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See detailMolecular dynamic simulation of the cyclic lipodepsipeptide Pseudodesmin A self-assembly
Crowet, Jean-Marc ULg; Sinnaeve, Davy; Fehér, Krisztina et al

Conference (2014, February 10)

Pseudodesmine A is a cyclic lipodepsipeptide of nine residues which presents a moderate antibacterial activity and whose structure has been resolved by X-ray and NMR1,2. In acetonitrile, Pseudodesmine A ... [more ▼]

Pseudodesmine A is a cyclic lipodepsipeptide of nine residues which presents a moderate antibacterial activity and whose structure has been resolved by X-ray and NMR1,2. In acetonitrile, Pseudodesmine A is monomeric while in chloroform it has the same structure but assemble in a supramolecular complex. This structure could associate with membranes and be responsible of the biological activity of this peptide. Comparison of the NMR data between the two solvents has given indications on the intermolecular contacts that arise in chloroform and a model for the self association was proposed2,3. To study in more details this assembly, molecular dynamics have been carried on. In acetonitrile, the peptide show transient interactions while in chlorofom interactions between monomers was always observed. As stated in Sinnaeve et al. in 2009, these interactions arise mainly between the backbone protons of the LEU1 and the GLN2, the GLN2 sidechain and the loop located on the opposite end of the monomer structure. From 10 simulations of dimerization, hydrogen bonds were followed and specific interaction patterns were identified regarding the hydrogen bonds formed. The peptide interactions are mainly described by 13 interaction patterns; 8 with the peptides in a linear configuration, 1 perpendicular and 4 with peptides side by side. The patterns are characterized by 2 to 4 hydrogen bonds. From the linear dimer, it is possible to reconstruct filaments and, by combining a linear and a lateral dimer, it is possible to build fibrils with multi filaments, as expected in the NMR derived model. Besides, the perpendicular dimer can gives peptide rings that can also explain the potential ability of this peptide to form ion pores in membranes. 1. Sinnaeve, D., Michaux, C., Van hemel, J., Vandenkerckhove, J., Peys, E., Borremans, F. a. M., Sas, B., Wouters, J. and Martins, J. C. Tetrahedron 2009, 65, 4173–4181. 2. Sinnaeve, D., Hendrickx, P. M. S., Van Hemel, J., Peys, E., Kieffer, B. and Martins, J. C. Chemistry (Weinheim an der Bergstrasse, Germany) 2009, 15, 12653–62. 3. Sinnaeve, D., Delsuc, M.-A., Martins, J. C. and Kieffer, B. Chemical Science 2012, 3, 1284. [less ▲]

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See detailMolecular dynamic simulations of a beta amphiphilic peptide
Crowet, Jean-Marc ULg; Deschamps, Antoine; Soumillion, Patrice et al

Conference (2013, October 03)

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See detailMolecular dynamics simulations of laser-induced damage of nanostructures and solids.
Diakhate, Momar ULg

in Applied Physics A : Materials Science & Processing (2009), 96

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See detailMolecular effectors and modulators of hypericin-mediated cell death in bladder cancer cells
Buytaert, E.; Matroule, J. Y.; Durinck, S. et al

in Oncogene (2008)

Photodynamic therapy (PDT) is an anticancer approach utilizing a light-absorbing molecule and visible light irradiation to generate, in the presence of O(2), cytotoxic reactive oxygen species, which cause ... [more ▼]

Photodynamic therapy (PDT) is an anticancer approach utilizing a light-absorbing molecule and visible light irradiation to generate, in the presence of O(2), cytotoxic reactive oxygen species, which cause tumor ablation. Given that the photosensitizer hypericin is under consideration for PDT treatment of bladder cancer we used oligonucleotide microarrays in the T24 bladder cancer cell line to identify differentially expressed genes with therapeutic potential. This study reveals that the expression of several genes involved in various metabolic processes, stress-induced cell death, autophagy, proliferation, inflammation and carcinogenesis is strongly affected by PDT and pinpoints the coordinated induction of a cluster of genes involved in the unfolded protein response pathway after endoplasmic reticulum stress and in antioxidant response. Analysis of PDT-treated cells after p38(MAPK) inhibition or silencing unraveled that the induction of an important subset of differentially expressed genes regulating growth and invasion, as well as adaptive mechanisms against oxidative stress, is governed by this stress-activated kinase. Moreover, p38(MAPK) inhibition blocked autonomous regrowth and migration of cancer cells escaping PDT-induced cell death. This analysis identifies new molecular effectors of the cancer cell response to PDT opening attractive avenues to improve the therapeutic efficacy of hypericin-based PDT of bladder cancer. [less ▲]

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See detailMolecular Elasticity of a Mechanically-Linked Polymer
Lussis, Perrine ULg; Fustin, C.-A; Van Quaethem, A et al

Conference (2010, July 11)

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See detailMolecular epidemiology of canine parvovirus, Europe
Decaro, Nicolas; Desario, Costantino; Addie, Diane D. et al

in Emerging Infectious Diseases (2007), 13(8), 1222-1224

Canine parvovirus (CPV), which causes hemorrhagic enteritis in dogs, has 3 antigenic variants: types 2a, 2b, and 2c. Molecular method assessment of the distribution of the CPV variants in Europe showed ... [more ▼]

Canine parvovirus (CPV), which causes hemorrhagic enteritis in dogs, has 3 antigenic variants: types 2a, 2b, and 2c. Molecular method assessment of the distribution of the CPV variants in Europe showed that the new variant CPV-2c is widespread in Europe and that the viruses are distributed in different countries. [less ▲]

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See detailMolecular epidemiology of extended-spectrum beta-lactamase-producing Enterobacteriaceae colonizing the digestive tract of patients admitted to intensive care units in a Belgian university hospital
CHRISTIAENS, Geneviève ULg; Damas, Pierre ULg; Docquier, J. D. et al

in American Society of Microbiology (Ed.) Program and Abstracts of the 46th Intersciences Conference on Antimicrobial Agents and Chemotherapy (2006, September)

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See detailMolecular epidemiology of norovirus in symptomatic and asymptomatic population in Burkina Faso
HUYNEN, Pascale ULg; Mauroy, Axel ULg; Martin, Caroline et al

Poster (2012, September)

Background Noroviruses (NoV), belonging to the family Caliciviridae, are now recognized as the leading cause of gastroenteritis outbreaks worldwide, and represent an important cause of sporadic ... [more ▼]

Background Noroviruses (NoV), belonging to the family Caliciviridae, are now recognized as the leading cause of gastroenteritis outbreaks worldwide, and represent an important cause of sporadic gastroenteritis in both children and adults. Many studies describe NoV epidemiology. However, few data are available about the NoV strains circulating in most of African countries, in particular in Burkina Faso. The population of Burkina Faso is characterized by the young age of its habitants, and most are living in rural environment. Objectives The purpose of this epidemiological study was to determine the prevalence of NoV in Bobo Dioulasso (Southern part of Burkina Faso) by molecular diagnosis methods in patients presenting or not gastroenteritis symptoms, to quantify the excreted viral load, and to genotype the circulating strains. Methods Patients with and without gastro-intestinal disorders were selected in several Health Care Centres of Bobo Dioulasso. Clinical and epidemiological data, as well as stool samples, were collected during 8 weeks through March to April 2011. Viral genomic RNA was automatically extracted with a Maxwell® (Promega) instrument. Molecular detection of genogroups (G) I, II and IV NoV in stool samples was performed by a home-made real-time RT-PCR targeting the ORF1-ORF2 polymerase junction region. For each positive sample, viral load was estimated by using standard curves (successive dilutions of recombinant GI and GII plasmids). Molecular characterization was performed on the detected strains, using both polymerase and capsid regions. Results NoV were detected in 21.6% of the 453 collected stool samples, with a distribution of 21.0% and 23.1% in the samples from the 319 symptomatic (SP) and the 134 asymptomatic patients (AP) respectively. Genogroup distribution was 7.2% for GI, 10.7% for GII and 3.1% for both GI and GII among SP’s samples, and was 11.2% for GI, 10.4% for GII and 1.5% for both GI and GII among AP’s samples. Average viral load values were higher for GI NoV in SP than in AP (p=0.02), when they were higher for GII NoV in AP than in SP (p=0.04). Phylogenic analysis showed a high degree of genotypical diversity in both groups of patients. One recombinant strain GII.7/GII.6 was also detected, to our knowledge, for the first time. Conclusion Even if a true pathogenic role of NoV could not be showed from the study design, it allowed to precise the molecular epidemiology of NoV strains prevalent in a representative country of the East African region. It also showed that asymptomatic patients could play an important role as a NoV “reservoir”. Despite the fact that GII strains, and more precisely those belonging to GII.4 genotype, are nowadays highly reported worldwide, the surprising proportion of NoV GI detected in this study suggests that GI and GII strains should be excreted in equal proportion in the environment. The origin of this epidemiologic difference, even if partially explained by the difference in immunity and genetic sensitivity of the population, is still to be solved. [less ▲]

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See detailMolecular epidemiology of norovirus infections in symptomatic and and asymptomatic children from Bobo Dioulasso, Burkina Faso
HUYNEN, Pascale ULg; Mauroy, Axel ULg; Martin, Caroline et al

in Journal of Clinical Virology (2013), 58

Background: Noroviruses (NoV) are a leading cause of gastroenteritis worldwide. Few epidemiologicaldata regarding the NoV strains circulating in African countries are available.Objectives: To determine ... [more ▼]

Background: Noroviruses (NoV) are a leading cause of gastroenteritis worldwide. Few epidemiologicaldata regarding the NoV strains circulating in African countries are available.Objectives: To determine the prevalence of NoV in Bobo Dioulasso (Burkina Faso) in both symptomaticand asymptomatic gastroenteritis patients.Study design: Patients both with and without gastro-intestinal disorders were selected. Clinical andepidemiological data, as well as stool samples, were collected through March to April 2011.NoV molecular detection (genogrouping and genotyping) and viral load quantification were also per-formed for all samples.Results: NoV were detected in 22.2% of the 418 collected stool samples (21.2% and 24.8% from the 293symptomatic patients (SP) and the 125 asymptomatic patients (ASP) respectively).Genogroup (G) distribution was 7.5%, 10.2% and 3.4% for GI, GII and both GI/GII respectively among SPand 12.0%, 11.2% and 1.6% for GI, GII and both GI/GII, respectively, among ASP.Average viral load values were higher in SP than in ASP for GI (p = 0.03) but not for GII.Phylogenic analysis showed a high degree of genotype diversity in SP and ASP. One recombinantGII.7/GII.6 sequence was, to the best of our knowledge, detected for the first time.Conclusions: This study enabled identification of the specific molecular epidemiology of NoV strains cir-culating in a representative country in Eastern Africa, and additionally showed that ASP could play animportant “reservoir” role. A high strain diversity was detected with a surprisingly high proportion ofNoV GI compared to the common genotypes usually reported in comparable epidemiological studies. [less ▲]

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See detailMolecular Evidence For An Andean Origin And A Secondary Gene Pool For The Lima Bean (Phaseolus Lunatus L..) Using Chloroplast Dna
Fofana, B.; Baudoin, Jean-Pierre ULg; Vekemans, X. et al

in Theoretical and Applied Genetics (1999), 98(2),

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See detailMolecular evidence of Anaplasma phagocytophilum in wild boar (Sus scrofa) in Belgium
Nahayo, Adrien; Bardiau, Marjorie ULg; Volpe, Rosario ULg et al

in BMC Veterinary Research (2014), 10(80),

Anaplasma phagocytophilum is a tick-borne pathogen of veterinary and human importance. Both ticks as vectors and vertebrates as reservoir hosts are essential for the cycle maintenance of this bacterium ... [more ▼]

Anaplasma phagocytophilum is a tick-borne pathogen of veterinary and human importance. Both ticks as vectors and vertebrates as reservoir hosts are essential for the cycle maintenance of this bacterium. Currently, the whole range of animal species reservoirs for A. phagocytophilum in natural environment is still unknown. Therefore, the aim of this study was to estimate the prevalence of infection with A. phagocytophilum in the wild boar population in southern Belgium. [less ▲]

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See detailMolecular Evidence That The Whitefly-Transmitted Sweetpotato Mild Mottle Virus Belongs To A Distinct Genus Of The Potyviridae
Colinet, Dominique; Kummert, Jean; Lepoivre, Philippe ULg

in Archives of Virology (1996), 141(1), 125-135

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See detailMolecular Evolution and Taxonomy of the Cyanobacteria
Wilmotte, Annick ULg

in Bryant, Donald A (Ed.) The Molecular Biology of Cyanobacteria (1994)

Molecular biology has provided new tools to decipher genetic information and can be used in attempts to reconstruct the evolution of organisms and improve their taxonomy. In the cyanobacteria, the use of ... [more ▼]

Molecular biology has provided new tools to decipher genetic information and can be used in attempts to reconstruct the evolution of organisms and improve their taxonomy. In the cyanobacteria, the use of molecular methods to study the genotypic relationships is underway, and initial results are promising. Different chemotaxonomic and macromolecular techniques are reviewed and their usefulness is evaluated. The most complete phylogenetic scheme of the cyanobacteria which is presently available is based on 16S rRNA sequence analysis. With this method, controversial taxonomic problems have been solved, such as the relationships among Pseudanabaena sp. strains or between the genera Arthrospira and Spirulina. In other cases, additional 16S rRNA sequences are necessary to obtain a clear picture. In addition to the cultivated strains, molecular ecology studies have contributed to the determination of new 16S rRNA sequence types, that have been retrieved directly from natural populations. The corresponding morphologies are presently unknown but may be revealed by the use of labeled probes annealing to specific 16S rRNA regions. For taxonomic purposes, it is necessary to find morphological features and simple testing methods which are congruent with the genotypic groupings. This information may be used to evaluate and revise existing classifications. The first stage in the development of such a polyphasic taxonomy is now underway. [less ▲]

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See detailMolecular evolution of the CYTH superfamily of proteins
Bettendorff, Lucien ULg; Delvaux, David ULg; Kohn, Grégory ULg et al

in FEBS Journal (2012), 279(Suppl. s1), 438

Molecular evolution of the CYTH superfamily of proteins L. Bettendorff, D. Delvaux, G. Kohn, P. Wins, B. Lakaye GIGA-Neurosciences, University of Liège, Belgium The CYTH superfamily of proteins was named ... [more ▼]

Molecular evolution of the CYTH superfamily of proteins L. Bettendorff, D. Delvaux, G. Kohn, P. Wins, B. Lakaye GIGA-Neurosciences, University of Liège, Belgium The CYTH superfamily of proteins was named after the two founding members, the CYaB adenylyl cyclase from Aeromonas hydrophila and the human 25-kDa THiamine triphosphatase (ThTPase). Members of this superfamily of proteins exist in all organisms including bacteria, archaea, plants and animals (except in birds) and can be traced back to the Last Universal Common Ancestor. They are characterized by a consensus sequence including several charged residues involved in divalent cation and triphosphate binding. Indeed, all members of the CYTH family that are characterized act on triphosphate derivatives and require at least one divalent cation for catalysis. The Nitrosomonas europaea (1) and E.coli CYTH proteins are specific inorganic triphosphatases. We propose that inorganic triphosphate (PPPi), the most simple triphosphate compound that can be imagined, is the primitive substrate of CYTH proteins. Other enzyme activities such as adenylate cyclase (in A. hydrophila), mRNA triphosphatase (in fungi and protozoans) and ThTPase (in metazoans) activities are secondary acquisitions. We show that ThTPase activity is not limited to mammals, but Sea anemone and Zebrafish CYTH proteins are already specific ThTPases and the acquisition of this enzyme activity is linked to the presence of a Trp (W53 in mammalian ThTPases) residue involved in the binding of the thiazole heterocycle of the thiamine molecule. The importance of W53 for the specificity of mammalian ThTPases is confirmed by site-directed mutagenesis. Furthermore, we propose a conserved catalytic mechanism between inorganic triphosphatases and ThTPases, based on a catalytic dyad comprising a Lys and a Tyr residue, explaining the alkaline pH optimum of CYTH proteins. (1) Delvaux et al. J. Biol. Chem 286 (2011) 34023-35 [less ▲]

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See detailMolecular Fluids and Mixtures
Kohler, F; Pfennig, Andreas ULg

in Pure and Applied Chemistry (1989), 61(6), 1041-1050

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See detailMolecular Fluids and Mixtures
Kohler, F; Pfennig, Andreas ULg

Conference (1988)

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