0000000000247745

AUTHOR

Sebastian Rausch

showing 3 related works from this author

Light-dependent CK2-mediated phosphorylation of centrins regulates complex formation with visual G-protein.

2008

AbstractCentrins are Ca2+-binding EF-hand proteins. All four known centrin isoforms are expressed in the ciliary apparatus of photoreceptor cells. Cen1p and Cen2p bind to the visual G-protein transducin in a strictly Ca2+-dependent way, which is thought to regulate light driven movements of transducin between photoreceptor cell compartments. These relatively slow motile processes represent a novel paradigm in light adaptation of photoreceptor cells.Here we validated specific phosphorylation as a novel regulator of centrins in photoreceptors. Centrins were differentially phosphorylated during photoreceptor dark adaptation. Inhibitor treatments revealed protein kinase CK2 as the major protein…

genetic structuresLightG proteinVisionChromosomal Proteins Non-HistoneBlotting WesternDark AdaptationBiologySignal transductionMicrotubulesPhotoreceptor cellMass SpectrometryCa2+-binding proteinsSubstrate SpecificityRats Sprague-DawleyMiceHeterotrimeric G proteinmedicineAnimalsCiliaTransducinPhosphorylationProtein kinase ACasein Kinase IIFluorescent Antibody Technique IndirectMicroscopy ImmunoelectronMolecular BiologyCytoskeletonCiliumCalcium-Binding ProteinsCell BiologyCell biologyRatsMice Inbred C57BLmedicine.anatomical_structureCentrinPhosphorylationHeterotrimeric G-proteinCalciumCattleTransducinsense organsMolecular translocationPhotoreceptor Cells VertebrateProtein BindingBiochimica et biophysica acta
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Insights into functional aspects of centrins from the structure of N-terminally extended mouse centrin 1

2006

AbstractCentrins are members of the family of Ca2+-binding EF-hand proteins. In photoreceptor cells, centrin isoform 1 is specifically localized in the non-motile cilium. This connecting cilium links the light-sensitive outer segment with the biosynthetic active inner segment of the photoreceptor cell. All intracellular exchanges between these compartments have to occur through this cilium. Three-dimensional structures of centrins from diverse organisms are known, showing that the EF-hand motifs of the N-terminal domains adopt closed conformations, while the C-terminal EF-hand motifs have open conformations. The crystal structure of an N-terminally extended mouse centrin 1 (MmCen1-L) resemb…

Protein ConformationAmino Acid MotifsSequence HomologyPlasma protein bindingEF-handTroponin CMiceStructure-Activity RelationshipProtein structureCalcium-binding proteinConnecting ciliumCentrinAnimalsHumansPhotoreceptor CellsCiliaEF Hand MotifsProtein Structure QuaternaryChemistryEF handCiliumCalcium-Binding ProteinsTerminal Repeat SequencesCalcium-binding proteinSensory SystemsProtein Structure TertiaryCell biologyOphthalmologyCentrinCalciumTransducinsense organsX-ray structureProtein BindingVision Research
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Centrins, gatekeepers for the light-dependent translocation of transducin through the photoreceptor cell connecting cilium

2006

Centrins are members of a highly conserved subgroup of the EF-hand superfamily of Ca(2+)-binding proteins commonly associated with centrosome-related structures. In the retina, centrins are also prominent components of the photoreceptor cell ciliary apparatus. Centrin isoforms are differentially localized at the basal body and in the lumen of the connecting cilium. All molecular exchanges between the inner and outer segments occur through this narrow connecting cilium. Ca(2+)-activated centrin isoforms bind to the visual heterotrimeric G-protein transducin via an interaction with the betagamma-subunit. Ca(2+)-dependent assemblies of centrin/G-protein complexes may regulate the transducin mo…

Gene isoformPhotoreceptorsgenetic structuresPhotoreceptor cellHeterotrimeric G proteinConnecting ciliummedicineCentrinBasal bodyAnimalsPhotoreceptor CellsCiliaTransducinPhosphorylationVision OcularCentrosomeRetinaChemistryLight-dependent translocationCiliumCalcium-Binding ProteinsSensory SystemsCell biologyProtein TransportOphthalmologymedicine.anatomical_structureCentrinVertebratesTransducinsense organsPhotic StimulationVision Research
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