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https://www.readbyqxmd.com/read/28535664/characterization-of-alphax-i-domain-binding-to-receptors-for-advanced-glycation-end-products-rage
#1
Dolgorsuren Buyannemekh, Sang-Uk Nham
The b2 integrins are cell surface transmembrane proteins regulating leukocyte functions, such as adhesion and migration. Two members of b2 integrin, aMb2 and aXb2, share the leukocyte distribution profile and integrin aXb2 is involved in antigen presentation in dendritic cells and transendothelial migration of monocytes and macrophages to atherosclerotic lesions. Receptor for advanced glycation end products (RAGE), a member of cell adhesion molecules, plays an important role in chronic inflammation and atherosclerosis...
May 24, 2017: Molecules and Cells
https://www.readbyqxmd.com/read/28535038/fabrication-of-a-biodegradable-implant-with-tunable-characteristics-for-bone-implant-applications
#2
Iman Manavitehrani, Ali Fathi, Yiwei Wang, Peter K Maitz, Farid Mirmohseni, Tegan L Cheng, Lauren Peacock, David G Little, Aaron Schindeler, Fariba Dehghani
Biodegradable polymers are appealing material for the manufacturing of surgical implants as such implants break down in vivo, negating the need for a subsequent operation for removal. Many biocompatible polymers produce acidic breakdown products that can lead to localized inflammation and osteolysis. This study assesses the feasibility of fabricating implants out of poly(propylene carbonate) (PPC)-starch that degrades into CO2 and water. The basic compression modulus of PPC-starch (1:1 w/w) is 34 MPa; however, the addition of glycerol (1% w/w) and water as plasticizers doubles this value and enhances the surface wettability...
May 23, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28534487/rules-of-engagement-between-%C3%AE-v%C3%AE-6-integrin-and-foot-and-mouth-disease-virus
#3
Abhay Kotecha, Quan Wang, Xianchi Dong, Serban L Ilca, Marina Ondiviela, Rao Zihe, Julian Seago, Bryan Charleston, Elizabeth E Fry, Nicola G A Abrescia, Timothy A Springer, Juha T Huiskonen, David I Stuart
Foot-and-mouth disease virus (FMDV) mediates cell entry by attachment to an integrin receptor, generally αvβ6, via a conserved arginine-glycine-aspartic acid (RGD) motif in the exposed, antigenic, GH loop of capsid protein VP1. Infection can also occur in tissue culture adapted virus in the absence of integrin via acquired basic mutations interacting with heparin sulphate (HS); this virus is attenuated in natural infections. HS interaction has been visualized at a conserved site in two serotypes suggesting a propensity for sulfated-sugar binding...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28532068/synthetic-peptides-derived-from-salivary-proteins-and-the-control-of-surface-charge-densities-of-dental-surfaces-improve-the-inhibition-of-dental-calculus-formation
#4
Bernd Grohe
Peptides descended from the salivary proteins statherin and histatin were recently identified in saliva and the acquired enamel pellicle (AEP), a proteomic layer coated on enamel. In particular, the statherin phosphopeptide DpSpSEEKFLR (DSS) was found to adsorb to enamel-like hydroxyapatite and inhibit plaque-related crystal formation. To determine the mechanism of these processes, we studied peptide-crystal interactions based on the sequences DSS and RKFHEKHHSHRGYR (RKF). The latter is a basic histatin sequence showing antimicrobial effects...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531225/protein-charge-distribution-in-proteomes-and-its-impact-on-translation
#5
Rodrigo D Requião, Luiza Fernandes, Henrique José Araujo de Souza, Silvana Rossetto, Tatiana Domitrovic, Fernando L Palhano
As proteins are synthesized, the nascent polypeptide must pass through a negatively charged exit tunnel. During this stage, positively charged stretches can interact with the ribosome walls and slow the translation. Therefore, charged polypeptides may be important factors that affect protein expression. To determine the frequency and distribution of positively and negatively charged stretches in different proteomes, the net charge was calculated for every 30 consecutive amino acid residues, which corresponds to the length of the ribosome exit tunnel...
May 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28531138/phytochemical-composition-and-antioxidant-capacity-of-seven-saskatoon-berry-amelanchier-alnifolia-nutt-genotypes-grown-in-poland
#6
Sabina Lachowicz, Jan Oszmiański, Łukasz Seliga, Stanisław Pluta
The basic chemical composition, bioactive compounds, and antioxidant capacity of fruits of three new Polish breeding clones (No. 5/6, type S, and type N) and four Canadian cultivars (cvs.) ("Martin", "Smoky", "Pembina", and "Honeywood") grown in Poland in 2016 were investigated. Fruits were analyzed for their contents of triterpenoids, carotenoids, chlorophylls, and polyphenolics with the ultra-performance liquid chromatography photodiode detector-quadrupole/time-of-flight mass spectrometry (UPLC-PDA-Q/TOF-MS) method, sugar with the high-performance liquid chromatography-evaporative light scattering detector (HPLC-ELSD) method, and antioxidant capacity with the ability to reduce free radical (ABTS) and ferric reducing ability of plasma (FRAP) method...
May 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28530579/fatty-acid-and-sterol-composition-of-tea-seed-oils-their-comparison-by-the-fancytiles-approach
#7
Xiaoqin Wang, Qiumei Zeng, Vito Verardo, María Del Mar Contreras
Confusion among tea seed oils from Sect. Thea, Oleifera and Camellia in Camellia is a widespread problem in research and production. In this work, 22 fatty acids, squalene and 13 phytosterols in the three groups of tea seed oils from 16 Chinese regions were analyzed with GC-FID and GC-MS respectively. Thea oils were significantly higher in linoleic (C18:2) and palmitic (C16:0) acids but lower in oleic acid (C18:1) than Camellia and Oleifera oils while the latter two overlapped in major fatty acids. Similarly, Camellia and Oleifera oils clustered together based on the data of squalene and 12 phytosterols while Thea oils branched from them in HCA...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28530165/basic-amino-acids-in-the-n-terminal-half-of-the-pb2-subunit-of-influenza-virus-rna-polymerase-are-involved-in-both-transcription-and-replication
#8
Koyu Hara, Takahito Kashiwagi, Nobuyuki Hamada, Hiroshi Watanabe
The PB2 subunit of influenza virus RNA polymerase is known to be involved in the initiation of transcription of the virus genome via cap binding. However, other specific roles of PB2 for viral RNA synthesis are not well understood. Here, we demonstrate that basic residues, 124R, 142R, 143R, 268R and 331K/332R, in the N-terminal half of PB2 are important for the polymerase activity. Notably, R124A mutation remarkably reduced the synthesis of mRNA, cRNA and vRNA in vivo, which was in good agreement with the data obtained in vitro...
May 22, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28528984/risk-reclassification-ability-of-uric-acid-for-cardiovascular-outcomes-in-essential-hypertension
#9
Maria Perticone, Giovanni Tripepi, Raffaele Maio, Antonio Cimellaro, Desirée Addesi, Rossella Baggetta, Angela Sciacqua, Giorgio Sesti, Francesco Perticone
BACKGROUND: Hyperuricemia is associated with incident cardiovascular events in different settings of patients. We tested whether the inclusion of uric acid (UA) in Cox models including standard risk factors allows to better stratify cardiovascular risk in a cohort of 1522 naïve hypertensives with preserved renal function. METHODS: We used multiple Cox regression models to assess the independent effect of UA on cardiovascular outcomes, and Harrell'C index, Net Reclassification Index (NRI), and Integrated Discrimination Improvement (IDI) as indicators of the additional prognostic value of UA beyond and above that provided by standard risk factors and estimated glomerular filtration rate (e-GFR)...
May 13, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28528175/heterodimeric-v-%C3%A2-nikolskii-phospholipases-a2-induce-aggregation-of-the-lipid-bilayer
#10
A S Alekseeva, D S Tretiakova, V P Chernikov, Yu N Utkin, J G Molotkovsky, E L Vodovozova, I A Boldyrev
We report that the action of the heterodimeric phospholipases A2 (PLA2s) from Vipera nikolskii, which comprises enzymatically active basic subunit and inactive acidic PLA2 homologue, on the lipid bilayer results in the aggregation and stacking of bilayers. These processes are demonstrated using two independent methods (fluorescence spectroscopy and electron microscopy). Aggregation of bilayers is possible because both subunits of the V. nikolskii heterodimer contain a membrane-binding site (also known as IBS)...
May 17, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28526135/regulation-of-cell-calcium-and-role-of-plasma-membrane-calcium-atpases
#11
T Calì, M Brini, E Carafoli
The plasma membrane Ca(2+) ATPase (PMCA pump) is a member of the superfamily of P-type pumps. It has 10 transmembrane helices and 2 cytosolic loops, one of which contains the catalytic center. Its most distinctive feature is a C-terminal tail that contains most of the regulatory sites including that for calmodulin. The pump is also regulated by acidic phospholipids, kinases, a dimerization process, and numerous protein interactors. In mammals, four genes code for the four basic isoforms. Isoform complexity is increased by alternative splicing of primary transcripts...
2017: International Review of Cell and Molecular Biology
https://www.readbyqxmd.com/read/28522193/ph-triggered-re-assembly-of-nanosphere-to-nanofiber-the-role-of-peptide-conformational-change-for-enhanced-cancer-therapy
#12
Peiqing Liang, Junjiong Zheng, Shulin Dai, Jiayu Wang, Zhaoqing Zhang, Ting Kang, Changyun Quan
pH-triggered conformational change and subsequent re-assembly of nanostructures provide a new strategy in nanomedicine for controlled drug release and enhanced therapy. Here, we reported the development of a novel pH-responsive nano-assembly as a drug carrier from peptide amphiphile (PA) consisting of mimicking peptide and stearic acid moieties. The mimicking peptide is a basic 17-amino acid peptide derived from antennapedia homeodomain, and undergoes a conformational transition of the secondary structure from β-sheet at pH7...
May 15, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28521953/optimized-selection-of-liquid-chromatography-conditions-for-wide-range-analysis-of-natural-compounds
#13
Aurélie Periat, Davy Guillarme, Jean-Luc Veuthey, Julien Boccard, Sofia Moco, Denis Barron, Alexandre Grand-Guillaume Perrenoud
Plant secondary metabolites are an almost unlimited reservoir of potential bioactive compounds. In view of the wide chemical space covered by natural compounds, their comprehensive analysis requires multiple and complementary approaches. In this study, numerous chromatographic conditions were tested for the analysis of a set of 120 representative natural compounds covering a wide polarity range (18 log P units). The experiments were performed on 59 different conditions involving 29 RPLC and HILIC dedicated stationary phases, as well as more exotic mixed mode columns...
May 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28521678/ipgk-pseaac-identify-lysine-phosphoglycerylation-sites-in-proteins-by-incorporating-four-different-tiers-of-amino-acid-pairwise-coupling-information-into-the-general-pseaac
#14
Li-Ming Liu, Yan Xu, Kuo-Chen Chou
BACKGROUND: Occurring at Lys residues, the PGK (lysine phosphoglycerylation) is a special kind of post-translational modification (PTM). It may invert the charge potential of the modified residue and change the protein structures and functions, causing various diseases in liver, brain, and kidney. OBJECTIVE: From the angles of both basic research and drug development, we are facing a critical challenging problem: for an uncharacterized protein sequence containing many Lys residues, which ones can be of phosphoglycerylation, and which ones cannot? METHOD: To address this problem, we have developed a predictor called iPGK-PseAAC by incorporating into the general PseAAC (pseudo amino acid composition) with four different tiers of amino acid pairwise coupling information, where tiers 1, 2, 3, and 4 refer to the amino acid pairwise couplings between all the 1st, 2nd, 3rd, and 4th most contiguous residues along a protein segment, respectively...
May 15, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28521235/integrated-bioconversion-of-syngas-into-bioethanol-and-biopolymers
#15
Borja Lagoa-Costa, Haris Nalakath Abubackar, María Fernández-Romasanta, Christian Kennes, María C Veiga
Syngas bioconversion is a promising method for bioethanol production, but some VFA remains at the end of fermentation. A two-stage process was set-up, including syngas fermentation as first stage under strict anaerobic conditions using C. autoethanogenum as inoculum, with syngas (CO/CO2/H2/N2, 30/10/20/40) as gaseous substrate. The second stage consisted in various fed-batch assays using a highly enriched PHA accumulating biomass as inoculum, where the potential for biopolymer production from the remaining acetic acid at the end of the syngas fermentation was evaluated...
May 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28521002/changes-in-microbiome-during-and-after-travellers-diarrhea-what-we-know-and-what-we-do-not
#16
David A Rasko
The study of bacterial pathogens has advanced from culture on plates to basic biochemical studies; to sequencing reference genomes and attempting to ascribe those qualities to the whole species; to evaluating complete communities based on the universal marker of the 16S rRNA gene; to now sequencing all available nucleic acids in any sample to characterize the community as a whole. These types of scientific advances highlight that there are multiple layers of information within any sample, and to some extent we are only now beginning to be able to identify, categorize and understand the complex interactions of the host, pathogen and microbiome...
April 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28520406/characterization-of-dspe-peg2000-and-its-complex-with-doxorubicin-using-nmr-spectroscopy-and-molecular-dynamics
#17
Weidong Hu, Allen Mao, Patty Wong, Adrien Larsen, Paul J Yazaki, Jeffrey Y C Wong, John E Shively
Polyethyleneglycol (PEG) lipid nanoparticles (LNPs) spontaneously assemble in water forming uniform sized nanoparticles incorporating drugs with prolonged blood clearance over drugs alone. Previously, DSPE-PEG2000 and several drug adducts, including doxorubicin, were analyzed by a combination of physical and molecular dynamic (MD) studies. In this study a complete chemical shift assignment of DSPE-PEG2000 plus or minus doxorubicin was achieved using NMR 1D-selNOESY, NOESY, COSY, TOCSY, HSQC and HSQC-TOCSY. Chemical shift perturbation, titration, relaxation enhancement and NOESY analysis combined with MD reveal detailed structural information at the atomic level including location of doxorubicin in the micelle, its binding constant, the hydrophilic shell organization and the mobility of PEG2000 tail, demonstrating NMR spectroscopy can characterize drug-DSPE-PEG2000 micelles with molecular weights above 180kDa...
May 18, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28518190/sequential-incorporation-of-metallic-cations-cd-2-and-hg-2-and-n-octylamine-into-titanium-phosphate-nanoparticles-and-their-subsequent-release-in-acid-media
#18
Javier Carrasco-Rodríguez, Daniel Martín-Yerga, Leoncio Garrido, Agustín Costa-García, Francisco J García Alonso
Titanium phosphate nanoparticles, TPNP, consisting of a NaTi2(PO4)3 core and a shell of hydrogen phosphate and dihydrogen phosphate of titanium, undergo fast hydrolysis in water releasing phosphoric acid. This reaction is inhibited in the presence of metallic ions like Cd(2+) or Hg(2+), which are able to replace the protons of the shell acid phosphates. The amount of the adsorbed metallic cations could be regulated using counterions of different basicity. The resulting nanoparticles also incorporate NH2(CH2)7CH3 (N-octylamine) at room temperature forming N-octylammonium/phosphate ion pairs, but it was found that at higher cation concentration inside the nanoparticle, a lower amount of amine was adsorbed...
May 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28518188/ph-dependent-absorption-spectrum-of-a-protein-a-minimal-electrostatic-model-of-anabaena-sensory-rhodopsin
#19
Michael Stenrup, Elisa Pieri, Vincent Ledentu, Nicolas Ferré
A minimal electrostatic model is introduced which aims at reproducing and analyzing the visible-light absorption energy shift of a protein with pH. It relies on the existence of a protein structure, the prediction of titratable amino-acid pKa values and a very limited set of parameters. Applied to the case of the photochromic Anabaena sensory rhodopsin protein, the model succeeds in reproducing qualitatively the reported experimental data, confirming the importance of aspartic acid 217 in the observed blue shift in the λmax of ASR at neutral pH...
May 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28516444/toxicological-analysis-of-opiates-from-alternative-matrices-collected-from-an-exhumed-body
#20
Marta Cippitelli, Dora Mirtella, Giovanni Ottaviani, Giovanna Tassoni, Rino Froldi, Mariano Cingolani
In this case study, the body of a 45-year-old man was exhumed after 1 year at the request of the public prosecutor to assess whether the death was caused by drug consumption. Toxicological analyses were performed on several matrices, including liver, kidney, and the alternative matrices hair and teeth. The systematic toxicological analysis (STA), which consisted of basic and acid liquid/liquid extraction and gas chromatography-mass spectrometry (GC-MS) analysis, showed the presence of opiates in each of the matrices analyzed...
May 18, 2017: Journal of Forensic Sciences
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