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https://www.readbyqxmd.com/read/28092763/growth-and-antioxidant-defense-responses-of-wheat-seedlings-to-di-n-butyl-phthalate-and-di-2-ethylhexyl-phthalate-stress
#1
Minling Gao, Youming Dong, Ze Zhang, Wenhua Song, Yun Qi
Phthalate acid esters (PAEs) are vital environmental hormone-like chemicals that are noxious to plants, animals, and human beings. In this study, the influences of di-n-butyl phthalate (DBP) and di (2-ethylhexyl) phthalate (DEHP) on the seed germination, root morphology, and various physiological changes of wheat seedlings were investigated by analyzing superoxide anion (O2(-)) accumulation, antioxidant enzyme activity, and lipid peroxidation. DBP and DEHP were found to obviously inhibit germination only at high concentrations, but significantly affected root morphology even at lower concentrations...
January 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28092704/x-ray-reflectivity-study-of-interaction-of-an-imidazolium-based-ionic-liquid-with-soft-supported-lipid-membrane
#2
Gourav Bhattacharya, Rajendra P Giri, Himani Saxena, Ved Varun Agrawal, Ashish Gupta, Mrinmay Kumar Mukhopadhyay, Sajal Kumar Ghosh
Ionic liquids (ILs) are important for their antimicrobial activity and are found to be toxic to some of the micro-organisms. To shed light on the mechanism of their activities, the interaction of an imidazolium-based IL 1-butyl-3-methylimidazolium tetrfluroborate ([BMIM][BF4]) with E-coli bacteria and cell membrane mimicking lipid mono- and bi-layers have been studied. The survival of the bacteria and corresponding growth inhibition are observed to be a function of concentration of the IL. The IL alters the pressure area isotherm of the monolayer formed at air-water interface by the lipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)...
January 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28092439/molecular-details-of-the-ph-domain-of-acap1-bar-ph-protein-binding-to-pip-containing-membrane
#3
Chun Chan, Lanyuan Lu, Fei Sun, Jun Fan
ACAP1 proteins were previously reported to specifically bind PIP2-containing cell membranes and form well-structured protein lattices in order to conduct membrane tubulation. We carried out molecular dynamics simulations to characterize orientation of the PH domains with respect to the BAR domains inside the protein dimer. Followed by molecular dynamics simulations, we present a comprehensive orientation analysis of PH domain under different states including unbound and bound with lipids. We have examined two binding pockets on the PH domain and present PMF profiles of the two pockets to account for their preference to PIP2 lipids...
January 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28092434/3d-probed-lipid-dynamics-in-small-unilamellar-vesicles
#4
Meng-Hsuan Chao, Yen-Ting Lin, Namasivayam Dhenadhayalan, Hsin-Lung Lee, Hsin-Yen Lee, King-Chuen Lin
Single-molecule fluorescence correlation spectroscopy overcomes the resolution barrier of optical microscopy (10≈-20 nm) and is utilized to look into lipid dynamics in small unilamellar vesicles (SUVs; diameter < 100 nm). The fluorescence trajectories of lipid-like tracer 1,1'-dioctadecyl-3,3,3',3'-tetramethylindodicarbocyanine (DiD) in the membrane bilayers are acquired at a single-molecule level. The autocorrelation analysis yields the kinetic information on lipid organization, oxygen transport, and lateral diffusion in SUVs' membrane...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092368/molecular-insights-into-lipid-assisted-ca-2-regulation-of-the-trp-channel-polycystin-2
#5
Martin Wilkes, M Gregor Madej, Lydia Kreuter, Daniel Rhinow, Veronika Heinz, Silvia De Sanctis, Sabine Ruppel, Rebecca M Richter, Friederike Joos, Marina Grieben, Ashley C W Pike, Juha T Huiskonen, Elisabeth P Carpenter, Werner Kühlbrandt, Ralph Witzgall, Christine Ziegler
Polycystin-2 (PC2), a calcium-activated cation TRP channel, is involved in diverse Ca(2+) signaling pathways. Malfunctioning Ca(2+) regulation in PC2 causes autosomal-dominant polycystic kidney disease. Here we report two cryo-EM structures of distinct channel states of full-length human PC2 in complex with lipids and cations. The structures reveal conformational differences in the selectivity filter and in the large exoplasmic domain (TOP domain), which displays differing N-glycosylation. The more open structure has one cation bound below the selectivity filter (single-ion mode, PC2SI), whereas multiple cations are bound along the translocation pathway in the second structure (multi-ion mode, PC2MI)...
January 16, 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28091954/methane-alleviates-copper-induced-seed-germination-inhibition-and-oxidative-stress-in-medicago-sativa
#6
Muhammad Kaleem Samma, Heng Zhou, Weiti Cui, Kaikai Zhu, Jing Zhang, Wenbiao Shen
Recent results discovered the protective roles of methane (CH4) against oxidative stress in animals. However, the possible physiological roles of CH4 in plants are still unknown. By using physiological, histochemical and molecular approaches, the beneficial role of CH4 in germinating alfalfa seeds upon copper (Cu) stress was evaluated. Endogenous production of CH4 was significantly increased in Cu-stressed alfalfa seeds, which was mimicked by 0.39 mM CH4. The pretreatment with CH4 significantly alleviated the inhibition of seed germination and seedling growth induced by Cu stress...
January 13, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28091625/mplex-a-method-for-simultaneous-pathogen-inactivation-and-extraction-of-samples-for-multi-omics-profiling
#7
Kristin E Burnum-Johnson, Jennifer E Kyle, Amie J Eisfeld, Cameron P Casey, Kelly G Stratton, Juan F Gonzalez, Fabien Habyarimana, Nicholas M Negretti, Amy C Sims, Sadhana Chauhan, Larissa B Thackray, Peter J Halfmann, Kevin B Walters, Young-Mo Kim, Erika M Zink, Carrie D Nicora, Karl K Weitz, Bobbie-Jo M Webb-Robertson, Ernesto S Nakayasu, Brian Ahmer, Michael E Konkel, Vladimir Motin, Ralph S Baric, Michael S Diamond, Yoshihiro Kawaoka, Katrina M Waters, Richard D Smith, Thomas O Metz
The continued emergence and spread of infectious agents is of great concern, and systems biology approaches to infectious disease research can advance our understanding of host-pathogen relationships and facilitate the development of new therapies and vaccines. Molecular characterization of infectious samples outside of appropriate biosafety containment can take place only subsequent to pathogen inactivation. Herein, we describe a modified Folch extraction using chloroform/methanol that facilitates the molecular characterization of infectious samples by enabling simultaneous pathogen inactivation and extraction of proteins, metabolites, and lipids for subsequent mass spectrometry-based multi-omics measurements...
January 16, 2017: Analyst
https://www.readbyqxmd.com/read/28091533/atp-binding-cassette-transporter-abca7-regulates-nkt-cell-development-and-function-by-controlling-cd1d-expression-and-lipid-raft-content
#8
Heba N Nowyhed, Shilpi Chandra, William Kiosses, Paola Marcovecchio, Farah Andary, Meng Zhao, Michael L Fitzgerald, Mitchell Kronenberg, Catherine C Hedrick
ABCA7 is an ABC transporter expressed on the plasma membrane, and actively exports phospholipid complexes from the cytoplasmic to the exocytoplasmic leaflet of membranes. Invariant NKT (iNKT) cells are a subpopulation of T lymphocytes that recognize glycolipid antigens in the context of CD1d-mediated antigen presentation. In this study, we demonstrate that ABCA7 regulates the development of NKT cells in a cell-extrinsic manner. We found that in Abca7(-/-) mice there is reduced expression of CD1d accompanied by an alteration in lipid raft content on the plasma membrane of thymocytes and antigen presenting cells...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090279/association-of-atp-binding-cassette-transporter-a1-abca1-565-c-t-gene-polymorphism-with-hypoalphalipoproteinemia-and-serum-lipids-il-6-and-crp-levels
#9
Mohammad Mahdi Babashamsi, Sohrab Halalkhor, Hamid Moradi Firouzjah, Hadi Parsian, Seyed Farzad Jalali, Mohammad Babashamsi
BACKGROUND: ATP-binding cassette transporter A1 (ABCA1) is a membrane integral protein which plays a vital role in High Density Lipoprotein (HDL) metabolism and exerts a protective effect against Hypoalphalipoproteinemia (HA) by mediation of rate-limiting step in HDL biogenesis. In addition, this protein possesses anti-inflammatory effects by inhibiting the production of some inflammatory cytokines in macrophages. This study investigated the association of ABCA1-565 C/T gene polymorphism with HA and serum lipids, IL-6 and CRP levels...
January 2017: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/28089770/structural-pierce-into-molecular-mechanism-underlying-clostridium-perfringens-epsilon-toxin-function
#10
Saeed Khalili, Abolfazl Jahangiri, Zahra Sadat Hashemi, Bahman Khalesi, Meysam Mardsoltani, Jafar Amani
Epsilon toxin of the Clostridium perfringens garnered a lot of attention due to its potential for toxicity in humans, extreme potency for cytotoxicity in mice and lack of any approved therapeutics prescribed for human. However, the intricacies of the Epsilon toxin action mechanism are yet to be understood. In this regard, various in silico tools have been exploited to model and refine the 3D structure of the toxin and its two receptors. The receptor proteins were embedded into designed lipid membranes within an aqueous and ionized environment...
January 12, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28089515/navigation-through-the-plasma-membrane-molecular-landscape-shapes-random-organelle-movement
#11
Alison R Dun, Gabriel J Lord, Rhodri S Wilson, Deirdre M Kavanagh, Katarzyna I Cialowicz, Shuzo Sugita, Seungmee Park, Lei Yang, Annya M Smyth, Andreas Papadopulos, Colin Rickman, Rory R Duncan
Eukaryotic plasma membrane organization theory has long been controversial, in part due to a dearth of suitably high-resolution techniques to probe molecular architecture in situ and integrate information from diverse data streams [1]. Notably, clustered patterning of membrane proteins is a commonly conserved feature across diverse protein families (reviewed in [2]), including the SNAREs [3], SM proteins [4, 5], ion channels [6, 7], and receptors (e.g., [8]). Much effort has gone into analyzing the behavior of secretory organelles [9-13], and understanding the relationship between the membrane and proximal organelles [4, 5, 12, 14] is an essential goal for cell biology as broad concepts or rules may be established...
January 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28089451/crystallogenesis-of-membrane-proteins-mediated-by-polymer-bounded-lipid-nanodiscs
#12
Jana Broecker, Bryan T Eger, Oliver P Ernst
For some membrane proteins, detergent-mediated solubilization compromises protein stability and functionality, often impairing biophysical and structural analyses. Hence, membrane-protein structure determination is a continuing bottleneck in the field of protein crystallography. Here, as an alternative to approaches mediated by conventional detergents, we report the crystallogenesis of a recombinantly produced membrane protein that never left a lipid bilayer environment. We used styrene-maleic acid (SMA) copolymers to solubilize lipid-embedded proteins into SMA nanodiscs, purified these discs by affinity and size-exclusion chromatography, and transferred proteins into the lipidic cubic phase (LCP) for in meso crystallization...
January 3, 2017: Structure
https://www.readbyqxmd.com/read/28089450/a-structural-model-for-vinculin-insertion-into-pip2-containing-membranes-and-the-effect-of-insertion-on-vinculin-activation-and-localization
#13
Peter M Thompson, Srinivas Ramachandran, Lindsay B Case, Caitlin E Tolbert, Arpit Tandon, Mihir Pershad, Nikolay V Dokholyan, Clare M Waterman, Sharon L Campbell
Vinculin, a scaffolding protein that localizes to focal adhesions (FAs) and adherens junctions, links the actin cytoskeleton to the adhesive super-structure. While vinculin binds to a number of cytoskeletal proteins, it can also associate with phosphatidylinositol 4,5-bisphosphate (PIP2) to drive membrane association. To generate a structural model for PIP2-dependent interaction of vinculin with the lipid bilayer, we conducted lipid-association, nuclear magnetic resonance, and computational modeling experiments...
December 31, 2016: Structure
https://www.readbyqxmd.com/read/28088738/piperine-modulates-isoproterenol-induced-myocardial-ischemia-through-antioxidant-and-anti-dyslipidemic-effect-in-male-wistar-rats
#14
Velumani Dhivya, Lohanathan Bharathi Priya, Hilda T Chirayil, Swamiappan Sathiskumar, Chih-Yang Huang, Viswanadha Vijaya Padma
Myocardial infarction due to ischemia accounts for majority of deaths among cardiovascular disorders. Isoproterenol (ISO) induced myocardial infarction and the protection offered by piperine was investigated in the present report. Lipid profile analysis by determining the levels of cholesterol, phospholipids, triglycerides and lipoproteins in serum and heart tissues showed anti-dyslipidemic action of piperine against ISO induced myocardial injury by modulating the ISO induced altered lipid profiles, maintaining to near control values...
January 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28088639/docosahexaenoic-acid-loaded-lipid-nanoparticles-with-bactericidal-activity-against-helicobacter-pylori
#15
Catarina Leal Seabra, Cláudia Nunes, Maria Gomez-Lazaro, Marta Correia, José Carlos Machado, Inês C Gonçalves, Celso A Reis, Salette Reis, M Cristina L Martins
Docosahexaenoic acid (DHA), an omega-3 polyunsaturated fatty acid present in fish oil, has been described as a promising molecule to the treatment of Helicobacter pylori gastric infection. However, due to its highly unsaturated structure, DHA can be easily oxidized loosing part of its bioactivity. This work aims the nanoencapsulation of DHA to improve its bactericidal efficacy against H. pylori. DHA was loaded into nanostructured lipid carriers (NLC) produced by hot homogenization and ultrasonication using a blend of lipids (Precirol ATO5(®), Miglyol-812(®)) and a surfactant (Tween 60(®))...
January 11, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28088624/oxidative-phospholipidomics-in-health-and-disease-achievements-challenges-and-hopes
#16
REVIEW
Ana Reis
Phospholipid peroxidation products are recognized as important bioactive lipid mediators playing an active role as modulators in signalling events in inflammation, immunity and infection. The biochemical responses are determined by the oxidation structural features present in oxPL modulating biophysical and biological properties in model membranes and lipoproteins. In spite of the extensive work conducted with model systems over the last 20 years, the study of oxPL in biological systems has virtually stagnated...
January 11, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28088576/lid-domain-plasticity-and-lipid-flexibility-modulate-enzyme-specificity-in-human-monoacylglycerol-lipase
#17
Laura Riccardi, Jose M Arencibia, Luca Bono, Andrea Armirotti, Stefania Girotto, Marco De Vivo
Human monoacylglycerol lipase (MAGL) is a membrane-interacting enzyme that generates pro-inflammatory signaling molecules. For this reason, MAGL inhibition is a promising strategy to treat pain, cancer, and neuroinflammatory diseases. MAGL can hydrolyze monoacylglycerols bearing an acyl chain of different lengths and degrees of unsaturation, cleaving primarily the endocannabinoid 2-arachidonoylglycerol. Importantly, the enzymatic binding site of MAGL is confined by a 75-amino-acid-long, flexible cap domain, named 'lid domain', which is structurally similar to that found in several other lipases...
January 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28088480/sensing-membrane-curvature-in-macroautophagy
#18
REVIEW
Nathan Nguyen, Vladimir Shteyn, Thomas J Melia
In response to intracellular stress events ranging from starvation to pathogen invasion, the cell activates one or more forms of macroautophagy. The key event in these related pathways is the de novo formation of a new organelle called the autophagosome, which surrounds and sequesters either random portions of the cytoplasm or selectively targets individual intracellular challenges. Thus the autophagosome is a flexible membrane platform with dimensions that ultimately depend upon the target cargo. The intermediate membrane, termed the phagophore or isolation membrane, is a cup-like structure with a clear concave face and a highly curved rim...
January 11, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28088472/cholesterol-and-ergosterol-affect-the-activity-of-staphylococcus-aureus-antibiotic-efflux-pumps
#19
S R Tintino, C D M Oliveira-Tintino, F F Campina, M S Costa, R P Cruz, R L S Pereira, J C Andrade, E O Sousa, J P Siqueira-Junior, H D M Coutinho, T C Leal-Balbino, V Q Balbino
The aim of this study is to evaluate the effect of ergosterol on steroids and cholesterol efflux pumps in multidrug resistant strains of S. aureus. Were used RN4220 harboring plasmid pUL5054, which carries the gene encoding the MsrA macrolide efflux protein; and IS-58, which possesses the TetK tetracycline efflux protein; 1199B resists hydrophilic fluoroquinolones via a NorA-mediated mechanism and wild strain 1199B. The Minimal Inhibitory Concentration (MIC) was determined and the evaluation of possible inhibition of efflux pumps by reduction of MIC...
January 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28088448/fast-formation-of-low-defect-density-tethered-bilayers-by-fusion-of-multilamellar-vesicles
#20
Tadas Ragaliauskas, Mindaugas Mickevicius, Bozena Rakovska, Tadas Penkauskas, David J Vanderah, Frank Heinrich, Gintaras Valincius
A facile and reproducible preparation of surface-supported lipid bilayers is essential for fundamental membrane research and biotechnological applications. We demonstrate that multilamellar vesicles fuse to molecular-anchor-grafted surfaces yielding low-defect-density, tethered bilayer membranes. Continuous bilayers are formed within 10min, while the electrically insulating bilayers with <0.1μm(-2) defect density can be accomplished within 60min. Surface plasmon resonance spectroscopy indicates that an amount of lipid material transferred from vesicles to a surface is inversely proportional to the density of an anchor, while the total amount of lipid that includes tethered and transferred lipid remains constant within 5% standard error...
January 11, 2017: Biochimica et Biophysica Acta
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