Search results for " Regulation"

showing 10 items of 3187 documents

CitA/CitB Two-Component System Regulating Citrate Fermentation in Escherichia coli and Its Relation to the DcuS/DcuR System In Vivo

2011

ABSTRACT Citrate fermentation by Escherichia coli requires the function of the citrate/succinate antiporter CitT ( citT gene) and of citrate lyase ( citCDEFXG genes). Earlier experiments suggested that the two-component system CitA/CitB, consisting of the membrane-bound sensor kinase CitA and the response regulator CitB, stimulates the expression of the genes in the presence of citrate, similarly to CitA/CitB of Klebsiella pneumoniae . In this study, the expression of a chromosomal citC-lacZ gene fusion was shown to depend on CitA/CitB and citrate. CitA/CitB is related to the DcuS/DcuR two-component system which induces the expression of genes for fumarate respiration in response to C 4 -di…

ATP citrate lyaseOperonBiologymedicine.disease_causeMicrobiologyCitric AcidFusion geneGene clusterEscherichia colimedicinePromoter Regions GeneticMolecular BiologyEscherichia coliEscherichia coli ProteinsPromoterGene Expression Regulation BacterialArticlesMolecular biologyTwo-component regulatory systemDNA-Binding ProteinsResponse regulatorBiochemistryFermentationProtein KinasesProtein BindingTranscription FactorsJournal of Bacteriology
researchProduct

Genetic organization of the citCDEF locus and identification of mae and clyR genes from Leuconostoc mesenteroides.

1999

ABSTRACT In this paper, we describe two open reading frames coding for a NAD-dependent malic enzyme ( mae ) and a putative regulatory protein ( clyR ) found in the upstream region of citCDEFG of Leuconostoc mesenteroides subsp. cremoris 195. The transcriptional analysis of the citrate lyase locus revealed one polycistronic mRNA covering the mae and citCDEF genes. This transcript was detected only on RNA prepared from cells grown in the presence of citrate. Primer extension experiments suggest that clyR and the citrate lyase operon are expressed from a bidirectional A-T-rich promoter region located between mae and clyR.

ATP citrate lyaseTranscription GeneticOperonMolecular Sequence DataMalatesLocus (genetics)Genetics and Molecular BiologyBiologyMicrobiologyPrimer extensionCitric AcidOpen Reading FramesBacterial ProteinsMalate DehydrogenaseMultienzyme ComplexesLeuconostocAmino Acid SequenceMolecular BiologyGeneGeneticsBase SequenceOxo-Acid-LyasesPromoterGene Expression Regulation BacterialSequence Analysis DNAbiology.organism_classificationMolecular biologyLeuconostoc mesenteroidesGenes BacterialSequence AlignmentLeuconostocJournal of bacteriology
researchProduct

Cytotoxicity of cucurbitacin E from Citrullus colocynthis against multidrug-resistant cancer cells

2019

Abstract Background Cucurbitacin E (CuE) is an oxygenated tetracyclic triterpenoid isolated from the fruits of Citrullus colocynthis (L.) Schrad. Purpose This study outlines CuE's cytotoxic activity against drug-resistant tumor cell lines. Three members of ABC transporters superfamily, P-glycoprotein (P-gp), breast cancer resistance protein (BCRP) and ABCB5 were investigated, whose overexpression in tumors is tightly linked to multidrug resistance. Further factors of drug resistance studied were the tumor suppressor TP53 and the epidermal growth factor receptor (EGFR). Methods Cytotoxicity assays (resazurin assays) were used to investigate the activity of Citrullus colocynthis and CuE towar…

Abcg2Drug ResistancePharmaceutical ScienceATP-binding cassette transporterMicroarraySubfamily Gchemistry.chemical_compoundGene Knockout Techniques0302 clinical medicineEpidermal growth factorPhytogenicDrug DiscoveryATP Binding Cassette Transporter Subfamily G Member 2Cancer0303 health sciencesTumorLeukemiabiologyChemistryABCB5TransfectionCell cycleNeoplasm ProteinsGene Expression Regulation NeoplasticErbB ReceptorsMolecular Docking SimulationSubfamily B030220 oncology & carcinogenesisMolecular MedicineCitrullus colocynthiMember 2Member 1ATP Binding Cassette Transporter Subfamily BATP Binding Cassette TransporterAntineoplastic AgentsCell Line03 medical and health sciencesCell Line TumorHumansATP Binding Cassette Transporter Subfamily B Member 1030304 developmental biologyCucurbitacin EPharmacologyNeoplasticTraditional herbal medicineCancer; Citrullus colocynthis; Drug resistance; Microarray; Traditional herbal medicine; ATP Binding Cassette Transporter Subfamily B; ATP Binding Cassette Transporter Subfamily B Member 1; ATP Binding Cassette Transporter Subfamily G Member 2; Antineoplastic Agents Phytogenic; Cell Line Tumor; Citrullus colocynthis; Doxorubicin; Drug Resistance Neoplasm; ErbB Receptors; Gene Expression Regulation Neoplastic; Gene Knockout Techniques; Humans; Leukemia; Molecular Docking Simulation; Neoplasm Proteins; Triterpenes; Tumor Suppressor Protein p53Antineoplastic Agents PhytogenicTriterpenesComplementary and alternative medicineGene Expression RegulationDrug Resistance NeoplasmDoxorubicinCancer cellbiology.proteinCancer researchNeoplasmCitrullus colocynthisTumor Suppressor Protein p53
researchProduct

Polyamines in Developing Stress-Resistant Crops

2012

F.Marco,R.Alcazar,T.Altabella,P.Carrasco,SarvajeetSinghGill,NarendraTuteja,andA.F. TiburcioPolyamines (PAs) are small protonated compounds with key roles in plant devel-opmentandphysiologicalprocesses.PAsmayalsofunctionasstressmessengersinplant responses to different stress signals. Recent studies using exogenous appli-cation of polyamines and more contemporary genetic manipulation of polyaminelevelsincropsandmodelspeciespointtotheirinvolvementinstressprotection.Thedifferentmechanismsbywhichpolyaminesexerttheirfunctionsarepresentlybeingunraveledandinvolvedifferentmodesofactionthataresummarizedinthischapter.Polyamines are integrated with other stress-related hormone pathways, such asabscisic…

Abiotic componentSalinityTranscriptomechemistry.chemical_compoundchemistryCatabolismBotanyTranscriptional regulationGenetically modified cropsBiologyMode of actionAbscisic acid
researchProduct

Ricerche in tema di società questuarie

2019

Intorno al regime delle società di tipo questuario – riconducibili agli schemi teorici della societas universorum quae ex quaestu veniunt – e delle società unius alicuius negotiationis e unius rei, si profusero gli sforzi interpretativi dei giuristi romani, fin dalla fine dell’età repubblicana. La monografia scientifica ripercorre le tracce della individuazione della nozione stessa di quaestus (guadagno), con particolare riferimento alla inclusione al suo interno delle donazioni cd. remuneratorie; ancora, ricostruisce il dibattito giurisprudenziale sorto intorno alla questione se i soci – nella determinazione delle quote – dovessero rispettare una proporzione rispetto ai conferimenti, con u…

About the regulations of the societas quaestus - referable to the societas universorum quae ex quaestu veniunt and to the societas unius alicuius negotiationis and unius rei - the interpretative efforts of the Roman jurists were given profusely since the end of the republican age. The scientific monograph puts itself on the traces of identifying the notion of quaestus (gain) with particular reference to the inclusion within it of the so-called remuneration gifts. Furthermore it reconstructs the jurisprudential debate that aroses around the question of whether the socii - in the determination of the shares - had to respect a proportion with the contributions and in this sense with an attempt to explain the existing contrast between a passage from the Digest and one of the Iustiniani Institutiones. Moreover always with specific reference to the societas quaestus the monograph investigates the setting-up of the intempestiva renuntiatio supporting its origin out of the contrast between Proculiani and Sabiniani so far postulated in doctrine. Finally the book closes with a chapter dedicated to the genesis of the term egestas which appears in a fragment of Modestinus (D. 17.2.4.1) dedicated to the causes of dissolution of the societas consensu contractaSettore IUS/18 - Diritto Romano E Diritti Dell'Antichita'
researchProduct

Absorptive Capacity and Social Capital: Innovation and Environmental Regulation

2010

Norwegian paper and pulp mills are subject to strict environmental regulation. The mills conduct research and development for reducing pollution. Absorptive capacity indicates their competence. Firms are part of a social network of connections with external actors that include other paper and pulp mills, suppliers, customers, research institutes, and universities that help them in developing technologies. These relations represent their social capital. Some firms have access to more and better resources than other firms. Measuring firms’ absorptive capacity and access to social capital, we analyze their success in reducing pollution levels. There is a strong interaction effect between absor…

Absorptive capacityEconomic capitalEnvironmental regulationBusinessEconomic systemCompetence (human resources)Industrial organizationSocial capital
researchProduct

Diverse stress signals activate the C1 subgroup MAP kinases ofArabidopsis

2007

AbstractMitogen-activated protein kinase (MAPK) cascades play an important role in mediating stress responses in plants. In Arabidopsis, 20 MAPKs have been identified and classified into four major groups (A–D). Little is known about the role of group C MAPKs. We have studied the activation of Arabidopsis subgroup C1 MAPKs (AtMPK1/AtMPK2) in response to mechanical injury. An increase in their kinase activity was detected in response to wounding that was blocked by cycloheximide. Jasmonic acid (JA) activated AtMPK1/AtMPK2 in the absence of wounding. Wound and JA-induction of AtMPK1/2 kinase activity was not prevented in the JA-insensitive coi1 mutant. Other stress signals, such as abscisic a…

AcclimatizationArabidopsisBiophysicsBiochemistryGene Expression Regulation Enzymologicchemistry.chemical_compoundGene Expression Regulation PlantStructural BiologyArabidopsisGeneticsASK1Kinase activityProtein kinase AMolecular BiologyJasmonic acidMAP kinase kinase kinasebiologyArabidopsis ProteinsKinaseJasmonic acidWoundHydrogen PeroxideCell Biologybiology.organism_classificationBiochemistrychemistryMitogen-activated protein kinasebiology.proteinMAP kinaseStress MechanicalMitogen-Activated Protein KinasesAbscisic AcidSignal TransductionFEBS Letters
researchProduct

Integration of polyamins in the cold acclimation response

2011

8 páginas, 1 figura, 3 tablas -- PAGS nros. 31-38

AcclimatizationPlant geneticsArabidopsisCold acclimationPlant ScienceBiologyModels BiologicalTranscriptomechemistry.chemical_compoundAbscisic acidMetabolomicsGene Expression Regulation PlantBotanyGeneticsCold acclimationPolyaminesAbscisic acidRegulation of gene expressionEcologyPlant physiologyGeneral MedicineCold TemperatureArginine decarboxylasechemistryAdaptationAgronomy and Crop Science
researchProduct

Isoquercitrin and polyphosphate co-enhance mineralization of human osteoblast-like SaOS-2 cells via separate activation of two RUNX2 cofactors AFT6 a…

2014

Isoquercitrin, a dietary phytoestrogen, is a potential stimulator of bone mineralization used for prophylaxis of osteoporotic disorders. Here we studied the combined effects of isoquercitrin, a cell membrane permeable 3-O-glucoside of quercetin, and polyphosphate [polyP], a naturally occurring inorganic polymer inducing bone formation, on mineralization of human osteoblast-like SaOS-2 cells. Both compounds isoquercitrin and polyP induce at non-toxic concentrations the mineralization process of SaOS-2 cells. Co-incubation experiments revealed that isoquercitrin (at 0.1 and 0.3μM), if given simultaneously with polyP (as Ca(2+) salt; at 3, 10, 30 and 100μM) amplifies the mineralization-enhanci…

Activating transcription factorBiochemistryProto-Oncogene Protein c-ets-103 medical and health sciences0302 clinical medicineCalcification PhysiologicPolyphosphatesCell Line TumormedicineHumansSaos-2 cells030304 developmental biologyPharmacology0303 health sciencesOsteoblastsbiologyATF6OsteoblastDrug SynergismActivating Transcription Factor 6RUNX2medicine.anatomical_structureBiochemistryGene Expression Regulation030220 oncology & carcinogenesisOsteocalcinbiology.proteinAlkaline phosphataseCalciumQuercetinSignal transductionBiochemical pharmacology
researchProduct

Mobile Phone Data Statistics as Proxy Indicator for Regional Economic Activity Assessment

2019

The mobile data analysis is an authoritative source of information for problems solving in the fields of human activity recognition, population dynamics, tourism, transport planning, traffics measuring, public administration and other activities and could be the source for valuable information as a proxy indicator. One of the obstacles to user data from mobile operators is compliance to the General Data Protection Regulation, so the development of data analytics approach that protects personal data without a necessity to identify mobility of particular persons was developed, that still provides economically relevant data. In the present research, the method for the economic activity assessm…

Activity recognitionBase stationeducation.field_of_studyShort Message ServiceMobile phoneComputer scienceGeneral Data Protection RegulationMobile broadbandStatisticsPopulationData analysiseducationInternational Conference on Finance, Economics, Management and IT Business
researchProduct