6533b7d1fe1ef96bd125c273

RESEARCH PRODUCT

Calcium-Dependent Assembly of Centrin-G-Protein Complex in Photoreceptor Cells

Hui-woog ChoeHui-woog ChoeKlaus Peter HofmannMartin HeckOliver P. ErnstAngelika SchmittAlexander PulvermüllerRalf WottrichAndreas GießlUwe Wolfrum

subject

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 Transduction

description

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 mediated by the betagamma-complex. The Ca(2+)-dependent assembly of a G protein with centrin is a novel aspect of the supply of signaling proteins in sensory cells and a potential link between molecular translocations and signal transduction in general.

yearjournalcountryeditionlanguage
2002-04-01Molecular and Cellular Biology
https://doi.org/10.1128/mcb.22.7.2194-2203.2002