad, Derek A Pratt
Ferroptosis is a form of regulated necrosis associated with the iron-dependent accumulation of lipid hydroperoxides that may play a key role in the pathogenesis of degenerative diseases in which lipid peroxidation has been implicated. High-throughput screening efforts have identified ferrostatin-1 (Fer-1) and liproxstatin-1 (Lip-1) as potent inhibitors of ferroptosis - an activity that has been ascribed to their ability to slow the accumulation of lipid hydroperoxides. Herein we demonstrate that this activity likely derives from their reactivity as radical-trapping antioxidants (RTAs) rather than their potency as inhibitors of lipoxygenases...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386600/novel-solutions-for-vaccines-and-diagnostics-to-combat-brucellosis
#4
Satadru Sekhar Mandal, Lucy Duncombe, N Vijaya Ganesh, Susmita Sarkar, Laurence Howells, Philip J Hogarth, David R Bundle, John McGiven
Brucellosis is diagnosed by detection of antibodies in the blood of animals and humans that are specific for two carbohydrate antigens, termed A and M, which are present concurrently in a single cell wall O-polysaccharide. Animal brucellosis vaccines contain these antigenic determinants, and consequently infected and vaccinated animals cannot be differentiated as both groups produce A and M specific antibodies. We hypothesized that chemical synthesis of a pure A vaccine would offer unique identification of infected animals by a synthetic M diagnostic antigen that would not react with antibodies generated by this vaccine...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386599/catalytic-n2-to-nh3-conversion-by-fe-at-lower-driving-force-a-proposed-role-for-metallocene-mediated-pcet
#5
Matthew J Chalkley, Trevor J Del Castillo, Benjamin D Matson, Joseph P Roddy, Jonas C Peters
We have recently reported on several Fe catalysts for N2-to-NH3 conversion that operate at low temperature (-78 °C) and atmospheric pressure while relying on a very strong reductant (KC8) and acid ([H(OEt2)2][BAr(F)4]). Here we show that our original catalyst system, P3(B)Fe, achieves both significantly improved efficiency for NH3 formation (up to 72% for e(-) delivery) and a comparatively high turnover number for a synthetic molecular Fe catalyst (84 equiv of NH3 per Fe site), when employing a significantly weaker combination of reductant (Cp*2Co) and acid ([Ph2NH2][OTf] or [PhNH3][OTf])...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386598/defining-rna-small-molecule-affinity-landscapes-enables-design-of-a-small-molecule-inhibitor-of-an-oncogenic-noncoding-rna
#6
Sai Pradeep Velagapudi, Yiling Luo, Tuan Tran, Hafeez S Haniff, Yoshio Nakai, Mohammad Fallahi, Gustavo J Martinez, Jessica L Childs-Disney, Matthew D Disney
RNA drug targets are pervasive in cells, but methods to design small molecules that target them are sparse. Herein, we report a general approach to score the affinity and selectivity of RNA motif-small molecule interactions identified via selection. Named High Throughput Structure-Activity Relationships Through Sequencing (HiT-StARTS), HiT-StARTS is statistical in nature and compares input nucleic acid sequences to selected library members that bind a ligand via high throughput sequencing. The approach allowed facile definition of the fitness landscape of hundreds of thousands of RNA motif-small molecule binding partners...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386597/highly-enantioselective-oxidation-of-nonactivated-aliphatic-c-h-bonds-with-hydrogen-peroxide-catalyzed-by-manganese-complexes
#7
Michela Milan, Massimo Bietti, Miquel Costas
Monosubstituted cycloalkanes undergo regio- and enantioselective aliphatic C-H oxidation with H2O2 catalyzed by biologically inspired manganese catalysts. The reaction furnishes the corresponding ketones resulting from oxidation at C3 and C4 methylenic sites (K3 and K4, respectively) leading to a chiral desymmetrization that proceeds with remarkable enantioselectivity (64% ee) but modest regioselectivity at C3 (K3/K4 ≈ 2) for tert-butylcyclohexane, and with up to 96% ee and exquisite regioselectity toward C3 (up to K3/K4 > 99) when N-cyclohexylalkanamides are employed as substrates...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386596/grafting-charged-species-to-membrane-embedded-scaffolds-dramatically-increases-the-rate-of-bilayer-flipping
#8
Reid C Van Lehn, Alfredo Alexander-Katz
The cell membrane is a barrier to the passive diffusion of charged molecules due to the chemical properties of the lipid bilayer. Surprisingly, recent experiments have identified processes in which synthetic and biological charged species directly transfer across lipid bilayers on biologically relevant time scales. In particular, amphiphilic nanoparticles have been shown to insert into lipid bilayers, requiring the transport of charged species across the bilayer. The molecular factors facilitating this rapid insertion process remain unknown...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386595/synthesis-and-characterization-of-the-actinium-aquo-ion
#9
Maryline G Ferrier, Benjamin W Stein, Enrique R Batista, John M Berg, Eva R Birnbaum, Jonathan W Engle, Kevin D John, Stosh A Kozimor, Juan S Lezama Pacheco, Lindsay N Redman
Metal aquo ions occupy central roles in all equilibria that define metal complexation in natural environments. These complexes are used to establish thermodynamic metrics (i.e., stability constants) for predicting metal binding, which are essential for defining critical parameters associated with aqueous speciation, metal chelation, in vivo transport, and so on. As such, establishing the fundamental chemistry of the actinium(III) aquo ion (Ac-aquo ion, Ac(H2O) x(3+)) is critical for current efforts to develop (225)Ac [t1/2 = 10...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386594/nanotechnology-driven-therapeutic-interventions-in-wound-healing-potential-uses-and-applications
#10
REVIEW
Suzana Hamdan, Irena Pastar, Stefan Drakulich, Emre Dikici, Marjana Tomic-Canic, Sapna Deo, Sylvia Daunert
The chronic nature and associated complications of nonhealing wounds have led to the emergence of nanotechnology-based therapies that aim at facilitating the healing process and ultimately repairing the injured tissue. A number of engineered nanotechnologies have been proposed demonstrating unique properties and multiple functions that address specific problems associated with wound repair mechanisms. In this outlook, we highlight the most recently developed nanotechnology-based therapeutic agents and assess the viability and efficacy of each treatment, with emphasis on chronic cutaneous wounds...
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386593/setting-cyclohexane-stereochemistry-with-oxidation
#11
Fei Wang, Guosheng Liu
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386592/from-microsolvation-to-cell-permeation-novel-separation-science-for-drug-discovery
#12
Perdita Barran
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386591/slow-release-nanofertilizers-for-bumper-crops
#13
Manish Chhowalla
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386590/the-actinium-aqua-ion-a-century-in-the-making
#14
Laura M Thierer, Neil C Tomson
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386589/hungering-for-obesity-treatments
#15
Jyoti Madhusoodanan
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386588/a-conversation-with-manu-prakash
#16
Melissa Pandika
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28386587/the-ecstasy-and-agony-of-assay-interference-compounds
#17
EDITORIAL
Courtney Aldrich, Carolyn Bertozzi, Gunda I Georg, Laura Kiessling, Craig Lindsley, Dennis Liotta, Kenneth M Merz, Alanna Schepartz, Shaomeng Wang
No abstract text is available yet for this article.
March 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28280781/a-conversation-with-margaret-faul
#18
Prachi Patel
No abstract text is available yet for this article.
February 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28280780/core-shell-nanoparticle-coating-as-an-interfacial-layer-for-dendrite-free-lithium-metal-anodes
#19
Wei Liu, Weiyang Li, Denys Zhuo, Guangyuan Zheng, Zhenda Lu, Kai Liu, Yi Cui
Lithium metal based batteries represent a major challenge and opportunity in enabling a variety of devices requiring high-energy-density storage. However, dendritic lithium growth has limited the practical application of lithium metal anodes. Here we report a nanoporous, flexible and electrochemically stable coating of silica@poly(methyl methacrylate) (SiO2@PMMA) core-shell nanospheres as an interfacial layer on lithium metal anode. This interfacial layer is capable of inhibiting Li dendrite growth while sustaining ionic flux through it, which is attributed to the nanoscaled pores formed among the nanospheres...
February 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28280779/living-additive-manufacturing-transformation-of-parent-gels-into-diversely-functionalized-daughter-gels-made-possible-by-visible-light-photoredox-catalysis
#20
Mao Chen, Yuwei Gu, Awaneesh Singh, Mingjiang Zhong, Alex M Jordan, Santidan Biswas, LaShanda T J Korley, Anna C Balazs, Jeremiah A Johnson
Light-initiated additive manufacturing techniques typically rely on layer-by-layer addition or continuous extraction of polymers formed via nonliving, free radical polymerization methods that render the final materials "dead" toward further monomer insertion; the polymer chains within the materials cannot be reactivated to induce chain extension. An alternative "living additive manufacturing" strategy would involve the use of photocontrolled living radical polymerization to spatiotemporally insert monomers into dormant "parent" materials to generate more complex and diversely functionalized "daughter" materials...
February 22, 2017: ACS Central Science
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