id stringlengths 4 8 | title stringlengths 1 642 | abstract stringlengths 50 17.9k |
|---|---|---|
15385494 | Strain-dependent role of BrkA during Bordetella pertussis infection of the murine respiratory tract. | Bordetella pertussis, the causative agent of whooping cough, expresses many virulence factors believed to be involved in infection and disease progression. While these factors as a group are required for infection, deletion of individual virulence factor genes generally has limited effects on the ability of B. pertussi... |
15383680 | Complex signals in the genomic 3' nontranslated region of bovine viral diarrhea virus coordinate translation and replication of the viral RNA. | The genomes of positive-strand RNA viruses strongly resemble cellular mRNAs. However, besides operating as a messenger to generate the virus-encoded proteins, the viral RNA serves also as a template during replication. A central issue of the viral life cycle, the coordination of protein and RNA synthesis, is yet poorly... |
15383679 | Nematode m7GpppG and m3(2,2,7)GpppG decapping: activities in Ascaris embryos and characterization of C. elegans scavenger DcpS. | A spliced leader contributes the mature 5'ends of many mRNAs in trans-splicing organisms. Trans-spliced metazoan mRNAs acquire an m3(2,2,7)GpppN cap from the added spliced leader exon. The presence of these caps, along with the typical m7GpppN cap on non-trans-spliced mRNAs, requires that cellular mRNA cap-binding prot... |
15373783 | Sequential observation of morphogenesis of cutaneous nerve fibers in fetal rat skin: an immunohistochemical and electron microscopic study. | Skin of DA/Slc rat fetuses removed on the fetal days 11 to 20 and on delivery day (21 days post-fertilization) was used. In the immunohistochemistry, the anti-neurofilament 69 kDa (NF68)-positive fibers appeared in the subepidermal dermis on the fetal day 12. The subepidermal and intraepidermal NF68-positive fibers rea... |
15375125 | The fur homologue in Borrelia burgdorferi. | Borrelia burgdorferi contains a gene that codes for a Fur homologue. The function of this Fur protein is unknown; however, spirochetes grown at 23 or 35 degrees C expressed fur as determined by reverse transcriptase PCR. The fur gene (BB0647) was cloned and overexpressed as a His-Fur fusion protein in Escherichia coli.... |
15367658 | PAM14, a novel MRG- and Rb-associated protein, is not required for development and T-cell function in mice. | PAM14 has been found to associate in complexes with the MORF4/MRG family of proteins as well as Rb, the tumor suppressor protein. This suggested that it might be involved in cell growth, immortalization, and/or senescence. To elucidate the in vivo function of PAM14, we characterized the expression pattern of mouse Pam1... |
15367656 | Swi1 and Swi3 are components of a replication fork protection complex in fission yeast. | Swi1 is required for programmed pausing of replication forks near the mat1 locus in the fission yeast Schizosaccharomyces pombe. This fork pausing is required to initiate a recombination event that switches mating type. Swi1 is also needed for the replication checkpoint that arrests division in response to fork arrest.... |
15367639 | Structure and mechanistic analysis of the anti-human immunodeficiency virus type 1 antibody 2F5 in complex with its gp41 epitope. | The membrane-proximal region of the ectodomain of the gp41 envelope glycoprotein of human immunodeficiency virus type 1 (HIV-1) is the target of three of the five broadly neutralizing anti-HIV-1 antibodies thus far isolated. We have determined crystal structures of the antigen-binding fragment for one of these antibodi... |
15367635 | Nuclear export of the nonenveloped parvovirus virion is directed by an unordered protein signal exposed on the capsid surface. | It is uncertain whether nonenveloped karyophilic virus particles may actively traffic from the nucleus outward. The unordered amino-terminal domain of the VP2 major structural protein (2Nt) of the icosahedral parvovirus minute virus of mice (MVM) is internal in empty capsids, but it is exposed outside of the shell thro... |
15367622 | The raft-promoting property of virion-associated cholesterol, but not the presence of virion-associated Brij 98 rafts, is a determinant of human immunodeficiency virus type 1 infectivity. | Lipid rafts are enriched in cholesterol and sphingomyelin and are isolated on the basis of insolubility in detergents, such as Brij 98 and Triton X-100. Recent work by Holm et al. has shown that rafts insoluble in Brig 98 can be found in human immunodeficiency virus type 1 (HIV-1) virus-like particles, although it is n... |
15367618 | Human macrophages, but not dendritic cells, are activated and produce alpha/beta interferons in response to Mopeia virus infection. | Lassa virus (LV) and Mopeia virus (MV) are closely related members of the Arenavirus genus, sharing 75% amino acid sequence identity. However, LV causes hemorrhagic fever in humans and nonhuman primates, whereas MV cannot induce disease. We have previously shown that antigen-presenting cells (APC)-macrophages (MP) and ... |
15351231 | Enhancing sensitivity of human herpes virus diagnosis with DNA microarrays using dendrimers. | DNA microarray technology has become a promising new tool for the detection and identification of viral pathogens in human plasma and cell cultures. For exploration of this technology, we have developed DNA microarrays that encode capture oligonucleotide probes for different human herpes viruses: herpes simplex virus (... |
15334646 | Localization of neurokinin 1 receptor (NK1R) immunoreactivity in rat esophagus. | The aim of the present immunohistochemical study was to investigate the localization of neurokinin 1 receptor (NK1R) in rat esophagus and examine the relationship between NK1Rs and intrinsic cholinergic, nitrergic, or substance P (SP) neurons. NK1R immunoreactivity (IR) was observed on the nerve cell bodies in the myen... |
15332284 | Antigenic alteration of influenza B virus associated with loss of a glycosylation site due to host-cell adaptation. | Effects of host-cell adaptation of the hemagglutinin (HA) protein were evaluated by the analyses of four pairs of recent influenza B field isolates, each pair consisting of an Madin Darby canine kidney (MDCK)- and an embryonated chicken egg-derived isolates from the same clinical specimen. Among the isolates examined, ... |
15312736 | Enhanced solubilization of arsenic and 2,3,4,6 tetrachlorophenol from soils by a cyclodextrin derivative. | The application of extracting aqueous solutions with cyclodextrins in several soil remediation technologies has been increasingly studied but little is known about their removal capacities toward the inorganic species. Herein, the effectiveness of cyclodextrins (CDs) in extracting arsenic, copper, and iron from a minin... |
15290688 | New chiral selectors: design and synthesis of 6-TBDMS-2,3-methyl beta-cyclodextrin 2-2' thioureido dimer and 6-TBDMS-2,3-methyl (or 2-methyl-3-acetyl) beta-cyclodextrin bearing an (R) Mosher acid moiety. | Cyclodextrin (CD) derivatives are important selectors for analytical chiral recognition. Their enantioselectivities and chemical properties depend on ring size and on nature, number and location of substituents. This paper describes the synthesis of 6-O-TBDMS-2,3-O-methyl beta-cyclodextrins bearing in position 2 either... |
15290685 | Determination of binding constants of cyclodextrin inclusion complexes with amino acids and dipeptides by potentiometric titration. | Cyclodextrins are well known for their ability to separate enantiomers of drugs, natural products, and other chiral substances using HPLC, GC, or CE. The resolution of the enantiomers is due to the formation of diastereomeric complexes between the cyclodextrin and the pairs of enantiomers. The aim of this study was to ... |
18007486 | Synthesis and spectroscopic characterization of new Schiff bases containing the benzo-15-crown-5 moiety. | New crown ether Schiff base derivatives were prepared by the condensation of 4'-formylbenzo-15-crown-5 or 4'-formyl-5'-hydroxybenzo-15-crown-5 with 1,2-bis(2-aminophenoxy)ethane. The structures of these new compounds were confirmed on the basis of elemental analysis, IR, (1)H- and (13)C-NMR, UV-Vis and mass spectroscop... |
15456513 | Relationship between CRP and hypofibrinolysis: Is this a possible mechanism to explain the association between CRP and outcome in critically ill patients? | BACKGROUND-: Endothelial cell dysfunction may be implicated in the development of multiple organ failure (MOF) by a number of mechanisms. Among these, altered fibrinolysis promotes fibrin deposition, which may create microvascular alterations during inflammation. Elevated concentrations of C-reactive protein (CRP), esp... |
15466432 | The Bacillus subtilis sin operon: an evolvable network motif. | The strategy of combining genes from a regulatory protein and its antagonist within the same operon, but controlling their activities differentially, can lead to diverse regulatory functions. This protein-antagonist motif is ubiquitous and present in evolutionarily unrelated regulatory pathways. Using the sin operon fr... |
15459093 | Photonic crystal glucose-sensing material for noninvasive monitoring of glucose in tear fluid. | <h4>Background</h4>We recently developed a photonic crystal glucose-sensing material, which consists of a crystalline colloidal array embedded within a polymer network of a polyacrylamide-poly(ethylene glycol) hydrogel with pendent phenylboronic acid groups. The aim of the present work was to improve this approach for ... |
15505710 | EPR and affinity studies of mannose-TEMPO functionalized PAMAM dendrimers. | Mannose-TEMPO functionalized G4-PAMAM dendrimers with increasing mannose loadings have been synthesized and characterized by MALDI-TOF MS and EPR spectroscopy. Analysis of linebroadening effects in the EPR spectra of these dendrimers allowed us to determine the relative presentation of mannose and TEMPO on the dendrime... |
15459340 | Crystal structure of human coactosin-like protein at 1.9 A resolution. | Human coactosin-like protein (CLP) shares high homology with coactosin, a filamentous (F)-actin binding protein, and interacts with 5LO and F-actin. As a tumor antigen, CLP is overexpressed in tumor tissue cells or cell lines, and the encoded epitopes can be recognized by cellular and humoral immune systems. To gain a ... |
15457208 | ACF1 improves the effectiveness of nucleosome mobilization by ISWI through PHD-histone contacts. | The nucleosome remodelling ATPase ISWI resides in several distinct protein complexes whose subunit composition reflects their functional specialization. Association of ISWI with ACF1, the largest subunit of CHRAC and ACF complexes, improves the efficiency of ISWI-induced nucleosome mobilization by an order of magnitude... |
15459285 | A new hydrogen-bonding potential for the design of protein-RNA interactions predicts specific contacts and discriminates decoys. | RNA-binding proteins play many essential roles in the regulation of gene expression in the cell. Despite the significant increase in the number of structures for RNA-protein complexes in the last few years, the molecular basis of specificity remains unclear even for the best-studied protein families. We have developed ... |
15459283 | Determination of thermodynamic parameters for HIV DIS type loop-loop kissing complexes. | The HIV-1 type dimerization initiation signal (DIS) loop was used as a starting point for the analysis of the stability of Watson-Crick (WC) base pairs in a tertiary structure context. We used ultraviolet melting to determine thermodynamic parameters for loop-loop tertiary interactions and compared them with regular se... |
15456901 | Repeated cycles of rapid actin assembly and disassembly on epithelial cell phagosomes. | We have found that early in infection of the intracellular pathogen Listeria monocytogenes in Madin-Darby canine kidney epithelial cells expressing actin conjugated to green fluorescent protein, F-actin rapidly assembles (approximately 25 s) and disassembles (approximately 30 s) around the bacteria, a phenomenon we cal... |
15543266 | Sextuplet phenyl embrace in a metal-organic Kagomé lattice. | A novel Kagomé lattice that demonstrates the modular nature of metal-organic networks has been prepared and is to our knowledge the first example of a metal-organic coordination polymer that incorporates the sextuplet phenyl embrace as a supramolecular synthon. |
15452130 | Cholesterol and 25-hydroxycholesterol inhibit activation of SREBPs by different mechanisms, both involving SCAP and Insigs. | The current paper demonstrates that cholesterol and its hydroxylated derivative, 25-hydroxycholesterol (25-HC), inhibit cholesterol synthesis by two different mechanisms, both involving the proteins that control sterol regulatory element-binding proteins (SREBPs), membrane-bound transcription factors that activate gene... |
15543263 | Crystal engineering in the aminophenols. Novel carborundum network in a supramolecular homologous series. | Molecular complexes of 4-(4-aminophenoxy)aniline with a series of diphenols are structurally homologous and adopt the carborundum III topology, which is an unprecedented network for organic solids. |
15451772 | G protein activation and cyclic AMP modulation by naloxone benzoylhydrazone in distinct layers of rat olfactory bulb. | 1 Naloxone benzoylhydrazone (NalBzoH) has initially been developed as an agonist of the pharmacologically defined kappa3-opioid receptor and has recently been employed as an antagonist at the opioid receptor-like (ORL1) receptor. In the present study, we investigated the ability of NalBzoH to elicit agonist-like effect... |
15452123 | Macrophage tropism of HIV-1 depends on efficient cellular dNTP utilization by reverse transcriptase. | Retroviruses utilize cellular dNTPs to perform proviral DNA synthesis in infected host cells. Unlike oncoretroviruses, which replicate in dividing cells, lentiviruses, such as human immunodeficiency virus type 1 (HIV-1) and simian immunodeficiency virus, are capable of efficiently replicating in non-dividing cells (ter... |
15449145 | Cross-reactivity among sapovirus recombinant capsid proteins. | Sapovirus (SaV), a member of the genus Sapovirus in the family Caliciviridae, is an agent of human and porcine gastroenteritis. SaV strains are divided into five genogroups (GI-GV) based on their capsid (VP1) sequences. Human SaV strains are noncultivable, but expression of the recombinant capsid protein (rVP1) in a ba... |
15514803 | Sensitivity increase in molecular recognition by decrease of the sensing particle size and by increase of the receptor binding site--a case with chemomechanical polymers. | For the first time it is shown that diminishing the particle size of a chemomechanical polymer leads to a dramatic sensitivity increase, with a large response triggered e.g. by action of external AMP; as illustrated with carbohydrate model complexes in solution, the necessary high binding affinity can be achieved by pr... |
15510260 | The ligand, the metal and the 'Holey'-host: Synthesis, structural and magnetic characterisation of Co(II), Ni(II) and Mn(II) metal-organic frameworks incorporating 4,4'-dicarboxy-2,2'-bipyridine. | We report herein the single crystal structures of four metal-organic framework complexes incorporating the 4,4'-dicarboxy-2,2'-bipyridine ligand, H(2)dcbp: alpha-[Co(dcbp)(H(2)O)(2)], 1; beta-[Co(dcbp)(H(2)O)(2)], 2, [Ni(dcbp)(H(2)O)(2)], and [[Mn(dcbp)].1/2DEF], 4 (DEF = diethylformamide). In each complex the ligand i... |
15480472 | Developments in inorganic crystal engineering. | The design and synthesis of crystalline materials through the self-assembly of molecular building blocks and the pursuit of functional materials based upon this approach are usually classified under the banner Crystal Engineering. The field is interdisciplinary in nature involving synthetic, materials, structural and t... |
15535832 | Collagen type II (CII)-specific antibodies induce arthritis in the absence of T or B cells but the arthritis progression is enhanced by CII-reactive T cells. | Antibodies against type II collagen (anti-CII) are arthritogenic and have a crucial role in the initiation of collagen-induced arthritis. Here, we have determined the dependence of T and B cells in collagen-antibody-induced arthritis (CAIA) during different phases of arthritis. Mice deficient for B and/or T cells were ... |
15514830 | Enhanced photoluminescence from poly(phenylene vinylene):dendrimer polyelectrolyte assemblies in solution. | Poly(2,5-methoxy-propyloxy sulfonate phenylene vinylene)(MPS-PPV) and DAB-Am-16, a generation 3.0 polypropylenimine hexadecamine dendrimer (DAB), are shown to form a tunable photoresponsive polyelectrolyte assembly in aqueous solution with an enhanced emission signal of up to 18-times that of MPS-PPV alone. |
15514798 | Periodic mesoporous phenylenesilicas with ether or sulfide hinge groups--a new class of PMOs with ligand channels. | A new class of periodic mesoporous organosilicas (PMOs) with 4-phenyl ether and 4-phenyl sulfide bridge-bonded silsesquioxanes integrated into the pore walls to create ligand channels have been synthesized using inorganic salt-assisted self-assembly directed by a supramolecular polyoxyethylene (10) stearyl ether (Brij ... |
15388875 | Cap-binding activity of an eIF4E homolog from Leishmania. | All eukaryotic mRNAs possess a 5'-cap (m(7)GpppN) that is recognized by a family of cap-binding proteins. These participate in various processes, such as RNA transport and stabilization, as well as in assembly of the translation initiation complex. The 5'-cap of trypanosomatids is complex; in addition to 7-methyl guano... |
15388871 | Template-dependent incorporation of 8-N3AMP into RNA with bacteriophage T7 RNA polymerase. | UV-induced photochemical crosslinking is a powerful approach that can be used for the identification of specific interactions involving nucleic acid-protein and nucleic acid-nucleic acid complexes. 8-AzidoATP (8-N(3)ATP) is a photoaffinity-labeling agent which has been widely used to elucidate the ATP binding site of a... |
15388640 | Role for sterol regulatory element-binding protein in activation of endothelial cells by phospholipid oxidation products. | Oxidized phospholipids, including oxidation products of palmitoyl-arachidonyl-phosphatidyl choline (PAPC), are mediators of inflammation in endothelial cells (ECs) and known to induce several chemokines, including interleukin-8 (IL-8). In this study, we show that oxidized PAPC (OxPAPC), which accumulates in atheroscler... |
15388849 | Probing conformational dynamics in single donor-acceptor synthetic molecules by means of photoinduced reversible electron transfer. | We use single-molecule fluorescence lifetimes to probe dynamics of photoinduced reversible electron transfer occurring between triphenylamine (donor) and perylenediimide (acceptor) in single molecules of a polyphenylenic rigid dendrimer embedded in polystyrene. Here, reversible electron transfer in individual donor-acc... |
15760059 | Molecular properties of ciprofloxacin-Indion 234 complexes. | The purpose of this research was to formulate tasteless complexes of ciprofloxacin with Indion 234 and to evaluate molecular properties of drug complexes. The effect of batch and column process, complexation time, temperature, and pH on ciprofloxacin loading on Indion 234 is reported. Drug resin complexes (DRC) were ch... |
15385630 | Maloriented bivalents have metaphase positions at the spindle equator with more kinetochore microtubules to one pole than to the other. | To test the "traction fiber" model for metaphase positioning of bivalents during meiosis, kinetochore fibers of maloriented bivalents, induced during recovery from cold arrest, were analyzed with a liquid crystal polarizing microscope. The measured birefringence retardation of kinetochore fibers is proportional to the ... |
15385629 | Bipolarization and poleward flux correlate during Xenopus extract spindle assembly. | We investigated the mechanism by which meiotic spindles become bipolar and the correlation between bipolarity and poleward flux, using Xenopus egg extracts. By speckle microscopy and computational alignment, we find that monopolar sperm asters do not show evidence for flux, partially contradicting previous work. We acc... |
15385624 | Inhibiting the Arp2/3 complex limits infection of both intracellular mature vaccinia virus and primate lentiviruses. | Characterizing cellular factors involved in the life cycle of human immunodeficiency virus type 1 (HIV-1) is an initial step toward controlling replication of HIV-1. Actin polymerization mediated by the Arp2/3 complex has been found to play a critical role in some pathogens' intracellular motility. We have asked whethe... |
15616691 | Light-induced electron transfer in porphyrin-calixarene conjugates. | The fluorescence from a set of porphyrin-calixarene complexes is quenched upon addition of benzo-1,4-quinone (BQ) in fluid solution. In N,N-dimethylformamide solution, fluorescence quenching involves both static and dynamic interactions but there are no obvious differences between porphyrins with or without the appende... |
15383666 | Targeted disruption of the Walker-Warburg syndrome gene Pomt1 in mouse results in embryonic lethality. | O-mannosylation is an important protein modification in eukaryotes that is initiated by an evolutionarily conserved family of protein O-mannosyltransferases. The first mammalian protein O-mannosyltransferase gene described was the human POMT1. Mutations in the hPOMT1 gene are responsible for Walker-Warburg syndrome (WW... |
15383660 | Relationship of Leffler (Bronsted) alpha values and protein folding Phi values to position of transition-state structures on reaction coordinates. | The positions of transition states along reaction coordinates (r++) for simple chemical reactions are often estimated from Leffler alpha values, the slope of plots of DeltaG++ (activation energy) versus DeltaG(0) (equilibrium free energy) for a series of structural variants. Protein folding is more complex than simple ... |
15383526 | Cyclosporin A inhibits flow-mediated activation of endothelial nitric-oxide synthase by altering cholesterol content in caveolae. | Fluid shear stress generated by blood flowing over the endothelium is a major determinant of arterial tone, vascular remodeling, and atherogenesis. Nitric oxide (NO) produced by endothelial NO synthase (eNOS) plays an essential role in regulation of vascular function and structure by blood flow. Although cyclosporin A ... |
15381766 | The formation of spherulites by amyloid fibrils of bovine insulin. | Bovine insulin has long been known to self-assemble in vitro into amyloid fibrils. We have observed a further higher-order self-association of the protein into spherical structures, with diameters typically around 50 microm but ranging from 10 to 150 microm. In a polarizing light microscope, these structures exhibit a ... |
15377534 | Oligomerization of amyloid Abeta16-22 peptides using hydrogen bonds and hydrophobicity forces. | The 16-22 amino-acid fragment of the beta-amyloid peptide associated with the Alzheimer's disease, Abeta, is capable of forming amyloid fibrils. Here we study the aggregation mechanism of Abeta16-22 peptides by unbiased thermodynamic simulations at the atomic level for systems of one, three, and six Abeta16-22 peptides... |
15377533 | Librational motion of spin-labeled lipids in high-cholesterol containing membranes from echo-detected EPR spectra. | Two-pulse, echo-detected (ED) electron paramagnetic resonance (EPR) spectroscopy was used to study the librational motions of spin-labeled lipids in membranes of dipalmitoylphosphatidylcholine + 50 mol % cholesterol. The temperature dependence, over the range 77-240 K, and the dependence on position of spin-labeling in... |
15377531 | Pattern formation during T-cell adhesion. | T cells form intriguing patterns during adhesion to antigen-presenting cells. The patterns are composed of two types of domains, which either contain short TCR/MHCp receptor-ligand complexes or the longer LFA-1/ICAM-1 complexes. The final pattern consists of a central TCR/MHCp domain surrounded by a ring-shaped LFA-1/I... |
15377527 | Sampling the self-assembly pathways of KFFE hexamers. | The formation of amyloid fibrils is often encountered in Alzheimer's disease, type II diabetes, and transmissible spongiform encephalopathies. In the last few years, however, mounting evidence has suggested that the soluble oligomers of amyloid-forming peptides are also cytotoxic agents. Understanding the early pathway... |
15377520 | The structure of tip links and kinocilial links in avian sensory hair bundles. | Recent studies have indicated that the tip links and kinocilial links of sensory hair bundles in the inner ear have similar properties and share a common epitope, and that cadherin 23 may also be a component of each link type. Transmission electron microscopy was therefore used to study and compare the fine structure o... |
15377511 | Charged lipid vesicles: effects of salts on bending rigidity, stability, and size. | The swelling behavior of charged phospholipids in pure water is completely different from that of neutral or isoelectric phospholipids. It was therefore suggested in the past that, instead of multilamellar phases, vesicles represent the stable structures of charged lipids in excess water. In this article, we show that ... |
15510267 | Honeycombs, herringbones and brick-walls; three-fold guest-dependent variation in copper trimesate complexes bearing sulfimide ligands. | Reaction of a solution of CuSO(4) and S,S'-diphenylsulfimide, Ph(2)SNH 1, with sodium salts of trimesic acid (H(3)tma) in MeOH gives the 2-D coordination network [Cu(3)(Ph(2)SNH)(6)(tma)(2)] in which each trimesate is bound to three copper centres. Addition of other solvents to the reaction mixture causes a change in t... |
15480461 | Building blocks for cyclotriveratrylene-based coordination networks. | The incorporation of three-fold symmetric organic host molecules into coordination polymers should allow for the construction of new and interesting network structures, capable of multiple inclusion behaviour. A range of new multi-dentate bridging ligands/molecular hosts have been prepared by appending nitrogen-contain... |
15377789 | Premature aggregation of type IV collagen and early lethality in lysyl hydroxylase 3 null mice. | Collagens carry hydroxylysine residues that act as attachment sites for carbohydrate units and are important for the stability of crosslinks but have been regarded as nonessential for vertebrate survival. We generated mice with targeted inactivation of the gene for one of the three lysyl hydroxylase isoenzymes, LH3. Th... |
15616704 | A spectroscopic and photophysical study on molecular recognition via hydrogen-bonding and pi-pi stacking interactions. | Spectroscopic and photophysical properties of a Kemp's tricarboxylic acid derivative having an anthracene chromophore (I) upon recognition of 9-butyladenine (BA) in chloroform were studied in detail. Molecular recognition of BA by I via hydrogen-bonding and pi-pi stacking interactions were sensed successfully on the ba... |
15375179 | Structural features of apolipoprotein B synthetic peptides that inhibit lipoprotein(a) assembly. | Lipoprotein(a) [Lp(a)] is assembled via an initial noncovalent interaction between apolipoprotein B100 (apoB) and apolipoprotein(a) [apo(a)] that facilitates the formation of a disulfide bond between the two proteins. We previously reported that a lysine-rich, alpha-helical peptide spanning human apoB amino acids 4372-... |
15480462 | Self-assembly of two-component peptidic dendrimers: dendritic effects on gel-phase materials. | The self-assembly of diaminododecane solubilised by different dendritic peptides, possessing increasing levels of dendritic branching, was investigated. The dendritic peptides were based on l-lysine building blocks and were of first, second and third generation, containing one, three and seven amino acid repeat units r... |
15367795 | Conformational analysis: crystallographic, molecular mechanics and quantum chemical studies of C--H...O hydrogen bonding in the flexible bis(nosylate) derivative of catechol. | The single-crystal X-ray diffraction analysis of 2-[[(4-nitrophenoxy)sulfonyl]oxy]phenyl 4-nitrophenyl sulfate (4) reveals that an interesting intermolecular or extended structure (a one-dimensional hydrogen-bonded polymer) is formed because of pairs of intermolecular (aryl)C--H...O(nitro) hydrogen bonds between the C(... |
15367791 | Experimental electron density study of the supramolecular aggregation between 4,4'-dipyridyl-N,N'-dioxide and 1,4-diiodotetrafluorobenzene at 90 K. | The electron density of the halogen-bonded complex of 4,4'-dipyridyl-N,N'-dioxide (bpNO) with 1,4-diiodotetrafluorobenzene (F(4)dIb) at 90 K has been determined by X-ray diffraction and analysed. The nature of the I.O intermolecular bond connecting the bpNO and F(4)dIb molecules into one-dimensional infinite chains, as... |
15480454 | Supramolecular aggregates between carboxylate anions and an octaaza macrocyclic receptor. | The 28-membered octaazamacrocycle Me2[28]py2N6 was used as a receptor for the molecular recognition of aromatic and aliphatic carboxylate substrates. The receptor-substrate binding behaviour of (H6Me2[28]py2N6)6+ with an aliphatic (-O2C(CH2)nCO2-, n=0 to 4) and an aromatic (phthalate, isophthalate, terephthalate, 4,4'-... |
15367579 | Quantitative signature for architectural organization of regulatory factors using intranuclear informatics. | Regulatory machinery for replication and gene expression is punctately organized in supramolecular complexes that are compartmentalized in nuclear microenvironments. Quantitative approaches are required to understand the assembly of regulatory machinery within the context of nuclear architecture and to provide a mechan... |
15365187 | De novo synthesis and development of an RNA enzyme. | Arbitrary manipulation of molecular recognition at the atomic level has many applications. However, systematic design and de novo synthesis of an artificial enzyme based on such manipulation has been a long-standing challenge in the field of chemistry and biotechnology. In this report, we developed an artificial RNA li... |
15365170 | Structural basis for the interaction of Escherichia coli NusA with protein N of phage lambda. | The C terminus of transcription factor NusA from Escherichia coli comprises two repeat units, which bind during antitermination to protein N from phage lambda. To delineate the structural basis of the NusA-lambdaN interaction, we attempted to crystallize the NusA C-terminal repeats in complex with a lambdaN peptide (re... |
15361413 | Neutrophil adhesive contact dependence on impingement force. | Neutrophil capture and recruitment from the circulation requires the formation of specific receptor/ligand bonds under hydrodynamic forces. In the present study we examine bond formation between beta2-integrins on neutrophils and immobilized ICAM-1 while using micropipettes to control the force of contact between the c... |
15361411 | Rearrangement of the 16S precursor subunits is essential for the formation of the active 20S proteasome. | Proteasome-dependent proteolysis is essential for a number of key cellular processes and requires a sophisticated biogenesis pathway to function. Here, we have arrested the assembly process in its dynamic progression at the short-lived 16S state. Structural analysis of the 16S proteasome precursor intermediates by elec... |
15483702 | Influence of the coordination geometry on the physicochemical properties of a copper(II) complex with a tailor-made calixarene-based ligand bearing dipyridyl pendants. An ESR, UV-Vis and CV study. | Dipyridyl pendants, suitably attached onto a calix[4]arene fixed in its 1,3-alternate conformation, form stable complexes with copper(ii) in acetonitrile. Both the mononuclear and the homobinuclear species ([Cu(1)](2+) and [Cu(2)(1)](4+)), previously detected through a UV-Vis investigation, have been studied by ESR, UV... |
15455163 | Evaluation of alternative approaches for the synthesis of macrocyclic bisindolylmaleimides. | Approaches for the synthesis of macrocyclic bisindolylmaleimides, in which the indole nitrogens are linked with a tether, are described. Two alternative approaches were investigated: macrocyclisation in either the 'southern' (by adding the tether to the bisindolylmaleimide ring system) or the 'northern' district. With ... |
15358781 | MLE functions as a transcriptional regulator of the roX2 gene. | Dosage compensation is a process that equalizes transcription activity between the sexes. In Drosophila, two non-coding RNA, roX1 and roX2, and at least six protein regulators, MSL-1, MSL-2, MSL-3, MLE, MOF, and JIL-1, have been identified as essential for dosage compensation. Although there is accumulating evidence of... |
15455144 | Design, synthesis, biological activity and structural analysis of cyclic peptide inhibitors targeting the substrate recruitment site of cyclin-dependent kinase complexes. | Inhibition of cyclin A- and cyclin E-associated cyclin-dependent kinase-2 (CDK2) activities is an effective way of selective induction of apoptotic cell death via the E2F pathway in tumour cells. The cyclin groove recognition motif (CRM) in the natural CDK-inhibitory (CDKI) tumour suppressor protein p27KIP1 was used as... |
15358833 | Effective and robust plasmid topology analysis and the subsequent characterization of the plasmid isoforms thereby observed. | Within the biopharmaceutical industry, recombinant plasmid DNA is used both as a raw material (e.g. in lentiviral and AAV vector production) as well as an active ingredient (e.g. in DNA vaccines). Consequently, many analytical laboratories are routinely involved with plasmid DNA topoisoform qualitative analysis and qua... |
15356003 | Calcium-dependent self-assembly of human centrin 2. | Human centrin 2 (HsCen2) is a member of the EF-hand superfamily of calcium-binding proteins, often associated with the centrosomes and basal bodies. These organelles exhibit different morphological aspects, including a variety of centrin-containing fibers that connect the two centrioles or other structural elements of ... |
15356270 | Echovirus 1 endocytosis into caveosomes requires lipid rafts, dynamin II, and signaling events. | Binding of echovirus 1 (EV1, a nonenveloped RNA virus) to the alpha2beta1 integrin on the cell surface is followed by endocytic internalization of the virus together with the receptor. Here, video-enhanced live microscopy revealed the rapid uptake of fluorescently labeled EV1 into mobile, intracellular structures, posi... |
15356261 | Megator, an essential coiled-coil protein that localizes to the putative spindle matrix during mitosis in Drosophila. | We have used immunocytochemistry and cross-immunoprecipitation analysis to demonstrate that Megator (Bx34 antigen), a Tpr ortholog in Drosophila with an extended coiled-coil domain, colocalizes with the putative spindle matrix proteins Skeletor and Chromator during mitosis. Analysis of P-element mutations in the Megato... |
15489978 | Supramolecular complex composed of a covalently linked zinc porphyrin dimer and fulleropyrrolidine bearing two axially coordinating pyridine entities. | A zinc porphyrin dimer-fullerene supramolecular complex with a large association constant is assembled; efficient intramolecular photoinduced electron transfer from the singlet excited state of zinc porphyrin to the fullerene is observed. |
15355976 | Recoverin and rhodopsin kinase activity in detergent-resistant membrane rafts from rod outer segments. | Cholesterol-rich membranes or detergent-resistant membranes (DRMs) have recently been isolated from bovine rod outer segments and were shown to contain several signaling proteins such as, for example, transducin and its effector, cGMP-phosphodiesterase PDE6. Here we report the presence of rhodopsin kinase and recoverin... |
15490017 | Isolation of equatorial conformers of chloro- and bromocyclohexane in a pure state as inclusion complexes with a host compound. | The equatorial conformers of chloro- and bromocyclohexane were isolated in a pure state as inclusion complexes with a host compound, and their structures were studied by IR spectra and X-ray analysis. |
15489974 | Supramolecular isomerism in spin crossover networks with aurophilic interactions. | Assembly of Fe(II), 3-cyanopyridine and [Au(CN)2](-) affords, in one-pot reaction, three coordination polymers that represent a genuine example of supramolecular isomerism with strong influence in the spin crossover regime of the Fe(II) ions. |
15353599 | Ultrafast hydration dynamics in protein unfolding: human serum albumin. | We report studies of unfolding and ultrafast hydration dynamics of the protein human serum albumin. Unique in this study is our ability to examine different domains of the same protein and the intermediate on the way to the unfolded state. With femtosecond resolution and site-selective labeling, we isolate the dynamics... |
15353545 | Visualization of early chromosome condensation: a hierarchical folding, axial glue model of chromosome structure. | Current models of mitotic chromosome structure are based largely on the examination of maximally condensed metaphase chromosomes. Here, we test these models by correlating the distribution of two scaffold components with the appearance of prophase chromosome folding intermediates. We confirm an axial distribution of to... |
15350203 | Protein-polymer nano-machines. Towards synthetic control of biological processes. | The exploitation of nature's machinery at length scales below the dimensions of a cell is an exciting challenge for biologists, chemists and physicists, while advances in our understanding of these biological motifs are now providing an opportunity to develop real single molecule devices for technological applications.... |
15489973 | A metallo-capped polyrotaxane containing calix[4]arenes and cyclodextrins and its highly selective binding for Ca2+. | A water-soluble nanometer-scale metallocapped polyrotaxane has been prepared by the inclusion complexation of azo-calixarenes with metallo-bridged bis(beta-CD)s, displaying highly selective binding for Ca(2+). |
15489972 | Solvent-mediated self-association of a Horning-crown macrocycle. | A member of a new class of novel macrocycles possessing both polyether and phenolic functionalities, forms dimers in both the solid-state and in solution when exposed to chloroform, dichloromethane or toluene, but does not self-associate in the presence of dimethyl sulfoxide. |
15455150 | Synthesis and binding properties of calix[4]arenes with [2 + 2'] mixed ligating functional groups. | A series of mixed [2 + 2'] p-tert-butylcalix[4]arene have been synthesised by selective 1,3-dialkylation of phenolic groups using various alkylating agents such as benzyl bromide, methyl iodide, ethyl bromoacetate, and 2-methoxyethyl tosylate. The extraction and complexation properties of the synthesized calixarenes to... |
15455146 | [2]Rotaxanes containing pyridinium-phosphonium axles and 24-crown-8 ether wheels. | A triethylphosphonium group attached to a pyridinium ethane moiety can be used as an axle for the self-assembly of [2]pseudorotaxanes and [2]rotaxanes. Although [2]pseudorotaxane formation is limited due to the bulk of the PR4+ group, [2]rotaxanes can be formed utilising 24-crown-8 ether, benzo-24-crown-8 ether and nap... |
15351785 | Antigen-independent acquisition of MHC class II molecules by human T lymphocytes. | We report here that human T lymphocytes have the capacity of acquiring large amounts of MHC class II molecules from various types of antigen-presenting cells (APC) in an antigen-independent manner. The transfer of MHC class II molecules from APC to T cell required direct cell-to-cell contact and appeared to involve the... |
15350211 | Coactivators p300 and PCAF physically and functionally interact with the foamy viral trans-activator. | <h4>Background</h4>Foamy virus Bel1/Tas trans-activators act as key regulators of gene expression and directly bind to Bel1 response elements (BRE) in both the internal and the 5'LTR promoters leading to strong transcriptional trans-activation. Cellular coactivators interacting with Bel1/Tas are unknown to date.<h4>Res... |
15507152 | Regulation of FeLV-945 by c-Myb binding and CBP recruitment to the LTR. | <h4>Background</h4>Feline leukemia virus (FeLV) induces degenerative, proliferative and malignant hematologic disorders in its natural host, the domestic cat. FeLV-945 is a viral variant identified as predominant in a cohort of naturally infected animals. FeLV-945 contains a unique sequence motif in the long terminal r... |
15347592 | Mobile actin clusters and traveling waves in cells recovering from actin depolymerization. | At the leading edge of a motile cell, actin polymerizes in close apposition to the plasma membrane. Here we ask how the machinery for force generation at a leading edge is established de novo after the global depolymerization of actin. The depolymerization is accomplished by latrunculin A, and the reorganization of act... |
15347591 | Cholesterol depletion increases membrane stiffness of aortic endothelial cells. | This study has investigated the effect of cellular cholesterol on membrane deformability of bovine aortic endothelial cells. Cellular cholesterol content was depleted by exposing the cells to methyl-beta-cyclodextrin or enriched by exposing the cells to methyl-beta-cyclodextrin saturated with cholesterol. Control cells... |
15347583 | Pressure denaturation of staphylococcal nuclease studied by neutron small-angle scattering and molecular simulation. | We studied the pressure-induced folding/unfolding transition of staphylococcal nuclease (SN) over a pressure range of approximately 1-3 kilobars at 25 degrees C by small-angle neutron scattering and molecular dynamics simulations. We find that applying pressure leads to a twofold increase in the radius of gyration deri... |
15347812 | Role of KaiC phosphorylation in the circadian clock system of Synechococcus elongatus PCC 7942. | In the cyanobacterium Synechococcus elongatus PCC 7942, KaiA, KaiB, and KaiC are essential proteins for the generation of a circadian rhythm. KaiC is proposed as a negative regulator of the circadian expression of all genes in the genome, and its phosphorylation is regulated positively by KaiA and negatively by KaiB an... |
15345063 | Strategies for the recovery of active proteins through refolding of bacterial inclusion body proteins. | Recent advances in generating active proteins through refolding of bacterial inclusion body proteins are summarized in conjunction with a short overview on inclusion body isolation and solubilization procedures. In particular, the pros and cons of well-established robust refolding techniques such as direct dilution as ... |
15483716 | Molecular, supramolecular and solution structures of peroxovanadium complexes with ON and O3N donor set ligands: two new types of cationic-anionic peroxovanadium(V) peroxovanadates(V). | The complexes, [VO(O(2))(pa)(2)]ClO(4).3H(2)O (1), [VO(O(2))(pa)(2)][VO(O(2))(2)(pa)].3H(2)O (2), [VO(O(2))(pa)(2)][VO(O(2))(ada)].2H(2)O (3) and [VO(O(2))(pa)(pca)].H(2)O (4)[pa = picolinamide, ada = carbamoylmethyliminodiacetate(2-) and pca = 2-pyrazinecarboxylate(1-)], were synthesized. 2 and 3 are new types of pero... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.