2003
Pulsed High-Frequency EPR Study on the Location of Carotenoid and Chlorophyll Cation Radicals in Photosystem II
Lakshmi K, Poluektov O, Reifler M, Wagner A, Thurnauer M, Brudvig G. Pulsed High-Frequency EPR Study on the Location of Carotenoid and Chlorophyll Cation Radicals in Photosystem II. Journal Of The American Chemical Society 2003, 125: 5005-5014. PMID: 12708850, DOI: 10.1021/ja0295671.Peer-Reviewed Original ResearchMeSH KeywordsBeta CaroteneBinding SitesCationsChlorophyllCyanobacteriaDeuteriumElectron Spin Resonance SpectroscopyFerrous CompoundsFree RadicalsLight-Harvesting Protein ComplexesOxidation-ReductionPhotosynthetic Reaction Center Complex ProteinsPhotosystem II Protein ComplexProtein ConformationRhodospirillumConceptsHigh-frequency EPR spectroscopyRelaxation enhancementEPR spectroscopyRelaxation ratePS IIElectron donorChlorophyll cation radicalsSpin-lattice relaxation rateWater oxidation complexFrequency EPR StudyPigment-protein complexesPhotosystem IIGreater relaxation enhancementCarotenoid-binding siteCation radicalsChlorophyll radicalsElectron transferAlternate electron donorsEPR studiesEPR signalDistance estimatesReaction centersRadicalsSpectroscopy
1997
The Tetranuclear Manganese Cluster in Photosystem II: Location and Magnetic Properties of the S2 State As Determined by Saturation−Recovery EPR Spectroscopy †
Koulougliotis D, Schweitzer R, Brudvig G. The Tetranuclear Manganese Cluster in Photosystem II: Location and Magnetic Properties of the S2 State As Determined by Saturation−Recovery EPR Spectroscopy †. Biochemistry 1997, 36: 9735-9746. PMID: 9245405, DOI: 10.1021/bi970326t.Peer-Reviewed Original ResearchConceptsFirst excited spin stateSpin-lattice relaxationSpin statesMagnetic propertiesExcited spin statesS2-state multiline EPRNuclear spin-lattice relaxationSpin-lattice relaxation propertiesEffective magnetic momentLine shapeUntreated photosystem IIMagnetic momentDifferent spin statesDipolar modelNear resonanceGround spin stateSaturation-recovery EPR spectroscopyNuclear relaxation processesLarmor frequencyOrbach mechanismGreater relaxation enhancementTemperature-dependent enhancementDipole-dipole interactionTetranuclear manganese clusterS2-state multiline EPR signal