Search results for "rab3 GTP-Binding Proteins"

showing 4 items of 4 documents

Human R1441C LRRK2 regulates the synaptic vesicle proteome and phosphoproteome in a Drosophila model of Parkinson's disease

2016

International audience; Mutations in leucine-rich repeat kinase 2 (LRRK2) cause late-onset, autosomal dominant familial Parkinsons disease (PD) and variation at the LRRK2 locus contributes to the risk for idiopathic PD. LRRK2 can function as a protein kinase and mutations lead to increased kinase activity. To elucidate the pathophysiological mechanism of the R1441C mutation in the GTPase domain of LRRK2, we expressed human wild-type or R1441C LRRK2 in dopaminergic neurons of Drosophila and observe reduced locomotor activity, impaired survival and an age-dependent degeneration of dopaminergic neurons thereby creating a new PD-like model. To explore the function of LRRK2 variants in vivo, we …

0301 basic medicineProteomerab3 GTP-Binding Proteinsalpha-synucleindomainSyntaxin 1Interactomedopaminergic-neuronsAnimals Genetically Modifiedchemistry.chemical_compound0302 clinical medicinemicrotubule stabilityDrosophila ProteinsProtein Interaction MapsGenetics (clinical)LRRK2 GeneKinasephosphorylationBrainParkinson DiseaseArticlesGeneral Medicineautosomal-dominant parkinsonismLRRK2Drosophila melanogasterSynaptotagmin IProteomePhosphorylationSynaptic VesiclesNerve Tissue ProteinsBiologyLeucine-Rich Repeat Serine-Threonine Protein Kinase-203 medical and health sciencesGeneticsAnimalsHumansKinase activitygeneMolecular BiologyAlpha-synucleingtp-bindingDopaminergic Neuronsrepeat kinase 2Molecular biologyPhosphoric Monoester Hydrolasesnervous system diseasesDisease Models Animal030104 developmental biologyGene Expression Regulationchemistrymutation030217 neurology & neurosurgery[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology
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The RAB GTPase RAB18 modulates macroautophagy and proteostasis

2017

Macroautophagy is a conserved degradative pathway and its deterioration is linked to disturbances in cellular proteostasis and multiple diseases. Here, we show that the RAB GTPase RAB18 modulates autophagy in primary human fibroblasts. The knockdown of RAB18 results in a decreased autophagic activity, while its overexpression enhances the degradative pathway. Importantly, this function of RAB18 is dependent on RAB3GAP1 and RAB3GAP2, which might act as RAB GEFs and stimulate the activity of the RAB GTPase. Moreover, the knockdown of RAB18 deteriorates proteostasis and results in the intracellular accumulation of ubiquitinated degradation-prone proteins. Thus, the RAB GTPase RAB18 is a positi…

0301 basic medicineRecombinant Fusion Proteinsrab3 GTP-Binding ProteinsPrimary Cell CultureBiophysicsGTPaseBiochemistry03 medical and health sciencesUbiquitinGenes ReporterAutophagyHumansRNA Small InterferingMolecular BiologyGene knockdownbiologyProtein StabilityChemistryfungiAutophagyCell BiologyFibroblastsCell biologyLuminescent Proteins030104 developmental biologyProteostasisGene Expression Regulationrab GTP-Binding ProteinsProteolysisbiology.proteinCancer researchRabSignal transductionRAB18Signal TransductionBiochemical and Biophysical Research Communications
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RAB3GAP1 and RAB3GAP2 modulate basal and rapamycin-induced autophagy

2014

Macroautophagy is a degradative pathway that sequesters and transports cytosolic cargo in autophagosomes to lysosomes, and its deterioration affects intracellular proteostasis. Membrane dynamics accompanying autophagy are mostly elusive and depend on trafficking processes. RAB GTPase activating proteins (RABGAPs) are important factors for the coordination of cellular vesicle transport systems, and several TBC (TRE2-BUB2-CDC16) domain-containing RABGAPs are associated with autophagy. Employing C. elegans and human primary fibroblasts, we show that RAB3GAP1 and RAB3GAP2, which are components of the TBC domain-free RAB3GAP complex, influence protein aggregation and affect autophagy at basal an…

GTPase-activating proteinlipid dropletsrab3 GTP-Binding ProteinsATG16L1DMSO dimethyl sulfoxideFEZ20302 clinical medicineATG autophagy-relatedPhagosomesDAPI 4’ 6-diamidino-2-phenylindoleSQSTM1 sequestosome 1ATG16L1MAP1LC3 microtubule-associated protein 1 light chain 3GFP green fluorescent protein0303 health sciencesGABARAP GABA(A) receptor-associated proteinGTPase-Activating ProteinsCell biologyRAB3GAP1RAB3GAP2RABGAP RAB GTPase activating proteinATG3autophagyCALCOCO2 calcium binding and coiled-coil domain 2Basic Research PaperseV empty vectorATG8ATG5PBS phosphate-buffered salineBiologyPE phosphatidylethanolamineTBC domain TRE2-BUB2-CDC16 domainBAG3GEF guanine nucleotide exchange factor03 medical and health sciencesC. elegans Caenorhabditis elegansAnimalsHumansCaenorhabditis elegansMolecular Biology030304 developmental biologySirolimusDPH 1 6-diphenyl-1 3 5-hexatrieneproteostasisAutophagyBiological TransportCell BiologyFEZ1Bafi bafilomycin A1FEZ fasciculation and elongation protein zetaNBR1 neighbor of BRCA1 gene 1ProteostasissiRNA small interfering RNABSA bovine serum albuminRabLysosomes030217 neurology & neurosurgeryAutophagy
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RAB18 Loss Interferes With Lipid Droplet Catabolism and Provokes Autophagy Network Adaptations

2020

Autophagy is dependent on appropriate lipid supply for autophagosome formation. The regulation of lipid acquisition and the autophagy network response to lipid-limiting conditions are mostly elusive. Here, we show that the knockout of the RAB GTPase RAB18 interferes with lipid droplet catabolism, causing an impaired fatty acid release. The resulting reduced lipid-droplet-derived lipid availability influences autophagy and provokes adaptive modifications of the autophagy network. These adjustments include increased expression and phosphorylation of ATG2B as well as augmented formation of the ATG12-ATG5 conjugate. Moreover, ATG9A shows an enhanced phosphorylation at amino acid residues tyrosi…

rab3 GTP-Binding ProteinsImmunoblottingGTPaseReal-Time Polymerase Chain Reaction03 medical and health sciences0302 clinical medicineMicroscopy Electron TransmissionStructural BiologyLipid dropletAutophagyHumansPhosphorylationTyrosineMolecular Biology030304 developmental biology0303 health sciencesMicroscopy ConfocalChemistryCatabolismAutophagyAutophagosomesLipid DropletsImmunohistochemistryCell biologyrab GTP-Binding ProteinsPhosphorylationlipids (amino acids peptides and proteins)RabCRISPR-Cas Systems030217 neurology & neurosurgeryRAB18HeLa CellsJournal of Molecular Biology
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