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