Search results for "A protein"

showing 5 items of 565 documents

Mtlinteracts with members of Egfr signaling and cell adhesion genes in the Drosophila eye

2011

Mtl is a member of the Rho family of small GTPases in Drosophila. It was shown that Mtl is involved in planar cell polarity (PCP) establishment, together with other members of the same family like Cdc42, Rac1, Rac2 and RhoA. However, while Rac1, Rac2 and RhoA function downstream of Dsh in Fz/PCP signaling and upstream of a JNK cassette, Mtl and Cdc42 do not. To determine the functional context of Mtl during PCP establishment in the Drosophila eye, we performed a loss-of-function screen to search for dominant modifiers of a sev>Mtl rough eye phenotype. In addition, genetic interaction assays with candidate genes were also carried out. Our results show that Mtl interacts genetically with memb…

rho GTP-Binding ProteinsGeneticsOmmatidial rotationRHOAbiologyCytoskeleton organizationCell PolarityCDC42Cell biologyErbB ReceptorsPhenotypeInsect ScienceCell polarityCell Adhesionbiology.proteinAnimalsDrosophila ProteinsImmunoglobulin superfamilyDrosophilaCompound Eye ArthropodReceptors Invertebrate PeptideCell adhesionpsychological phenomena and processesDrosophila ProteinSignal TransductionFly
researchProduct

The prolyl-isomerase PIN1 is essential for nuclear Lamin-B structure and function and protects heterochromatin under mechanical stress.

2021

Summary: Chromatin organization plays a crucial role in tissue homeostasis. Heterochromatin relaxation and consequent unscheduled mobilization of transposable elements (TEs) are emerging as key contributors of aging and aging-related pathologies, including Alzheimer’s disease (AD) and cancer. However, the mechanisms governing heterochromatin maintenance or its relaxation in pathological conditions remain poorly understood. Here we show that PIN1, the only phosphorylation-specific cis/trans prolyl isomerase, whose loss is associated with premature aging and AD, is essential to preserve heterochromatin. We demonstrate that this PIN1 function is conserved from Drosophila to humans and prevents…

transposonsNeocortexMiceHeterochromatinProlyl isomeraseDrosophila ProteinsBiology (General)PhosphorylationRNA Small InterferingTissue homeostasisCells CulturedSettore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniNeuronsLamin Type BChemistryHP1phosphorylationneurodegenerationnuclear envelopePeptidylprolyl IsomeraseCell biologyDrosophila heterochromatin HP1 Lamin mechanical stress neurodegeneration nuclear envelope phosphorylation PIN1 transposonsNuclear laminaDrosophilaRNA InterferencePremature agingQH301-705.5HeterochromatinNuclear EnvelopeDrosophila; heterochromatin; HP1; Lamin; mechanical stress; neurodegeneration; nuclear envelope; phosphorylation; PIN1; transposonsSettore BIO/11 - Biologia MolecolareSettore MED/08 - Anatomia PatologicaGeneral Biochemistry Genetics and Molecular BiologyPIN1Alzheimer DiseaseSettore MED/05 - Patologia ClinicaAnimalsHumansHeterochromatin maintenancemechanical stressheterochromatinmechanical streMice Inbred C57BLNIMA-Interacting Peptidylprolyl IsomeraseChromobox Protein Homolog 5DNA Transposable ElementsHeterochromatin protein 1Stress MechanicalLaminLaminCell reports
researchProduct

CVB3 VP1 interacts with MAT1 to inhibit cell proliferation by interfering with Cdk-activating kinase complex activity in CVB3-induced acute pancreati…

2021

Coxsackievirus B3 (CVB3) belongs to the genus Enterovirus of the family Picornaviridae and can cause acute acinar pancreatitis in adults. However, the molecular mechanisms of pathogenesis underlying CVB3-induced acute pancreatitis have remained unclear. In this study, we discovered that CVB3 capsid protein VP1 inhibited pancreatic cell proliferation and exerted strong cytopathic effects on HPAC cells. Through yeast two-hybrid, co-immunoprecipitation, and confocal microscopy, we show that Menage a trois 1 (MAT1), a subunit of the Cdk-Activating Kinase (CAK) complex involved in cell proliferation and transcription, is a novel interaction protein with CVB3 VP1. Moreover, CVB3 VP1 inhibited MAT…

virusesCultured tumor cellsSynthesis PhaseCell Cycle ProteinsBiochemistryCell Cycle and Cell DivisionBiology (General)PhosphorylationPost-Translational ModificationCyclin0303 health sciencesbiologyKinaseChemistry030302 biochemistry & molecular biologyRetinoblastoma proteinvirus diseasesCell DifferentiationTransfectionCyclin-Dependent KinasesCell biologyEnterovirus B HumanCell ProcessesPhosphorylationCell linesBiological culturesResearch ArticleQH301-705.5Protein subunitImmunologyCoxsackievirus InfectionsTransfectionResearch and Analysis MethodsMicrobiology03 medical and health sciencesVirologyCyclinsGeneticsHumansHeLa cellsMolecular Biology TechniquesMolecular Biology030304 developmental biologyCell ProliferationCell growthG1 PhaseBiology and Life SciencesProteinsCell Cycle CheckpointsCell BiologyRC581-607Cell culturesPancreatitisbiology.proteinParasitologyCapsid ProteinsImmunologic diseases. AllergyCyclin-dependent kinase 7Cyclin-Dependent Kinase-Activating KinaseTranscription FactorsPLoS pathogens
researchProduct

Nuclear localization but not PML protein is required for incorporation of the papillomavirus minor capsid protein L2 into virus-like particles.

2004

ABSTRACT Recent reports suggest that nuclear domain(s) 10 (ND10) is the site of papillomavirus morphogenesis. The viral genome replicates in or close to ND10. In addition, the minor capsid protein, L2, accumulates in these subnuclear structures and recruits the major capsid protein, L1. We have now used cell lines deficient for promyelocytic leukemia (PML) protein, the main structural component of ND10, to study the role of this nuclear protein for L2 incorporation into virus-like particles (VLPs). L2 expressed in PML protein knockout (PML −/− ) cells accumulated in nuclear dots, which resemble L2 aggregates forming at ND10 in PML protein-containing cells. These L2 assemblies also attracted…

virusesImmunologyActive Transport Cell NucleusNuclear dotsBiologyPromyelocytic Leukemia ProteinMicrobiologyCell LinePromyelocytic leukemia proteinMiceDeath-associated protein 6Virus-like particleVirologymedicineAnimalsHumansNuclear proteinPapillomaviridaeAdaptor Proteins Signal TransducingCell NucleusTumor Suppressor ProteinsStructure and AssemblyIntracellular Signaling Peptides and ProteinsVirionvirus diseasesNuclear ProteinsOncogene Proteins Viralbiochemical phenomena metabolism and nutritionMolecular biologyCell biologyNeoplasm ProteinsCell nucleusMicroscopy Electronmedicine.anatomical_structureInsect ScienceMutationbiology.proteinCapsid ProteinsNuclear transportCarrier ProteinsCo-Repressor ProteinsNuclear localization sequenceMolecular ChaperonesTranscription FactorsJournal of virology
researchProduct

The Extracellular δ-Domain is Essential for the Formation of CD81 Tetraspanin Webs

2014

AbstractCD81 is a ubiquitously expressed member of the tetraspanin family. It forms large molecular platforms, so-called tetraspanin webs that play physiological roles in a variety of cellular functions and are involved in viral and parasite infections. We have investigated which part of the CD81 molecule is required for the formation of domains in the cell membranes of T-cells and hepatocytes. Surprisingly, we find that large CD81 platforms assemble via the short extracellular δ-domain, independent from a strong primary partner binding and from weak interactions mediated by palmitoylation. The δ-domain is also essential for the platforms to function during viral entry. We propose that, ins…

virusesLipoylationBiophysicschemical and pharmacologic phenomenaPlasma protein bindingBiologyTetraspanin 28Jurkat CellsProtein structurePalmitoylationTetraspaninViral entryExtracellularHumansComputingMilieux_MISCELLANEOUS[PHYS]Physics [physics]MembranesHep G2 Cellsbiochemical phenomena metabolism and nutritionCell biologyProtein Structure TertiaryProtein MultimerizationProtein Processing Post-TranslationalFunction (biology)CD81Protein Binding
researchProduct