Search results for "beta-Lactam"

showing 5 items of 105 documents

ElaC Encodes a Novel Binuclear Zinc Phosphodiesterase

2002

ElaC is a widespread gene found in eubacteria, archaebacteria, and mammals with a highly conserved sequence. Two human ElaC variants were recently associated with cancer (Tavtigian, S. V., Simard, J., Teng, D. H., Abtin, V., Baumgard, M., Beck, A., Camp, N. J., Carillo, A. R., Chen, Y., Dayananth, P., Desrochers, M., Dumont, M., Farnham, J. M., Frank, D., Frye, C., Ghaffari, S., Gupte, J. S., Hu, R., Iliev, D., Janecki, T., Kort, E. N., Laity, K. E., Leavitt, A., Leblanc, G., McArthur-Morrison, J., Pederson, A., Penn, B., Peterson, K. T., Reid, J. E., Richards, S., Schroeder, M., Smith, R., Snyder, S. C., Swedlund, B., Swensen, J., Thomas, A., Tranchant, M., Woodland, A. M., Labrie, F., Sko…

chemistry.chemical_elementZincBiologymedicine.disease_causeBiochemistrybeta-LactamasesHomology (biology)Conserved sequenceGene productEscherichia colimedicineHistidineCloning MolecularBinding siteMolecular BiologyEscherichia coliHistidineCell NucleusIonsBinding SitesModels StatisticalPhosphoric Diester HydrolasesSpectrum AnalysisX-RaysPhosphodiesteraseCell BiologyProtein Structure TertiaryOxygenKineticsZincBiochemistrychemistryChromatography GelProtonsDimerizationProtein BindingJournal of Biological Chemistry
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Multiple Resistance to Betalactam Antibiotics, Azithromycin or Moxifloxacin in Implant Associated Bacteria

2013

Background Antibiotics are more and more frequently prescribed in dentistry for prevention and treatment of oral diseases. Bacterial resistance to these agents is clearly increasing, including even previously susceptible micro-organisms and true pathogens. The aim of the present investigation was to examine resistant bacterial strains with respect to possible multiple antibiotic resistance. Methods In a previous investigation, implant-associated bacteria were tested first as mixed cultures and again as pure isolates (n = 138) for resistance to one of five antibiotics (ampicillin/AM, ampicillin + sulbactam/AB, azithromycin/AZ, penicillin/PG, moxifloxacin/MX) using the Etest. The resistance o…

medicine.drug_classMoxifloxacinAntibioticsMicrobial Sensitivity TestsDrug resistanceAzithromycinbeta-LactamsGeneral Biochemistry Genetics and Molecular BiologyMicrobiologyAntibiotic resistanceMoxifloxacinAmpicillinmedicineHumansEtestDental ImplantsAza CompoundsBacteriabusiness.industryDrug Resistance MicrobialSulbactamDrug Resistance MultiplePenicillinQuinolinesbusinessFluoroquinolonesmedicine.drugClinical Laboratory
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Case-specific performance of MM-PBSA, MM-GBSA, and SIE in virtual screening.

2015

In drug discovery the reliable prediction of binding free energies is of crucial importance. Methods that combine molecular mechanics force fields with continuum solvent models have become popular because of their high accuracy and relatively good computational efficiency. In this research we studied the performance of molecular mechanics generalized Born surface area (MM-GBSA), molecular mechanics Poisson-Boltzmann surface area (MM-PBSA), and solvated interaction energy (SIE) both in their virtual screening efficiency and their ability to predict experimentally determined binding affinities for five different protein targets. The protein-ligand complexes were derived with two different app…

molecular mechanics generalized Born surface areaPhosphodiesterase InhibitorsMolecular Dynamics Simulationta3111Molecular mechanicsMolecular Docking Simulationbeta-LactamasesMolecular dynamicssolvated interaction energyBacterial ProteinsComputational chemistryAldehyde ReductaseDrug DiscoveryMaterials ChemistryHumansHSP90 Heat-Shock ProteinsPhysical and Theoretical ChemistryBeta-Lactamase InhibitorsSpectroscopymolecular mechanics Poisson-Boltzmann surface areaMM-GBSAVirtual screeningBinding SitesChemistryPhosphoric Diester Hydrolasesta1182Hydrogen BondingInteraction energyvirtual screeningComputer Graphics and Computer-Aided DesignMolecular Docking SimulationMM-PBSAModels ChemicalROC CurveSolvent modelsDocking (molecular)Area Under CurveBiological systemReceptors Progesteronebeta-Lactamase InhibitorsHydrophobic and Hydrophilic InteractionsProtein BindingJournal of molecular graphicsmodelling
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Double copies of blaKPC-3::Tn4401a on an IncX3 plasmid in Klebsiella pneumoniae successful clone ST512 from Italy

2015

ABSTRACT A carbapenem-resistant sequence type 512 (ST512) Klebsiella pneumoniae carbapenemase 3 (KPC-3)-producing K. pneumoniae strain showing a novel variant plasmid content was isolated in Palermo, Italy, in 2014. ST512 is a worldwide successful clone associated with the spread of bla KPC genes located on the IncFIIk pKpQIL plasmid. In our ST512 strain, the bla KPC-3 gene was unusually located on an IncX3 plasmid, whose complete sequence was determined. Two copies of bla KPC-3 ::Tn 4401a caused by intramolecular transposition events were detected in the plasmid.

transposonsequence analysispolymerase chain reactionDrug ResistanceGene DosageSettore MED/42 - Igiene Generale E Applicatabacterial proteinbeta-Lactamaseopen reading framecarbapenemasePlasmidminocyclineplasmid DNAmeropenemPharmacology (medical)geneticscolistincefpodoximeceftazidime610 Medicine & healthCarbapenemBacterialpolymyxin Btimentingene expression regulationbacteriumKlebsiella pneumoniae carbapenemase 3 producing Klebsiella pneumoniae3. Good healthantiinfective agentmicrobial sensitivity testKlebsiella pneumoniaeItalypriority journaltigecyclineMultipleclone (Java method)cefotaxime030106 microbiologyKlebsiella pneumoniae carbapenemase 3tobramycinMicrobial Sensitivity Testsgentamicinpiperacillin plus tazobactamchemistryGene dosageArticleMicrobiology03 medical and health sciencesComplete sequenceClone CellOpen Reading FramesertapenemBacterial Proteinsmultidrug resistanceextensively drug resistant bacteriumAnti-Bacterial AgentcefepimePharmacologylevofloxacinmicrobiologycefoxitinbiochemical phenomena metabolism and nutritionbacterial infections and mycosesVirologyAnti-Bacterial Agents; Bacterial Proteins; Carbapenems; Clone Cells; Drug Resistance Multiple Bacterial; Gene Dosage; Italy; Klebsiella Infections; Klebsiella pneumoniae; Microbial Sensitivity Tests; Open Reading Frames; Plasmids; beta-Lactamases; DNA Transposable Elements; Gene Expression Regulation Bacterial; Pharmacology (medical); Pharmacology; Infectious Diseasesantibiotic sensitivityClone CellsKlebsiella InfectionsceftriaxoneCarbapenemsbacterial genetics0301 basic medicinemolecular cloningSettore MED/07 - Microbiologia E Microbiologia ClinicaKlebsiella pneumoniaeTransposition (music)Drug Resistance Multiple Bacterialpolycyclic compoundsgenetic screeningcell clonecarbapenem derivativeKlebsiella infectionunclassified drugAnti-Bacterial AgentsInfectious Diseasesbacterial genePlasmidsenzymologydoripenemBiologyminimum inhibitory concentrationbeta-Lactamasesbeta lactamaseMechanisms of ResistanceciprofloxacinAmikacin; aztreonam; carbapenemase; cefepime; cefotaxime; cefoxitin; cefpodoxime; ceftazidime; ceftriaxone; ciprofloxacin; colistin; cotrimoxazole; doripenem; doxycycline; ertapenem; gentamicin; imipenem; Klebsiella pneumoniae carbapenemase 3; levofloxacin; meropenem; minocycline; piperacillin plus tazobactam; plasmid DNA; polymyxin B; tigecycline; timentin; tobramycin; unclassified drug; antiinfective agent; bacterial protein; beta lactamase; carbapenem derivative; transposon antibiotic sensitivity; Article; bacterial gene; bacterial genetics; bacterial strain; bacterium; bacterium detection; bacterium isolation; Escherichia coli; extensively drug resistant bacterium; gene dosage; genetic screening; Italy; Klebsiella pneumoniae; Klebsiella pneumoniae carbapenemase 3 producing Klebsiella pneumoniae; minimum inhibitory concentration; molecular cloning; nonhuman; polymerase chain reaction; priority journal; sequence analysis; cell clone; chemistry; drug effects; enzymology; gene expression regulation; genetics; isolation and purification; Klebsiella infection; Klebsiella pneumoniae; metabolism; microbial sensitivity test; microbiology; multidrug resistance; open reading frame; plasmid; transposon Anti-Bacterial Agents; Bacterial Proteins; beta-Lactamases; Carbapenems; Clone Cells; DNA Transposable Elements; Drug Resistance Multiple Bacterial; Gene Dosage; Gene Expression Regulation Bacterial; Italy; Klebsiella Infections; Klebsiella pneumoniae; Microbial Sensitivity Tests; Open Reading Frames; Plasmidsplasmidbacterium isolationEscherichia coliGeneAmikacinbacterium detectionnonhumandoxycyclineisolation and purificationGene Expression Regulation Bacterialbiology.organism_classificationbacterial straincotrimoxazoleOpen reading frameDNA Transposable Elementdrug effectsDNA Transposable Elementsmetabolismaztreonamimipenem
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Systematic Comparison of Epidemic and Non-Epidemic Carbapenem Resistant Klebsiella pneumoniae Strains

2021

Over the past few decades, extensively drug resistant (XDR) resistant Klebsiella pneumoniae has become a notable burden to healthcare all over the world. Especially carbapenemase-producing strains are problematic due to their capability to withstand even last resort antibiotics. Some sequence types (STs) of K. pneumoniae are significantly more prevalent in hospital settings in comparison to other equally resistant strains. This provokes the question whether or not there are phenotypic characteristics that may render certain K. pneumoniae more suitable for epidemic dispersal between patients, hospitals, and different environments. In this study, we selected seven epidemic and non-epidemic ca…

virulenceantibiotic resistanceextended-spectrum beta-lactamaselcsh:QR1-502XDR Klebsiella pneumoniaeepidemiclcsh:MicrobiologyFrontiers in Cellular and Infection Microbiology
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