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https://www.readbyqxmd.com/read/28636143/tetratricopeptide-repeat-protein-pyg7-is-essential-for-photosystem-i-assembly-by-interacting-with-psac-in-arabidopsis
#1
Huixia Yang, Pin Li, Aihong Zhang, Xiaogang Wen, Lixin Zhang, Congming Lu
Although progress has been made in determining the structure and understanding the function of photosystem I (PSI), the PSI assembly process remains poorly understood. PsaC is an essential subunit of PSI and participates in the transfer of electrons to ferredoxin. However, how PsaC is assembled during accumulation of the PSI complex is unknown. In the present study, we showed that Pyg7 localized to the stromal thylakoid and associated with the PSI complex. We also showed that Pyg7 interacted with PsaC. Furthermore, we found that the PSI assembly process was blocked following formation of the PsaAB heterodimer in the pyg7 mutant...
June 21, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28634178/ascorbate-protects-the-di-heme-enzyme-maug-against-self-inflicted-oxidative-damage-by-an-unusual-antioxidant-mechanism
#2
Zhongxin Ma, Victor L Davidson
Ascorbate protects MauG from self-inactivation that occurs during the autoreduction of the reactive bis -Fe(IV) state of its diheme cofactor. The mechanism of protection does not involve direct reaction with reactive oxygen species in solution. Instead it binds to MauG and mitigates oxidative damage that occurs via internal transfer of electrons from amino acid residues within the protein to the high-valent hemes. The presence of ascorbate does not inhibit the natural catalytic reaction of MauG which catalyzes oxidative posttranslational modifications of a substrate protein that binds to the surface of MauG, and is oxidized by the high-valent hemes via long range electron transfer...
June 20, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28633407/exploring-fungus-plant-n-transfer-in-a-tripartite-ant-plant-fungus-mutualism
#3
Céline Leroy, Alain Jauneau, Yves Martinez, Armelle Cabin-Flaman, David Gibouin, Jérôme Orivel, Nathalie Séjalon-Delmas
Background and Aims: The plant Hirtella physophora , the ant Allomerus decemarticulatus and a fungus, Trimmatostroma sp., form a tripartite association. The ants manipulate both the plant trichomes and the fungus to build galleries under the stems of their host plant used to capture prey. In addition to its structural role, the fungus also improves nutrient uptake by the host plant. But it still remains unclear whether the fungus plays an indirect or a direct role in transferring nutrients to the plant...
June 13, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28633196/tight-junction-strand-formation-by-claudin-10-isoforms-and-claudin-10a-10b-chimeras
#4
Susanne Milatz, Jörg Piontek, Caroline Hempel, Luca Meoli, Christoph Grohe, Anja Fromm, In-Fah M Lee, Rukeia El-Athman, Dorothee Günzel
Claudins are integral components of tight junctions (TJs) in epithelia and endothelia. When expressed in cell lines devoid of TJs, claudins are able to form TJ-like strands at contacts between adjacent cells. According to a current model of TJ strand formation, claudin protomers assemble in an antiparallel double row within the plasma membrane of each cell (cis-interaction) while binding to corresponding double rows from the neighboring cells (trans-interaction). Cis-interaction was proposed to involve two interfaces of the protomers' first extracellular segment (extracellular loop (ECL)1)...
June 20, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28633187/-development-and-validation-of-a-fully-automated-experimental-set-up-for-ex-vivo-burst-pressure-testing-after-surgical-vessel-closure
#5
Herbert Wallimann, Pia Menges, Bernard Hausen, Albert Linder
Background A growing number of operations are performed using minimally invasive techniques. Therefore, a lot of new requirements must be met by the staplers currently available. At the present time, the most widely used methods of minimally invasive vascular occlusion involve high-frequency energy, clips, and staplers. The most important quality parameter is burst pressure, which is measured with a variety of experimental set-ups, all of which are subject to criticism. With this study, we want to introduce a fully automated vascular burst pressure measuring system that largely mimics physiological conditions...
June 20, 2017: Zentralblatt Für Chirurgie
https://www.readbyqxmd.com/read/28632392/lewis-acid-promoted-hydrogenation-of-co2-and-hcoo-by-amine-boranes-mechanistic-insight-from-computational-approach
#6
Lisa Roy, Boyli Ghosh, Ankan Paul
We employ quantum chemical calculations to study the hydrogenation of carbon dioxide by amine-boranes, NMe3BH3 ((Me3)AB) and NH3BH3 (AB) weakly bonded to a bulkier Lewis acid, Al(C6F5)3 (LA). Additionally, computations has also been conducted to elucidate the mechanism of hydrogenation of carbon dioxide by (Me3)AB while captured between one Lewis Base (P(o-tol3), (LB)) and two Lewis acids, Al(C6F5)3. In agreement to the experiments, our computational study predicts that hydride transfer to conjugated HCO2(‒), generated in the reaction of (Me3)AB-LA with CO2, is not feasible...
June 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28632271/copper-promoted-direct-c-h-alkoxylation-of-s-s-functionalized-internal-olefins-with-alcohols
#7
Zhuqing Liu, Fei Huang, Jiang Lou, Quannan Wang, Zhengkun Yu
Copper-promoted direct C-H alkoxylation of S,S-functionalized internal olefins, that is, α-oxo ketene dithioacetals, was efficiently achieved with alcohols as the alkoxylating agents, (diacetoxyiodo)benzene (PhI(OAc)2) as the oxidant, and benzoquinone (BQ) as the co-oxidant. The alkoxylated olefins were thus constructed and applied for the synthesis of alkoxylated N-heterocycles. The polarization of the olefinic carbon-carbon double bond by the electron-donating dialkylthio and electron-withdrawing α-oxo functionalities plays a crucial role in making such C-H alkoxylation reactions to occur under mild conditions...
June 20, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28631889/microrna-containing-extracellular-vesicles-released-from-endothelial-colony-forming-cells-modulate-angiogenesis-during-ischaemic-retinopathy
#8
Margaret Dellett, Eoin D Brown, Jasenka Guduric-Fuchs, Anna O'Connor, Alan W Stitt, Reinhold J Medina, David A Simpson
Endothelial colony-forming cells (ECFCs) are a defined subtype of endothelial progenitors that modulate vascular repair and promote perfusion in ischaemic tissues. Their paracrine activity on resident vasculature is ill-defined, but mediated, at least in part, by the transfer of extracellular vesicles (EVs). To evaluate the potential of isolated EVs to provide an alternative to cell-based therapies, we first performed a physical and molecular characterization of those released by ECFCs. Their effects upon endothelial cells in vitro and angiogenesis in vivo in a model of proliferative retinopathy were assessed...
June 20, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28631477/influence-of-the-electrostatic-interaction-between-molecular-catalyst-and-semiconductor-on-photocatalytic-hydrogen-evolution-activities-in-cobaloxime-cds-hybrid-systems
#9
Yuxing Xu, Ruotian Chen, Zhen Li, Ai-Long Li, Hongxian Han, Can Li
The influence of the electrostatic interaction on photocatalytic H2 evolution activities in cobaloxime/CdS hybrid systems was studied by measuring the charges of cobaloximes and zeta potentials of CdS at different pH conditions (pH 4~7). The cobaloxime/CdS hybrid systems may serve as a valid model for the investigation of the electrostatic interaction between molecular and semiconductor, because the kinetics of methanol oxidation and the driving force of electron transfer from photo-irradiated CdS to cobaloximes have little effect on the pH dependent photocatalytic H2 evolution activities...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631384/nmr-study-of-the-reductive-decomposition-of-bmim-ntf2-at-gold-electrodes-and-indirect-electrochemical-conversion-of-co2
#10
Roman Michez, Thomas Doneux, Claudine Buess-Herman, Michel Luhmer
Potential controlled electrolyses of [BMIm][NTf2 ] ionic liquid were performed at a gold cathode under nitrogen atmosphere. The structures of the major conversion products of the BMIm(+) cation were elucidated on the basis of 1D and 2D nuclear magnetic resonance (NMR) analyses and gas chromatography (GC) analysis of the volatile compounds. Recombination of the imidazol-2-yl radicals, generated at the electrode by single electron transfer, leads to neutral diastereomeric dimers in equal proportions, with a faradaic efficiency of 80 %, while disproportionation of these radicals and/or reaction with hydrogen atoms adsorbed at the electrode generates a neutral monomer with 20 % faradaic efficiency...
June 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28631290/a-h2-oxidizing-1-2-3-trichlorobenzene-reducing-multienzyme-complex-isolated-from-the-obligately-organohalide-respiring-bacterium-dehalococcoides-mccartyi-strain-cbdb1
#11
Stefanie Hartwig, Nadya Dragomirova, Anja Kublik, Dominique Türkowsky, Martin von Bergen, Ute Lechner, Lorenz Adrian, R Gary Sawers
Dehalococcoides mccartyi is a small, slow-growing bacterium of the phylum Chloroflexi that conserves energy using aliphatic and aromatic organohalides as electron acceptors, and hydrogen as sole electron donor. A recent study identified a protein complex in the membrane of strain CBDB1 comprising a Hup hydrogenase, a complex iron-sulphur molybdoprotein and a reductive dehalogenase (RdhA) that catalyses reduction of 1,2,3,4-tetrachlorobenzene. Using a combination of size-exclusion chromatography, in-gel hydrogenase activity-staining, immunological analysis and mass spectrometry, we identified here a large molecular mass protein complex solubilized from the cytoplasmic membrane of D...
June 19, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28630931/morphology-controls-the-thermoelectric-power-factor-of-a-doped-semiconducting-polymer
#12
Shrayesh N Patel, Anne M Glaudell, Kelly A Peterson, Elayne M Thomas, Kathryn A O'Hara, Eunhee Lim, Michael L Chabinyc
The electrical performance of doped semiconducting polymers is strongly governed by processing methods and underlying thin-film microstructure. We report on the influence of different doping methods (solution versus vapor) on the thermoelectric power factor (PF) of PBTTT molecularly p-doped with F n TCNQ (n = 2 or 4). The vapor-doped films have more than two orders of magnitude higher electronic conductivity (σ) relative to solution-doped films. On the basis of resonant soft x-ray scattering, vapor-doped samples are shown to have a large orientational correlation length (OCL) (that is, length scale of aligned backbones) that correlates to a high apparent charge carrier mobility (μ)...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630929/splitting-of-the-o-o-bond-at-the-heme-copper-catalytic-site-of-respiratory-oxidases
#13
Federica Poiana, Christoph von Ballmoos, Nathalie Gonska, Margareta R A Blomberg, Pia Ädelroth, Peter Brzezinski
Heme-copper oxidases catalyze the four-electron reduction of O2 to H2O at a catalytic site that is composed of a heme group, a copper ion (CuB), and a tyrosine residue. Results from earlier experimental studies have shown that the O-O bond is cleaved simultaneously with electron transfer from a low-spin heme (heme a/b), forming a ferryl state (PR ; Fe(4+)=O(2-), CuB(2+)-OH(-)). We show that with the Thermus thermophilus ba3 oxidase, at low temperature (10°C, pH 7), electron transfer from the low-spin heme b to the catalytic site is faster by a factor of ~10 (τ ≅ 11 μs) than the formation of the PR ferryl (τ ≅110 μs), which indicates that O2 is reduced before the splitting of the O-O bond...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630924/capturing-the-radical-ion-pair-intermediate-in-dna-guanine-oxidation
#14
Jialong Jie, Kunhui Liu, Lidan Wu, Hongmei Zhao, Di Song, Hongmei Su
Although the radical ion pair has been frequently invoked as a key intermediate in DNA oxidative damage reactions and photoinduced electron transfer processes, the unambiguous detection and characterization of this species remain formidable and unresolved due to its extremely unstable nature and low concentration. We use the strategy that, at cryogenic temperatures, the transient species could be sufficiently stabilized to be detectable spectroscopically. By coupling the two techniques (the cryogenic stabilization and the time-resolved laser flash photolysis spectroscopy) together, we are able to capture the ion-pair transient G(+•)⋯Cl(-) in the chlorine radical-initiated DNA guanine (G) oxidation reaction, and provide direct evidence to ascertain the intricate type of addition/charge separation mechanism underlying guanine oxidation...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630339/ucp1-deficiency-causes-brown-fat-respiratory-chain-depletion-and-sensitizes-mitochondria-to-calcium-overload-induced-dysfunction
#15
Lawrence Kazak, Edward T Chouchani, Irina G Stavrovskaya, Gina Z Lu, Mark P Jedrychowski, Daniel F Egan, Manju Kumari, Xingxing Kong, Brian K Erickson, John Szpyt, Evan D Rosen, Michael P Murphy, Bruce S Kristal, Steven P Gygi, Bruce M Spiegelman
Brown adipose tissue (BAT) mitochondria exhibit high oxidative capacity and abundant expression of both electron transport chain components and uncoupling protein 1 (UCP1). UCP1 dissipates the mitochondrial proton motive force (Δp) generated by the respiratory chain and increases thermogenesis. Here we find that in mice genetically lacking UCP1, cold-induced activation of metabolism triggers innate immune signaling and markers of cell death in BAT. Moreover, global proteomic analysis reveals that this cascade induced by UCP1 deletion is associated with a dramatic reduction in electron transport chain abundance...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630037/a-mobile-app-for-the-self-management-of-type-1-diabetes-among-adolescents-a-randomized-controlled-trial
#16
Shivani Goyal, Caitlin A Nunn, Michael Rotondi, Amy B Couperthwaite, Sally Reiser, Angelo Simone, Debra K Katzman, Joseph A Cafazzo, Mark R Palmert
BACKGROUND: While optimal blood glucose control is known to reduce the long-term complications associated with type 1 diabetes mellitus, adolescents often struggle to achieve their blood glucose targets. However, their strong propensity toward technology presents a unique opportunity for the delivery of novel self-management interventions. To support type 1 diabetes self-management in this population, we developed the diabetes self-management app bant, which included wireless blood glucose reading transfer, out-of-range blood glucose trend alerts, coaching around out-of-range trend causes and fixes, and a point-based incentive system...
June 19, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28629500/imhoffiella-gen-nov-a-marine-phototrophic-member-of-the-family-chromatiaceae-including-the-description-of-imhoffiella-purpurea-sp-nov-and-the-reclassification-of-thiorhodococcus-bheemlicus-anil-kumar-et-al-2007-as-imhoffiella-bheemlica-comb-nov
#17
Nupur Nupur, Mohit Kumar Saini, Pradeep Kumar Singh, Suresh Korpole, Naga Radha Srinivas Tanuku, Shinichi Takaichi, Anil Kumar Pinnaka
A coccoid-shaped phototrophic purple sulfur bacterium, strain AK35T, was isolated from a coastal surface water sample collected from Visakhapatnam, India. Cells were Gram-stain-negative, motile and purple, containing bacteriochlorophyll a and the carotenoid rhodopinal as major photosynthetic pigments. Strain AK35T was able to grow photoheterotrophically and could utilize a number of organic substrates. It was unable to grow photoautotrophically. Strain AK35T was able to utilize sulfide and thiosulfate as electron donors...
June 20, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28629098/carbon-nanotube-ensembled-hybrid-nanocomposite-electrode-for-direct-electrochemical-detection-of-epinephrine-in-pharmaceutical-tablets-and-urine
#18
K Koteshwara Reddy, M Satyanarayana, K Yugender Goud, K Vengatajalabathy Gobi, Hern Kim
An efficient electrochemical sensor for selective detection of the neurotransmitter, epinephrine (Epn), has been fabricated with the aid of a functionalized multiwall carbon nanotube-chitosan biopolymer nanocomposite (Chit-fCNT) electrode. Multiwall carbon nanotubes (CNT) were successfully functionalized with the aid of nitric acid and confirmed by the Raman spectral data. Functionalized carbon nanotubes (fCNT) were dispersed in chitosan solution and the resulting bio-nanocomposite was used for the fabrication of sensor surface by drop and cast method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629075/fabrication-of-chitosan-au-tio2-nanotube-based-dry-electrodes-for-electroencephalography-recording
#19
Yanjuan Song, Penghai Li, Mingji Li, Hongji Li, Cuiping Li, Dazhi Sun, Baohe Yang
In this paper, we describe a method for fabricating dry electrodes for use in recording electroencephalograms (EEGs), which are based on the use of chitosan (Ch), gold (Au) particles, and titanium dioxide (TiO2) nanotube arrays deposited on titanium (Ti) thin sheets. The samples were characterized by scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and EEG signal collection. The TiO2 nanotube arrays were grown on the Ti thin sheet by an electrochemical anodic oxidation method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629026/multistate-proteinous-biomemory-device-based-on-redox-controllable-hapten-cross-linker
#20
Remziye Güzel, Arzu Ersöz, İbrahim Dolak, Rıdvan Say
A multistate biomemory device consisting of cytochrome c (Cyt-c) photosensitively cross-linked by MACys-Ru(bipyr)2-MACys hapten molecules, which have memory effect through a charge transfer mechanism, has been developed. In this study, it has suggested a highly resolute surface-confined switch composed a signal-enhanced electro-active protein (Cyt-c) co-polymerized on the gold substrates that can be controlled by redox property through Ruthenium based cysteine monomer hapten, MACys-Ru(bipyr)2-MACys as an ANADOLUCA photosensitive cross-linker...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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