Search results for "Heterotrimeric GTP-Binding Proteins"

showing 4 items of 4 documents

Mutation spectrum and clinical investigation of achromatopsia patients with mutations in the GNAT2 gene

2019

Achromatopsia (ACHM) is a hereditary cone photoreceptor disorder characterized by the inability to discriminate colors, nystagmus, photophobia, and low-visual acuity. Six genes have been associated with this rare autosomal recessively inherited disease, including the GNAT2 gene encoding the catalytic α-subunit of the G-protein transducin which is expressed in the cone photoreceptor outer segment. Out of a cohort of 1,116 independent families diagnosed with a primary clinical diagnosis of ACHM, we identified 23 patients with ACHM from 19 independent families with likely causative mutations in GNAT2, representing 1.7% of our large ACHM cohort. In total 22 different potentially disease-causing…

AdultMaleAchromatopsiagenetic structuresAdolescentChild preschoolDNA Copy Number VariationsColor Vision DefectsBiologymedicine.disease_causeHeterotrimeric GTP-Binding Proteins/genetics03 medical and health sciencesExonGene duplicationGeneticsmedicineHumansGenetic Predisposition to DiseaseCopy-number variationColor Vision Defects/geneticsChildGenetics (clinical)030304 developmental biologyAgedGenetics0303 health sciencesGNAT2MutationSettore MED/30 - Malattie Apparato Visivo030305 genetics & heredityBreakpointInfantSequence Analysis DNAExonsMiddle Agedmedicine.diseaseHeterotrimeric GTP-Binding ProteinsPhotoreceptor outer segmenteye diseasesPedigreeSettore BIO/18 - GeneticaSequence Analysis DNA/methodsyoung adultFemalesense organsachromatopsia copy number variations GNAT2 mutations transducinmutation
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Calcium-Dependent Assembly of Centrin-G-Protein Complex in Photoreceptor Cells

2002

Photoexcitation of rhodopsin activates a heterotrimeric G-protein cascade leading to cyclic GMP hydrolysis in vertebrate photoreceptors. Light-induced exchanges of the visual G-protein transducin between the outer and inner segment of rod photoreceptors occur through the narrow connecting cilium. Here we demonstrate that transducin colocalizes with the Ca(2+)-binding protein centrin 1 in a specific domain of this cilium. Coimmunoprecipitation, centrifugation, centrin overlay, size exclusion chromatography, and kinetic light-scattering experiments indicate that Ca(2+)-activated centrin 1 binds with high affinity and specificity to transducin. The assembly of centrin-G-protein complex is medi…

Lightgenetic structuresChromosomal Proteins Non-HistoneMacromolecular SubstancesImmunoprecipitationG proteinCentrifugationPlasma protein bindingBiologyRetinaSubstrate SpecificityRats Sprague-DawleyMiceHeterotrimeric G proteinCalcium-binding proteinAnimalsScattering RadiationTransducinMicroscopy ImmunoelectronCell Growth and DevelopmentMolecular BiologyCalcium-Binding ProteinsCell BiologyHeterotrimeric GTP-Binding ProteinsPrecipitin TestsRatsCell biologyMice Inbred C57BLMolecular WeightRhodopsinCentrinChromatography Gelbiology.proteinCalciumCattlesense organsTransducinPhotoreceptor Cells VertebrateProtein BindingSignal TransductionMolecular and Cellular Biology
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Coupling of endothelin receptors to the ERK/MAP kinase pathway. Roles of palmitoylation and G(alpha)q.

2001

Endothelins are potent mitogens that stimulate extracellular signal-regulated kinases (ERK/MAP kinases) through their cognate G-protein-coupled receptors, ET(A) and ET(B). To address the role of post-translational ET receptor modifications such as acylation on ERK activation and to identify relevant downstream effectors coupling the ET receptor to the ERK signaling cascades we have constructed a panel of palmitoylation-deficient ET receptor mutants with differential G(alpha) protein binding capacity. Endothelin-1 stimulation of wild-type ET(A) or ET(B) induced a fivefold to sixfold increase in ERK in COS-7 and CHO cells whereas full-length nonpalmitoylated ET(A) and ET(B) mutants failed to …

MAPK/ERK pathwayGs alpha subunitInsectaMAP Kinase Signaling SystemBlotting WesternMolecular Sequence DataPalmitic AcidSRC Family Tyrosine KinaseBiochemistryCell LineCricetinaeArrestinTumor Cells CulturedAnimalsHumansAmino Acid SequenceReceptorMitogen-Activated Protein Kinase 1KinaseChemistryReceptors EndothelinCell MembraneHeterotrimeric GTP-Binding ProteinsCell biologyEnzyme ActivationErbB ReceptorsType C PhospholipasesCOS CellsMutationcardiovascular systemMutagenesis Site-DirectedPhosphorylationGTP-Binding Protein alpha Subunits Gq-G11Mitogen-Activated Protein KinasesProto-oncogene tyrosine-protein kinase SrcEuropean journal of biochemistry
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Cryptochrome in Sponges: A Key Molecule Linking Photoreception with Phototransduction

2013

Sponges (phylum: Porifera) react to external light or mechanical signals with contractile or metabolic reactions and are devoid of any nervous or muscular system. Furthermore, elements of a photoreception/phototransduction system exist in those animals. Recently, a cryptochrome-based photoreceptor system has been discovered in the demosponge. The assumption that in sponges the siliceous skeleton acts as a substitution for the lack of a nervous system and allows light signals to be transmitted through its glass fiber network is supported by the findings that the first spicules are efficient light waveguides and the second sponges have the enzymatic machinery for the generation of light. Now…

Nervous systemHistologyLight Signal TransductionMolecular Sequence DataNitric Oxide03 medical and health sciences0302 clinical medicineDemospongeCryptochromeCell MovementmedicineAnimalsAmino Acid SequenceTransducinCloning Molecular030304 developmental biology0303 health sciencesbiologyArticlesbiology.organism_classificationHeterotrimeric GTP-Binding ProteinsCell biologySuberites domunculaCryptochromesSpongemedicine.anatomical_structureBiochemistryTransducinAnatomyNitric Oxide SynthaseCarrier ProteinsSuberitesSequence Alignment030217 neurology & neurosurgerySuberitesVisual phototransduction
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