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https://www.readbyqxmd.com/read/29458124/tryptophan-mediated-dimerization-of-the-tssl-transmembrane-anchor-is-required-for-type-vi-secretion-system-activity
#1
Abdelrahim Zoued, Jean-Pierre Duneau, Eric Durand, Alexandre P España, Laure Journet, Françoise Guerlesquin, Eric Cascales
The Type VI secretion system (T6SS) is a multiprotein complex used by bacteria to deliver effectors into target cells. The T6SS comprises a bacteriophage-like contractile tail structure anchored to the cell envelope by a membrane complex constituted of the TssJ outer membrane lipoprotein and the TssL and TssM inner membrane proteins. TssJ establishes contact with the periplasmic domain of TssM whereas the transmembrane segments of TssM and its cytoplasmic domain interact with TssL. TssL protrudes in the cytoplasm but is anchored by a C-terminal transmembrane helix (TMH)...
February 16, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29458110/investigation-of-adhesive-interactions-in-the-specific-targeting-of-triptorelin-conjugated-peg-coated-magnetite-nanoparticles-to-breast-cancer-cells
#2
Jingjie Hu, Sina Youssefian, John Obayemi, Karen Malatesta, Nima Rahbar, Winston Soboyejo
The understanding of adhesive interaction at the nanoscale between functionalized nanoparticles and biological cells is of great importance to develop effective theranostic nanocarriers for targeted cancer therapy. Here, we report a combination of experimental and computational approaches to evaluate the adhesion between Triptorelin (a Luteinizing Hormone-Releasing Hormone (LHRH) agonist)-conjugated poly-(ethylene glycol) (PEG)-coated magnetite nanoparticles (Triptorelin-MNPs) and breast cells. The adhesion forces between Triptorelin-MNPs and normal/cancerous breast cells are obtained using atomic force microscopy...
February 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29458089/structural-and-biophysical-insight-into-dual-site-binding-of-the-protoberberine-alkaloid-palmatine-to-parallel-g-quadruplex-dna-using-nmr-fluorescence-and-circular-dichroism-spectroscopy
#3
Kumar Padmapriya, Ritu Barthwal
Plant derived small molecules, which interact with and stabilize G-quadruplex DNA, act as inhibitors of telomere elongation and oncogene expression in humans. The inhibition of telomerase enzyme has immense potential since it is over expressed in most cancer cells. Interaction of palmatine, an antitumor alkaloid, to parallel G-quadruplex DNA, [d(TTGGGGT)]4 and [d(TTAGGGT)]4 , has been investigated using Nuclear Magnetic Resonance (NMR), fluorescence and Circular Dichroism (CD) spectroscopy. Titrations were monitored by1 H and31 P NMR spectra and solution structure of palmatine-[d(TTGGGGT)]4 complex was obtained by restrained Molecular Dynamics (rMD) simulations using distance restraints from 2D NOESY spectra...
February 16, 2018: Biochimie
https://www.readbyqxmd.com/read/29457371/validation-of-a-blood-marker-for-plasma-volume-in-endurance-athletes-during-a-live-high-train-low-altitude-training-camp
#4
Louisa M Lobigs, Laura A Garvican-Lewis, Victor L Vuong, Nicolin Tee, Christopher J Gore, Peter Peeling, Brian Dawson, Yorck O Schumacher
Altitude is a confounding factor within the Athlete's Biological Passport (ABP) due, in part, to the plasma volume (PV) response to hypoxia. Here, a newly developed PV blood test is applied to assess the possible efficacy of reducing the influence of PV on the volumetric ABP markers; hemoglobin concentration ([Hb]) and the OFF-score. Endurance athletes (n=34) completed a 21 night simulated live high: train low protocol (14h.d-1 at 3000m). Bloods were collected twice pre-altitude, at days 3, 8 and 15 at altitude and 1, 7, 21 and 42 days post-altitude...
February 19, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29457313/modeling-the-hematocrit-distribution-in-microcirculatory-networks-a-quantitative-evaluation-of-a-phase-separation-model
#5
Peter M Rasmussen, Timothy W Secomb, Axel R Pries
OBJECTIVE: Theoretical models are essential tools for studying microcirculatory function. Recently, the validity of a well-established phase separation model was questioned and it was claimed that it produces problematically low hematocrit predictions and lack of red cells in small diameter vessels. We conducted a quantitative evaluation of this phase separation model to establish common ground for future research. METHODS: Model predictions were validated against a comprehensive data base with measurements from four mesenteric networks...
February 19, 2018: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29457163/probing-energy-losses-from-dye-desorption-in-cobalt-complex-based-dye-sensitized-solar-cells
#6
Yan Zhang, Yungen Wu, Zhe Sun, Yanan Kang, Tianyang Chen, Hui Wang, Mao Liang, Song Xue
Self-assembly of organic sensitizer layers in cobalt complex-based DSCs was studied to elucidate its role in reducing the loss of charge recombination. DSCs with various dye loadings were fabricated by dye desorption without the aid of basic solvent. The FT-IR and UV results indicate the deprotonation of the anchoring organic sensitizers, which influences the conduction band of TiO2 remarkably by changing the surface potential. Positive band edge shifts and a decrease of the recombination rate constant are demonstrated to be the main factors affecting energy loss at open circuit...
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29456858/enhanced-biostability-and-cellular-uptake-of-zinc-oxide-nanocrystals-shielded-with-a-phospholipid-bilayer
#7
B Dumontel, M Canta, H Engelke, A Chiodoni, L Racca, A Ancona, T Limongi, G Canavese, V Cauda
The widespread use of ZnO nanomaterials for biomedical applications, including therapeutic drug delivery or stimuli-responsive activation, as well as imaging, imposes a careful control over the colloidal stability and long-term behaviour of ZnO in biological media. Moreover, the effect of ZnO nanostructures on living cells, in particular cancer cells, is still under debate. This paper discusses the role of surface chemistry and charge of zinc oxide nanocrystals, of around 15 nm in size, which influence their behaviour in biological fluids and effect on cancer cells...
November 28, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/29456831/early-afterdepolarisation-tendency-as-a-simulated-pro-arrhythmic-risk-indicator
#8
Beth McMillan, David J Gavaghan, Gary R Mirams
Drug-induced Torsades de Pointes (TdP) arrhythmia is of major interest in predictive toxicology. Drugs which cause TdP block the hERG cardiac potassium channel. However, not all drugs that block hERG cause TdP. As such, further understanding of the mechanistic route to TdP is needed. Early afterdepolarisations (EADs) are a cell-level phenomenon in which the membrane of a cardiac cell depolarises a second time before repolarisation, and EADs are seen in hearts during TdP. Therefore, we propose a method of predicting TdP using induced EADs combined with multiple ion channel block in simulations using biophysically-based mathematical models of human ventricular cell electrophysiology...
November 1, 2017: Toxicology Research
https://www.readbyqxmd.com/read/29456555/a-bootstrap-based-measure-robust-to-the-choice-of-normalization-methods-for-detecting-rhythmic-features-in-high-dimensional-data
#9
Yolanda Larriba, Cristina Rueda, Miguel A Fernández, Shyamal D Peddada
Motivation: Gene-expression data obtained from high throughput technologies are subject to various sources of noise and accordingly the raw data are pre-processed before formally analyzed. Normalization of the data is a key pre-processing step, since it removes systematic variations across arrays. There are numerous normalization methods available in the literature. Based on our experience, in the context of oscillatory systems, such as cell-cycle, circadian clock, etc., the choice of the normalization method may substantially impact the determination of a gene to be rhythmic...
2018: Frontiers in Genetics
https://www.readbyqxmd.com/read/29456508/the-molecular-determinants-of-small-molecule-ligand-binding-at-p2x-receptors
#10
Gaia Pasqualetto, Andrea Brancale, Mark T Young
P2X receptors are trimeric eukaryotic ATP-gated cation channels. Extracellular ATP-their physiological ligand-is released as a neurotransmitter and in conditions of cell damage such as inflammation, and substantial evidence implicates P2X receptors in diseases including neuropathic pain, cancer, and arthritis. In 2009, the first P2X crystal structure, Danio rerio P2X4 in the apo - state, was published, and this was followed in 2012 by the ATP-bound structure. These structures transformed our understanding of the conformational changes induced by ATP binding and the mechanism of ligand specificity, and enabled homology modeling of mammalian P2X receptors for ligand docking and rational design of receptor modulators...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29456279/uncertainty-footprint-visualization-of-nonuniform-behavior-of-iterative-algorithms-applied-to-4d-cell-tracking
#11
Y Wan, C Hansen
Research on microscopy data from developing biological samples usually requires tracking individual cells over time. When cells are three-dimensionally and densely packed in a time-dependent scan of volumes, tracking results can become unreliable and uncertain. Not only are cell segmentation results often inaccurate to start with, but it also lacks a simple method to evaluate the tracking outcome. Previous cell tracking methods have been validated against benchmark data from real scans or artificial data, whose ground truth results are established by manual work or simulation...
June 2017: Computer Graphics Forum: Journal of the European Association for Computer Graphics
https://www.readbyqxmd.com/read/29456262/mixed-analytical-stochastic-simulation-method-for-the-recovery-of-a-brownian-gradient-source-from-probability-fluxes-to-small-windows
#12
U Dobramysl, D Holcman
Is it possible to recover the position of a source from the steady-state fluxes of Brownian particles to small absorbing windows located on the boundary of a domain? To address this question, we develop a numerical procedure to avoid tracking Brownian trajectories in the entire infinite space. Instead, we generate particles near the absorbing windows, computed from the analytical expression of the exit probability. When the Brownian particles are generated by a steady-state gradient at a single point, we compute asymptotically the fluxes to small absorbing holes distributed on the boundary of half-space and on a disk in two dimensions, which agree with stochastic simulations...
February 15, 2018: Journal of Computational Physics
https://www.readbyqxmd.com/read/29456044/mesoporous-silica-nanoparticles-functionalized-with-hyaluronic-acid-effect-of-the-biopolymer-chain-length-on-cell-internalization
#13
Valentina Nairi, Silvia Magnolia, Marco Piludu, Mariella Nieddu, Cristian Antonio Caria, Valeria Sogos, Maria Vallet-Regì, Maura Monduzzi, Andrea Salis
Mesoporous silica nanoparticles (MSNs) were functionalized with amino groups (MSN-NH2 ) and then with hyaluronic acid, a biocompatible biopolymer which can be recognized by CD44 receptors in tumor cells, to obtain a targeting drug delivery system. To this purpose, three hyaluronic acid samples differing for the molecular weight, namely HAS (8-15 kDa), HAM (30-50 kDa) and HAL (90-130 kDa), were used. The MSN-HAS , MSN-HAM , and MSN-HAL materials were characterized through zeta potential and dynamic light scattering measurements at pH = 7...
February 12, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29455637/molecular-dynamics-of-interaction-of-sesamin-and-related-compounds-with-the-cancer-marker-%C3%AE-catenin-an-in-silico-study
#14
Bindu Madhuri Cavuturu, Vishwambar Vishnu Bhandare, Amutha Ramaswamy, Neelakantan Arumugam
By virtue of their regulatory role in the biological process, certain protein-protein complexes form potential targets for designing and discovery of drugs. Alteration set in the controlled formation of such complexes results in dysregulation of several metabolic processes, leading to diseased condition. β-catenin/Tcf4 complex is one such protein-protein complex found altered in colorectal epithelial cells resulting in activation of target genes leading to cancer. Recently certain lignans from seeds of the oil crop sesame were found inhibiting initiation and progression of this type of cancer...
February 18, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29455286/prediction-of-biotransformation-products-of-the-fungicide-fluopyram-by-electrochemistry-coupled-online-to-liquid-chromatography-mass-spectrometry-and-comparison-with-in-vitro-microsomal-assays
#15
Tessema F Mekonnen, Ulrich Panne, Matthias Koch
Biotransformation processes of fluopyram (FLP), a new succinate dehydrogenase inhibitor (SDHI) fungicide, were investigated by electrochemistry (EC) coupled online to liquid chromatography (LC) and electrospray mass spectrometry (ESI-MS). Oxidative phase I metabolite production was achieved using an electrochemical flow-through cell equipped with a boron-doped diamond (BDD) electrode. Structural elucidation and prediction of oxidative metabolism pathways were assured by retention time, isotopic patterns, fragmentation, and accurate mass measurements using EC/LC/MS, LC-MS/MS, and/or high-resolution mass spectrometry (HRMS)...
February 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29455026/an-approach-for-cell-viability-online-detection-based-on-the-characteristics-of-lensfree-cell-diffraction-fingerprint
#16
Guoxiao Li, Rongbiao Zhang, Ning Yang, Changsheng Yin, Mingji Wei, Yecheng Zhang, Jian Sun
To overcome the drawbacks such as low automation and high cost, an approach for cell viability online detection is proposed, based on the extracted lensfree cell diffraction fingerprint characteristics. The cell fingerprints are acquired by a constructed large field-of-view (FOV) diffraction imaging platform without any lenses. The approach realizes distinguishing live and dead cells online and calculating cell viability index based on the number of live cells. With theoretical analysis and simulation, diffraction fingerprints of cells with different morphology are simulated and two characteristics are discovered to be able to reflect cell viability status effectively...
February 7, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29455001/evolution-and-molecular-mechanism-of-pitas-in-iron-transport-of-streptococcus-species
#17
Kun Cao, Jing Zhang, Xin-Yu Miao, Qiu-Xia Wei, Xin-Lu Zhao, Qing-Yu He, Xuesong Sun
Iron is an essential element for almost all bacteria. The iron ATP-binding cassette (ABC) transporters located on the cell membrane affects bacterial virulence and infection. Although a variety of Fe3+ -transporters have been found in bacteria, their evolutionary processes are rarely studied. Pneumococcal iron ABC transporter (PitA), a highly conserved Fe3+ -transporter in most pathogenic bacteria, influences the capsule formation and virulence of bacteria. However, multiple sequence alignment revealed that PitA is expressed in four different variants in bacteria, and the structural complexity of these variants increases progressively...
February 10, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29454860/velocity-landscape-correlation-resolves-multiple-flowing-protein-populations-from-fluorescence-image-time-series
#18
Elvis Pandžić, Asmahan Abu-Arish, Renee W Whan, John W Hanrahan, Paul W Wiseman
Molecular, vesicular and organellar flows are of fundamental importance for the delivery of nutrients and essential components used in cellular functions such as motility and division. With recent advances in fluorescence/super-resolution microscopy modalities we can resolve the movements of these objects at higher spatio-temporal resolutions and with better sensitivity. Previously, spatio-temporal image correlation spectroscopy has been applied to map molecular flows by correlation analysis of fluorescence fluctuations in image series...
February 15, 2018: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/29454386/telomere-elongation-protects-heart-and-lung-tissue-cells-from-fatal-damage-in-rats-exposed-to-severe-hypoxia
#19
Yaping Wang, Zhen Zhao, Zhiyong Zhu, Pingying Li, Xiaolin Li, Xiaohong Xue, Jie Duo, Yingcai Ma
BACKGROUND: The effects of acute hypoxia at high altitude on the telomere length of the cells in the heart and lung tissues remain unclear. This study aimed to investigate the change in telomere length of rat heart and lung tissue cells in response to acute exposure to severe hypoxia and its role in hypoxia-induced damage to heart and lung tissues. METHODS: Forty male Wistar rats (6-week old) were randomized into control group (n = 10) and hypoxia group (n = 30)...
February 17, 2018: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/29454093/silencing-circular-rna-hsa_circ_0000977-suppresses-pancreatic-ductal-adenocarcinoma-progression-by-stimulating-mir-874-3p-and-inhibiting-plk1-expression
#20
Wen-Jie Huang, Yun-Chao Wang, Song-Song Liu, Jia-Li Yang, Shi-Xiang Guo, Li-Jiang Wang, Huai-Zhi Wang, Ying-Fang Fan
Circular RNAs (CircRNAs) are a novel type of endogenous noncoding RNAs that regulate target gene expression by interacting with microRNA (miRNA). Emerging evidence shows that dysregulation of circRNAs plays important roles in biological and pathological processes, including cancer development and progression. The functional role of circRNA in PDAC (pancreatic ductal adenocarcinoma) remains to be investigated. In this study, high throughput microarray assay revealed that hsa_circ_0000977 was aberrantly up-regulated in pancreatic cancer tissues; this was also validated by qRT-PCR...
February 14, 2018: Cancer Letters
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