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Results 201 - 250 of 1001
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Ayatollahi Seyyed Abdulmajid SA Department of pharmacognosy, School of Pharmacy, Shahid Beheshti University, M.C., Tehran, Iran. ; School of Pharmacy and Phytochemistry Research Centre, Shahid Beheshti University of Medical Sciences, Tehran, - - 2012
Despite all modern surgical techniques, skin flap that is considered as the main method in most reconstructive surgeries puts the skin tissue at danger of necrosis and apoptosis derived from ischemia. Therefore, finding a treatment for decreasing the apoptosis derived from flap ischemia will be useful in clinic. In present ...
Pike Katharine C KC Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton S016 6YD, - - 2012
Variation in exposure to polyunsaturated fatty acids (PUFAs) might influence the development of atopy, asthma, and wheeze. This study aimed to determine whether differences in PUFA concentrations in maternal plasma phosphatidylcholine are associated with the risk of childhood wheeze or atopy. For 865 term-born children, we measured phosphatidylcholine fatty acid ...
Yu H - - 2011
Toll-like receptors 7 and 8 (TLR7/8), known as pattern recognition receptors (PRR), are currently viewed as important targets for the development of new therapies for multiple diseases. Therefore, manipulating the immune response by using TLR7/8 agonists or antagonists might be of therapeutic value. Nucleic acid-like structures are well-known TLR7/8 ligands, ...
Pallan Pradeep S PS Department of Biochemistry, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232, United - - 2012
Locked nucleic acid (LNA) analogues with 2',4'-bridged sugars show promise in antisense applications. S-5'-Me-LNA has high RNA affinity, and modified oligonucleotides show weakened immune stimulation in vivo. Conversely, an R-5'-methyl group dramatically lowers RNA affinity. To test the effects of S- and R-6'-methyl groups on 3'-fluoro hexitol nucleic acid (FHNA) ...
Qin Luoheng - - 2011
Fluorinated amino acids serve as powerful tools in protein chemistry. We synthesized a series of para-substituted tetrafluorophenylalanines via the regioselective S(NAr) chemistry of the commercially available pentafluorophenylalanine Boc-Z. These novel unnatural amino acids display distinct (19)F NMR signatures, making them powerful tools for analyzing protein-membrane interactions with NMR spectroscopy.
Cheng Juanli J College of Life Sciences, South China Agricultural University, Guangzhou, - - 2012
Ralstonia solanacearum, a major phytopathogenic bacterium, causes a bacterial wilt disease in diverse plants. Although fatty acid analyses of total membranes of R. solanacearum showed that they contain primarily palmitic (C(16:0)), palmitoleic (C(16:1)) and cis-vaccenic (C(18:1)) acids, little is known regarding R. solanacearum fatty acid synthesis. The R. solanacearum GMI1000 ...
Bali Ustav - - 2011
A series of potent carboxylic acid DGAT1 inhibitors with high permeability were developed from a virtual screening hit. Strategies were employed to reduce Pgp substrate recognition and increase passive permeability, resulting in the discovery of a series showing good inhibition of cellular triglyceride synthesis. The mutagenic potential of prospective metabolites ...
Giacalone Francesco - - 2011
Asymmetric organocatalysis is now recognized as the third pillar of asymmetric synthesis. Recent years have witnessed increasing interest towards the use of highly active and stereoselective organocatalysts. This critical review documents the advances in the development of chiral organocatalysts which are systematically used in ≤3 mol% loading in all the ...
Rikimaru Kentaro - - 2011
Herein, we describe the design, synthesis, and structure-activity relationships of novel benzylpyrazole acylsulfonamides as non-thiazolidinedione (TZD), non-carboxylic-acid-based peroxisome proliferator-activated receptor (PPAR) γ agonists. Docking model analysis of in-house weak agonist 2 bound to the reported PPARγ ligand binding domain suggested that modification of the carboxylic acid of 2 would help ...
Krstić Ivan - - 2011
In this chapter we describe the application of CW and pulsed EPR methods for the investigation of structural and dynamical properties of RNA and DNA molecules and their interaction with small molecules and proteins. Special emphasis will be given to recent applications of dipolar spectroscopy on nucleic acids.
Guo Min M Department of Cancer Biology, The Scripps Research Institute, Scripps Florida, Jupiter, FL 33458, United - - 2012
Proteins are precisely assembled with amino acids by matching the anticodons of charged transfer RNAs to nucleotide triplets in mRNA sequences. Accurate translation depends on the specific coupling of cognate amino acids and tRNAs - a step carried out by aminoacyl-tRNA synthetases (aaRSs) and that generates the genetic code. Owing ...
Basu Sankha S SS Centers of Excellence in Environmental Toxicology and Cancer Pharmacology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, - - 2012
Stable isotope labeling by essential nutrients in cell culture (SILEC) was recently developed to generate isotopically labeled coenzyme A (CoA) and short-chain acyl-CoA thioesters. This was accomplished by modifying the widely used technique of stable isotope labeling by amino acids in cell culture to include [(13)C(3)(15)N]-pantothenate (vitamin B(5)), a CoA ...
Sun Ting - - 2011
(18)F labeled natural amino acids have been introduced as promising tumor imaging agents. A novel [(18)F]fluoro amino acid analog 1-[(18)F]fluoroethyl-L-tryptophan (1-[(18)F]FETrp) was designed and synthesized by a two-pot three-step procedure, including the synthesis of 1-[(18)F]fluoro-2- (tosyloxy)ethane, the [(18)F]fluoroethylation of the precursor N-Boc-L-tryptophan ethyl ester and following the deprotection of the ...
Zhang Liying - - 2011
To explore the molecular mechanisms of oleanolic acid, two novel photoaffinity probes were synthesized based on the structure-activity relationship reported previously. Their potency were evaluated in an enzyme inhibition assay against rabbit muscle glycogen phosphorylase a (RMGPa), a known target protein of oleanolic acid. The inhibitory activity of probe 2 ...
Mignon Pierre - - 2011
In the present study, DFT periodic plane wave calculations, at the PBE-D level of theory, were carried out to investigate the interaction of DNA nucleobases with acidic montmorillonite. The surface model was considered in its octahedral (Osub) and tetrahedral (Tsub) substituted forms, known to have different acidic properties. The adsorption ...
Steinmann Dirk - - 2011
The therapy of type-2 diabetes mellitus is one of the major challenges of our age. A possible strategy to prevent the progression of this disease is the inhibition of protein tyrosine phosphatase 1B (PTP1B), a major negative regulator in the insulin and leptin signalling pathway. Phellodendri amurensis cortex is a ...
Zhang Wen - - 2011
Base-T-specific recognition element: A chiral aliphatic amino acid, (S)-β-hydroxyl-γ-aminobutyric acid, when incorporated into polyamides, can act as a novel T-specific recognition element in DNA minor groove sequence-specific recognition event. Good flexibility of the novel T-reader implies that it could be incorporated into longer polyamides to regulate their curvature and thus ...
Koschker Philipp - - 2011
We report on the first intermolecular asymmetric catalytic regio- and enantioselective addition of carboxylic acids to terminal allenes to form valuable branched allylic esters employing a rhodium(I)/(R,R)-DIOP catalyst system.
Gomes Mariana P B - - 2011
Prion diseases remain a challenge to modern science in the 21st century because of their capacity for transmission without an encoding nucleic acid. PrP(Sc) , the infectious and alternatively folded form of the PrP prion protein, is capable of self-replication, using PrP(C) , the properly folded form of PrP, as ...
Jakubowski Hieronim - - 2011
Faithful translation of the genetic code during protein synthesis is fundamental to the growth, development, and function of living organisms. Aminoacyl-tRNA synthetases (AARSs), which define the genetic code by correctly pairing amino acids with their cognate tRNAs, are responsible for 'quality control' in the flow of information from a gene ...
Zhang Li - - 2011
Disinfection of drinking water reduces pathogenic infection, but generates disinfection by-products (DBPs) in drinking water. In this study, the effect of fifteen DBPs on DNA damage in human-derived hepatoma line (HepG2) was investigated by the single cell gel electrophoresis (SCGE) assay. These fifteen DBPs are: four trihalomethanes (THMs), six haloacetic ...
McLeod Michael C - - 2011
The full details of our enantioselective formal synthesis of the biologically active natural product berkelic acid are described. The insertion of the C-18 methyl group proved challenging, with three different approaches investigated to install the correct stereochemistry. Our initial Horner-Wadsworth-Emmons/oxa-Michael approach to the berkelic acid core proved unsuccessful upon translation ...
Spork Anatol Peter - - 2011
Novel hybrid structures of (5'-deoxy-)uridine and glycine were conceived and synthesized. Such nucleosyl amino acids (NAAs) represent simplified analogues of the core structure of muraymycin nucleoside antibiotics, making them useful synthetic building blocks for structure-activity relationship (SAR) studies. The key step of the developed synthetic route was the efficient and ...
Shrestha Ajaya Ram - - 2011
A novel derivative of 2',4'-bridged nucleic acid, named hydroxamate bridged nucleic acid (HxNA), containing six-membered perhydro-1,2-oxazin-3-one ring, was designed and synthesized. The introduction of a carbonyl function along with an N-O linkage in the six-membered bridged structure is the unique structural feature of the novel 2',4'-bridged nucleic acid analogue. The ...
Montis Costanza - - 2011
We report on the association of anionic liposomes from POP-Ade:POPC (1-palmitoyl-2-oleoyl-phosphatidyladenosine and 1-palmitoyl-2-oleoyl-phosphatidylcholine, respectively) with single- and double-strand nucleic acids, mediated by Ca(2+) bridging. The structural and dynamical features of such complexes are compared with those displayed when the nucleolipid is replaced by POPG (1-palmitoyl-2-oleoyl-sn-phosphatidyl-glycerol), characterized by the same apolar ...
Arian Dumitru - - 2011
Photocatalytic activity of a photosensitizer (PS) in an oligodeoxyribonucleotide duplex 5'-PS∼ODN1/ODN2∼Q-3' is inhibited because of close proximity of a quencher Q. The ODN2 in this duplex is selected to be longer than the ODN1. Therefore, in the presence of a nucleic acid (analyte), which is fully complementary to the ODN2 ...
Richard Emmanuel - - 2011
Different cellular steps of acid maltase synthesis and subsequent glycogen degradation, by Emmanuel Richard, Gaëlle Douillard-Guilloux, and Catherine Caillaud, pp. 979-986.
Theofilopoulos Argyrios N - - 2011
A collection of molecular sensors has been defined by studies in the last decade that can recognize a diverse array of pathogens and initiate protective immune and inflammatory responses. However, if the molecular signatures recognized are shared by both foreign and self-molecules, as is the case of nucleic acids, then ...
Agarwal Hitesh K - - 2011
Of the three closo-carborane isomers (C(2)B(10)H(12)), closo-1,2-carborane has been used most widely in the synthesis of carboranyl amines. However, closo-1,2-carboranes are prone to deboronation to nido-7,8-carborane under various conditions including attack by basic amino groups. In order to overcome this problem, closo-1,7-carboranyl ethyl-, propyl-, and butylamine were synthesized, which should ...
Stefani Hélio A - - 2011
A series of 2,5-diaryl substituted furans functionalized with several amino acids were synthesized and evaluated as the cyclooxygenases COX-1 and COX-2 enzymes inhibitors. The proline-substituted compound inhibited PGE(2) secretion by LPS-stimulated neutrophils, suggesting selectivity for COX-2. Molecular docking studies in the binding site of COX-2 were performed.
Gu Wenxin - - 2011
(S)-2-Boc-Amino-8-(R)-(tert-butyldimethylsilanyloxy) decanoic acid, the Boc-protected precursor of an unusual amino acid residue for the synthesis of microsporin B, was synthesized. The key steps include a Suzuki coupling followed by asymmetric homogeneous hydrogenation.
Banerjee Amit - - 2011
Stereoselective synthesis of 2-phenyl-oxazolines and 2-phenyl-oxazines via Lewis acid initiated intramolecular cyclization of benzylidene acetal with an azide functional group is described.
Shah Bhavik P - - 2012
Fatty acid-induced stimulation of enteroendocrine cells leads to release of the hormones such as cholecystokinin (CCK) that contribute to satiety. Recently, the fatty acid activated G protein-coupled receptor GPR120 has been shown to mediate long-chain unsaturated free fatty acid-induced CCK release from the enteroendocrine cell line, STC-1, yet the downstream ...
Milne Jacqueline Elizabeth - - 2011
A new convenient and scalable synthesis of phenylacetic acids has been developed via the iodide catalyzed reduction of mandelic acids. The procedure relies on in situ generation of hydroiodic acid from catalytic sodium iodide, employing phosphorus acid as the stoichiometric reductant.
Zick Suzanna M SM Department of Family Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA. - - 2011
Inhibitors of COX indicate that upregulation of inflammatory eicosanoids produced by COX, and in particular prostaglandin E(2) (PGE(2)), are early events in the development of colorectal cancer (CRC). Ginger has shown downregulation of COX in vitro and decreased incidence/multiplicity of adenomas in rats. This study was conducted to determine if ...
Bomholt Niels - - 2011
A new locked pyranosyl nucleoside was synthesized by phenylsulfinyl-assisted chemistry. The novel building block was inserted into oligonucleotides and provides new insight on conformational restricted pyranosyl nucleosides on duplex formation.
Shimizu Hiroyo - - 2011
Synthesis of tetrasaccharide portion of ganglioside HPG-1 is described. The tetrasaccharide sequence, Fuc-α(1,8)-Neu5Gc-α(2,4)-Neu5Ac-α(2,6)-Glc, was successfully assembled by a linear strategy, in which the 1,5-lactamized sialyl galactose acceptor and the 8-O-Lev-N-Troc-sialic acid donor were exploited as key units.
Kumar Pradeep - - 2011
The effect of sub-lethal feeding of bait formulations containing molluscicidal component of Ferula asafoetida (ferulic acid, umbelliferone), Syzygium aromaticum (eugenol) and Carum carvi (limonene) on biochemical changes in the ovotestis of snail Lymnaea acuminata were studied. Bait formulations feeding to L. acuminata were studied in clear glass aquaria having diameter ...
Vasilyeva Svetlana V - - 2011
A series of novel nucleoside 5'-triphosphates and phosphoramidites containing alkyne or amino groups for the postsynthetic functionalization of nucleic acids were designed and synthesized. For this purpose, the new 3-aminopropoxypropynyl linker group was used. It contains two alternative functional capabilities: an amino group for the reaction of amino-alkynyl-modified oligonucleotides with ...
Chhatra Rajesh K - - 2011
A novel method for the synthesis of a bile acid-based macrocycle has been developed using click chemistry. The 1,2,3-triazolium derivative of the macrocycle shows remarkable selectivity in binding of chloride ion.
Gellner Magdalena - - 2011
Self-assembly of gold nanospheres with a very thin glass shell onto the surface of beads yields a plasmonically active micron-sized substrate for integrated solid-phase synthesis and label-free SERS analysis. The proof-of-principle of this approach is demonstrated by the vibrational spectroscopic discrimination of three distinct amino acids and a dipeptide.
Oh Joong-Suk - - 2011
Catalytic dynamic kinetic resolution (DKR) of racemic azlactones with EtOD using squaramide-based dimeric cinchona alkaloid organocatalysts is shown to be a highly effective strategy for the preparation of enantiomerically pure α-deuterated chiral α-amino acids.
Sarotra Pooja - - 2011
Fish oil (FO) rich in n-3 polyunsaturated fatty acids (PUFAs) have a protective role in autoimmune disorders, type 2 diabetes, rheumatoid arthritis, and cancer, whereas corn oil (CO) rich in n-6 PUFAs has a proinflammatory and procarcinogenic effect. A balanced n-3/n-6 PUFA ratio in diet rather than absolute intake of ...
Callahan Kathryn E - - 2012
The L1 (LINE 1) retrotransposable element encodes two proteins, ORF1p and ORF2p. ORF2p is the L1 replicase, but the role of ORF1p is unknown. Mouse ORF1p, a coiled-coil-mediated trimer of ∼42-kDa monomers, binds nucleic acids and has nucleic acid chaperone activity. We purified human L1 ORF1p expressed in insect cells ...
Vishwanatha T M - - 2011
One-pot click chemistry of N(α)-Boc-bromomethylketones, NaN(3) and propiolic acid affords N-Boc protected 1,4-disubstituted 1,2,3-β-ketotriazole acids in good to excellent yield. The use of CuI as catalyst and DMSO as solvent leads the click reaction to efficient, practical and column-free preparation of the title compounds. The utility of the resulting unnatural ...
Li Yan - - 2011
Glycosylation of the acid labile betulin and betulinic acid derivatives was achieved with glycosyl ortho-hexynylbenzoates as donors under the catalysis of PPh(3)AuNTf(2); this enabled the efficient synthesis of lupane-type saponins, as exemplified by the total synthesis of the proposed betulinic acid trisaccharide from Bersama engleriana.
Blose Joshua M - - 2011
Osmolytes are small, chemically diverse, organic solutes that function as an essential component of cellular stress response. Protecting osmolytes enhance protein stability via preferential exclusion, and nonprotecting osmolytes, such as urea, destabilize protein structures. Although much is known about osmolyte effects on proteins, less is understood about osmolyte effects on ...
McLeod Michael C - - 2011
An enantioselective formal synthesis of berkelic acid is described. The key step involves a late-stage silyl enol ether addition to a benzannulated oxonium ion with subsequent spiroketalization leading to construction of the tetracyclic core. Thermodynamically controlled equilibration under acidic conditions affords the desired spiroketal configuration as a single diastereoisomer.
Wang Hsin-Neng - - 2011
A label-free approach using plasmonic coupling interference (PCI) nanoprobes for nucleic acid detection using surface-enhanced Raman scattering (SERS) is described. To induce a strong plasmonic coupling effect, a nanonetwork of silver nanoparticles with the Raman label located between adjacent nanoparticles is assembled by Raman-labeled DNA-locked nucleic acid (LNA) duplexes. The ...
Kim Gha-Young - - 2011
NanoGene assay is a magnetic bead and quantum dot nanoparticles based gene quantification assay. It relies on a set of probe and signaling probe DNAs to capture the target DNA via hybridization. We have demonstrated the inhibition resistance of the NanoGene assay using humic acids laden genomic DNA (gDNA). At ...
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