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https://www.readbyqxmd.com/read/28433003/the-plastid-outer-membrane-localized-lptd1-is-important-for-glycerolipid-remodeling-under-phosphate-starvation
#1
Yi-Ching Hsueh, Christian Ehmann, Nadine Flinner, Roman Ladig, Enrico Schleiff
Glycerolipid synthesis in plants is coordinated between plastids and the endoplasmic reticulum (ER). A central step within the glycerolipid synthesis is the transport of phosphatidic acid from ER to chloroplasts. The chloroplast outer envelope protein TGD4 belongs to the LptD family conserved in bacteria and plants and selectively binds and may transports phosphatidic acid. We describe a second LptD-family protein in A. thaliana (atLPTD1; At2g44640) characterized by a barrel domain with an amino acid signature typical for cyanobacterial LptDs...
April 22, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28432978/cadmium-hampers-salt-tolerance-of-sesuvium-portulacastrum
#2
Mariem Wali, Soledad Martos, Laura Pérez-Martín, Chedly Abdelly, Tahar Ghnaya, Charlotte Poschenrieder, Benet Gunsé
It is well known that salinity reduces cadmium toxicity in halophytes. However, the possible interference of Cd with the mechanisms of salt tolerance is poorly explored. The aim of this study was to see whether Cd affects salt tolerance mechanisms in the halophyte Sesuvium portulacastrum. S. portulacastrum plants obtained from cuttings were grown in hydroponics for 3 weeks and then exposed to low (0.09 mM) or moderate (200 mM) NaCl concentrations, alone or in combination with 25 μM CdCl2. Microscopy observation revealed two strategies of salt tolerance: euhalophytism and secretion of salt by bladder cells...
April 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28432958/membrane-fusion-between-baculovirus-budded-virus-enveloped-particles-and-giant-liposomes-generated-using-a-droplet-transfer-method-for-the-incorporation-of-recombinant-membrane-proteins
#3
Misako Nishigami, Takaaki Mori, Masahiro Tomita, Kingo Takiguchi, Kanta Tsumoto
Giant proteoliposomes are generally useful as artificial cell membranes in biochemical and biophysical studies, and various procedures for their preparation have been reported. We present here a novel preparation technique that involves the combination of i) cell-sized lipid vesicles (giant unilamellar vesicles, GUVs) that are generated using the droplet-transfer method, where lipid monolayer-coated water-in-oil microemulsion droplets interact with oil/water interfaces to form enclosed bilayer vesicles, and ii) budded viruses (BVs) of baculovirus (Autographa californica nucleopolyhedrovirus) that express recombinant transmembrane proteins on their envelopes...
April 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28432953/new-and-practical-mathematical-model-of-membrane-fouling-in-an-aerobic-submerged-membrane-bioreactor
#4
Mst Fazana Rahman Zuthi, Wenshan Guo, Huu Hao Ngo, Duc Long Nghiem, Faisal I Hai, Siqing Xia, Jianxin Li, Jixiang Li, Yi Liu
This study aimed to develop a practical semi-empirical mathematical model of membrane fouling that accounts for cake formation on the membrane and its pore blocking as the major processes of membrane fouling. In the developed model, the concentration of mixed liquor suspended solid is used as a lumped parameter to describe the formation of cake layer including the biofilm. The new model considers the combined effect of aeration and backwash on the foulants' detachment from the membrane. New exponential coefficients are also included in the model to describe the exponential increase of transmembrane pressure that typically occurs after the initial stage of an MBR operation...
April 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432949/dominance-of-candidate-saccharibacteria-in-a-membrane-bioreactor-treating-medium-age-landfill-leachate-effects-of-organic-load-on-microbial-communities-hydrolytic-potential-and-extracellular-polymeric-substances
#5
Nikolaos Remmas, Paraschos Melidis, Ioanna Zerva, Jon Bent Kristoffersen, Sofia Nikolaki, George Tsiamis, Spyridon Ntougias
A membrane bioreactor (MBR), accomplishing high nitrogen removal efficiencies, was evaluated under various landfill leachate concentrations (50, 75 and 100% v/v). Proteinous and carbohydrate extracellular polymeric substances (EPS) and soluble microbial product (SMP) were strongly correlated (p<0.01) with organic load, salinity and NH4(+)-N. Exceptionally high β-glucosidase activities (6700-10,100Ug(-1)) were determined during MBR operation with 50% v/v leachate, as a result of the low organic carbon availability that extendedly induced β-glucosidases to breakdown the least biodegradable organic fraction...
April 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432921/gates-for-soluble-and-membrane-proteins-and-two-trafficking-systems-ift-and-lift-establish-a-dynamic-ciliary-signaling-compartment
#6
REVIEW
Victor L Jensen, Michel R Leroux
Primary cilia are microtubule-based organelles found on most mammalian cell surfaces. They possess a soluble matrix and membrane contiguous with the cell body cytosol and plasma membrane, and yet, have distinct compositions that can be modulated to enable dynamic signal transduction. Here, we discuss how specialized ciliary compartments are established using a coordinated network of gating, trafficking and targeting activities. Cilium homeostasis is maintained by a size-selective molecular mesh that limits soluble protein entry, and by a membrane diffusion barrier localized at the transition zone...
April 19, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28432886/evaluation-of-biochar-ultrafiltration-membrane-processes-for-humic-acid-removal-under-various-hydrodynamic-ph-ionic-strength-and-pressure-conditions
#7
Vaibhavi Shankar, Jiyong Heo, Yasir A J Al-Hamadani, Chang Min Park, Kyoung Hoon Chu, Yeomin Yoon
The performance of an ultrafiltration (UF)-biochar process was evaluated in comparison with a UF membrane process for the removal of humic acid (HA). Bench-scale UF experiments were conducted to study the rejection and flux trends under various hydrodynamic, pH, ionic strength, and pressure conditions. The resistance-in-series model was used to evaluate the processes and it showed that unlike stirred conditions, where low fouling resistance was observed (28.7 × 10(12) m(-1) to 32.5 × 10(12) m(-1)), higher values and comparable trends were obtained for UF-biochar and UF alone for unstirred conditions (28...
April 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28432785/phosphorylation-of-irhom2-at-the-plasma-membrane-controls-mammalian-tace-dependent-inflammatory-and-growth-factor-signalling
#8
Adam Graham Grieve, Hongmei Xu, Ulrike Künzel, Paul Bambrough, Boris Sieber, Matthew Freeman
Proteolytic cleavage and release from the cell surface of membrane-tethered ligands is an important mechanism of regulating intercellular signalling. TACE is a major shedding protease, responsible for the liberation of the inflammatory cytokine TNFα and ligands of the epidermal growth factor receptor. iRhoms, catalytically inactive members of the rhomboid-like superfamily, have been shown to control the ER-to-Golgi transport and maturation of TACE. Here, we reveal that iRhom2 remains associated with TACE throughout the secretory pathway, and is stabilised at the cell surface by this interaction...
April 22, 2017: ELife
https://www.readbyqxmd.com/read/28432774/comprehensive-two-dimensional-pc-3-prostate-cancer-cell-membrane-chromatography-for-screening-anti-tumor-components-from-radix-sophorae-flavescentis
#9
Qiang Wang, Junnan Xu, Xiang Li, Dawei Zhang, Yong Han, Xu Zhang
Radix Sophorae flavescentis is generally used for the treatments of different stages of prostate cancer in China. It has ideal effects when combined with surgical treatment and chemotherapy. However, its active components are still ambiguous. We devised a comprehensive two-dimensional PC-3 prostate cancer cell membrane chromatography system for screening anti-prostate cancer components in Radix Sophorae flavescentis. Gefitinib and dexamethasone were chosen as positive and negative drugs respectively for validation and optimization the selectivity and suitability of the comprehensive two-dimensional chromatographic system...
April 22, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28432627/inorganic-fouling-control-in-reverse-osmosis-wastewater-reclamation-by-purging-carbon-dioxide
#10
Muhammad Kashif Shahid, Minsu Pyo, Young-Gyun Choi
Inorganic fouling on the membrane surface is one of the major prevalent issues affecting the performance and cost of reverse osmosis system. Chemical dosage is a widely adopted method for the inhibition of inorganic scale on the membrane surface. In this study, CO2 was used to control inorganic scale formation on surface of reverse osmosis (RO) membrane in wastewater reclamation. The pH of influent could be lowered by purging CO2. It caused an increase in solubility of inorganic salts in water resulting in discharge of principle ions in concentrate stream...
April 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28432599/the-beneficial-effect-of-repaglinide-on-in-vitro-maturation-and-development-ability-of-immature-mouse-oocytes
#11
Eshrat Kalehoei, Mehri Azadbakht
Repaglinide is a hypoglycemic drug, causing depolarization of the cell membrane, opening the voltage-gated calcium channels, and then increasing intracellular calcium in the pancreatic B cells by inhibition of the K-ATP-sensitive channels. Oocyte in vitro maturation (IVM) is influenced by different factors such as calcium signaling. In this study, we examined the effects of repaglinide on in vitro maturation and fertilization ability of mouse oocyte. Immature oocytes were isolated from female Naval Medical Research Institute mice which are 6-8 wk old mechanically and then cultured in 30 μl droplets of T6 medium with different concentrations of repaglinide...
April 21, 2017: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/28432486/cholesterol-as-a-modifying-agent-of-the-neurovascular-unit-structure-and-function-under-physiological-and-pathological-conditions
#12
REVIEW
Ewelina Czuba, Aleksandra Steliga, Grażyna Lietzau, Przemysław Kowiański
The brain, demanding constant level of cholesterol, precisely controls its synthesis and homeostasis. The brain cholesterol pool is almost completely separated from the rest of the body by the functional blood-brain barrier (BBB). Only a part of cholesterol pool can be exchanged with the blood circulation in the form of the oxysterol metabolites such, as 27-hydroxycholesterol (27-OHC) and 24S-hydroxycholesterol (24S-OHC). Not only neurons but also blood vessels and neuroglia, constituting neurovascular unit (NVU), are crucial for the brain cholesterol metabolism and undergo precise regulation by numerous modulators, metabolites and signal molecules...
April 21, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28432466/calpain-inhibition-prevents-flotillin-re-ordering-and-src-family-activation-during-capacitation
#13
Deneb Maldonado-García, Monica L Salgado-Lucio, Ana L Roa-Espitia, Tania Reyes-Miguel, Enrique O Hernández-González
Prior to fertilization, mammalian sperm undergo several molecular, biochemical and physiological changes in a process termed capacitation. However, the mechanisms explaining the involvement of cytoskeletal remodeling and membrane re-ordering in each process prior to fertilization remain poorly understood. We found that the migration of both flotillin microdomains and Src family kinases towards the apical ridge of guinea pig sperm occurs under capacitating conditions. This re-ordering is associated with spectrin cleavage by calpain...
April 22, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28432453/the-influence-of-oxo-bridged-binuclear-gold-iii-complexes-on-na-k-atpase-activity-a-joint-experimental-and-theoretical-approach
#14
Aleksandra M Bondžić, Mirjana B Čolović, Goran V Janjić, Božidarka Zarić, Sandra Petrović, Danijela Z Krstić, Tiziano Marzo, Luigi Messori, Vesna M Vasić
The in vitro effects of oxo-bridged binuclear gold(III) complexes, i.e., [(bipy2Me)2Au2(μ-O)2][PF6]2 (Auoxo6), Au2[(bipydmb-H)2(μ-O)][PF6] (Au2bipyC) and [Au2(phen(2Me))2(μ-O)2](PF6)2 (Au2phen) on Na/K-ATPase, purified from the porcine cerebral cortex, were investigated. All three studied gold complexes inhibited the enzyme activity in a concentration-dependent manner achieving IC50 values in the low micromolar range. Kinetic analysis suggested an uncompetitive mode of inhibition for Auoxo6 and Au2bipyC, and a mixed type one for Au2phen...
April 21, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28432405/-extracorporeal-membrane-oxygenation-system-selection-contra-indications-and-management
#15
T Staudinger
There are a large number of extracorporeal membrane oxygenation (ECMO) systems and configurations. Thorough planning and evaluation of specific therapeutic needs are necessary to tailor ECMO therapy to the individual patient situation. Indications tend towards lowering the threshold towards respiratory ECMO. Patients with severe acute respiratory distress syndrome (ARDS) not improving to optimization of ventilation and supportive therapeutic measures potentially qualify for ECMO. Contraindications are relative and have to be considered in the light of the individual risk-benefit ratio...
April 21, 2017: Medizinische Klinik, Intensivmedizin und Notfallmedizin
https://www.readbyqxmd.com/read/28432363/joint-based-description-of-protein-structure-its-application-to-the-geometric-characterization-of-membrane-proteins
#16
Jayaraman Thangappan, Sangwook Wu, Sun-Gu Lee
A macroscopic description of a protein structure allows an understanding of the protein conformations in a more simplistic manner. Here, a new macroscopic approach that utilizes the joints of the protein secondary structures as a basic descriptor for the protein structure is proposed and applied to study the arrangement of secondary structures in helical membrane proteins. Two types of dihedral angle, Ω and λ, were defined based on the joint points of the transmembrane (TM) helices and loops, and employed to analyze 103 non-homologous membrane proteins with 3 to 14 TM helices...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432351/early-measurement-of-il-10-predicts-the-outcomes-of-patients-with-acute-respiratory-distress-syndrome-receiving-extracorporeal-membrane-oxygenation
#17
Chia-Hsiung Liu, Shuenn-Wen Kuo, Wen-Je Ko, Pi-Ru Tsai, Shu-Wei Wu, Chien-Heng Lai, Chih-Hsien Wang, Yih-Sharng Chen, Pei-Lung Chen, Tze-Tze Liu, Shu-Chien Huang, Tzuu-Shuh Jou
Patients diagnosed with acute respiratory distress syndrome are generally severely distressed and associated with high morbidity and mortality despite aggressive treatments such as extracorporeal membrane oxygenation (ECMO) support. To identify potential biomarker of predicting value for appropriate use of this intensive care resource, plasma interleukin-10 along with relevant inflammatory cytokines and immune cell populations were examined during the early and subsequent disease courses of 51 critically ill patients who received ECMO support...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432329/affinity-biosensors-using-recombinant-native-membrane-proteins-displayed-on-exosomes-application-to-botulinum-neurotoxin-b-receptor
#18
Richard Desplantes, Christian Lévêque, Benjamin Muller, Manuela Lotierzo, Géraldine Ferracci, Michel Popoff, Michael Seagar, Robert Mamoun, Oussama El Far
The development of simple molecular assays with membrane protein receptors in a native conformation still represents a challenging task. Exosomes are extracellular vesicles which, due to their stability and small size, are suited for analysis in various assay formats. Here, we describe a novel approach to sort recombinant fully native and functional membrane proteins to exosomes using a targeting peptide. Specific binding of high affinity ligands to the potassium channel Kv1.2, the G-protein coupled receptor CXCR4, and the botulinum neurotoxin type B (BoNT/B) receptor, indicated their correct assembly and outside out orientation in exosomes...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432323/refractive-index-tomograms-and-dynamic-membrane-fluctuations-of-red-blood-cells-from-patients-with-diabetes-mellitus
#19
SangYun Lee, HyunJoo Park, Kyoohyun Kim, YongHak Sohn, Seongsoo Jang, YongKeun Park
In this paper, we present the optical characterisations of diabetic red blood cells (RBCs) in a non-invasive manner employing three-dimensional (3-D) quantitative phase imaging. By measuring 3-D refractive index tomograms and 2-D time-series phase images, the morphological (volume, surface area and sphericity), biochemical (haemoglobin concentration and content) and mechanical (membrane fluctuation) parameters were quantitatively retrieved at the individual cell level. With simultaneous measurements of individual cell properties, systematic correlative analyses on retrieved RBC parameters were also performed...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432301/ampk-signaling-in-the-nucleus-accumbens-core-mediates-cue-induced-reinstatement-of-cocaine-seeking
#20
Xue-Jiao Gao, Kai Yuan, Lu Cao, Wei Yan, Yi-Xiao Luo, Min Jian, Jian-Feng Liu, Qin Fang, Ji-Shi Wang, Ying Han, Jie Shi, Lin Lu
Relapse to drug seeking can be caused by exposure to drug-associated cues, provoking drug craving even after prolonged abstinence. Recent studies demonstrated that AMP-activated protein kinase (AMPK) regulates neuronal morphology and membrane excitability in neurons. Here, we investigated the role of AMPK activity in the nucleus accumbens (NAc) in relapse to cocaine seeking. We found that exposure to drug-related cues reinstated cocaine-seeking behavior and increased AMPK and p70s6k phosphorylation in the NAc core but not shell...
April 21, 2017: Scientific Reports
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