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RESEARCH PRODUCT
Insights into functional aspects of centrins from the structure of N-terminally extended mouse centrin 1
Patrick ScheererUwe WolfrumSebastian RauschKlaus Peter HofmannHui-woog ChoeHui-woog ChoeJung Hee ParkAndreas GießlNorbert KraussWolfgang HöhneOliver P. ErnstAlexander Pulvermüllersubject
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 Bindingdescription
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) resembles the overall structure of troponin C in its two Ca2+ bound form. Within the N-terminal extension in MmCen1-L, residues W24 and R25 bind to the C-terminal domain of centrin 1 in a target-protein-like geometry. Here, we discuss this binding mode in connection with putative interaction sites of the target-protein transducin and the self-assembly of centrins.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-12-01 | Vision Research |