2003
Two Redox-Active β-Carotene Molecules in Photosystem II †
Tracewell C, Brudvig G. Two Redox-Active β-Carotene Molecules in Photosystem II †. Biochemistry 2003, 42: 9127-9136. PMID: 12885246, DOI: 10.1021/bi0345844.Peer-Reviewed Original ResearchMeSH KeywordsAdaptation, PhysiologicalBeta CaroteneCyanobacteriaDarknessElectron Spin Resonance SpectroscopyFree RadicalsFreezingLight-Harvesting Protein ComplexesNormal DistributionOxidation-ReductionPhotochemistryPhotosynthetic Reaction Center Complex ProteinsPhotosystem II Protein ComplexSpectroscopy, Near-InfraredSpinacia oleraceaTyrosineConceptsSecondary electron transfer pathwayElectron transfer pathwayElectron paramagnetic resonance spectroscopyElectron transfer reactionsElectron transfer pathParamagnetic resonance spectroscopyHole-hopping mechanismPS II core complexesΒ-carotene moleculesPS II membranesII core complexesPhotosystem IIIR spectroscopyPS IILow temperatureCharge separationElectrostatic interactionsOxygen evolutionResonance spectroscopyLow-temperature illuminationInhibited samplesSpectroscopyEquilibrated statePeak variesSynechocystis PCC 6803
2000
Assignment of the Q y Absorbance Bands of Photosystem II Chromophores by Low-Temperature Optical Spectroscopy of Wild-Type and Mutant Reaction Centers †
Stewart D, Nixon P, Diner B, Brudvig G. Assignment of the Q y Absorbance Bands of Photosystem II Chromophores by Low-Temperature Optical Spectroscopy of Wild-Type and Mutant Reaction Centers †. Biochemistry 2000, 39: 14583-14594. PMID: 11087414, DOI: 10.1021/bi001246j.Peer-Reviewed Original ResearchMeSH KeywordsBacteriochlorophyllsBenzoquinonesCold TemperatureCyanobacteriaElectron Spin Resonance SpectroscopyFree RadicalsFreezingGlutamineHistidineLight-Harvesting Protein ComplexesMutagenesis, Site-DirectedOxidation-ReductionPhotosynthetic Reaction Center Complex ProteinsPhotosystem II Protein ComplexSpectrophotometryTyrosineConceptsAbsorbance bandPhotosystem IIHydrogen bonding environmentOptical spectroscopyReaction center chromophoresRedox-active cofactorsDouble difference spectraLow temperature optical spectroscopyNumber of chromophoresRedox-active quinonesMutant reaction centersRedox stateRC chromophoresAxial ligandsCryogenic optical spectroscopyChromophore positionProtein environmentPSII preparationsSpectral assignmentsElectrochromic effectAccessory ChlElectronic structureChromophoreChromophore interactionsPhotosynthetic RCs
1985
Electron transfer in photosystem II at cryogenic temperatures.
De Paula J, Innes J, Brudvig G. Electron transfer in photosystem II at cryogenic temperatures. Biochemistry 1985, 24: 8114-20. PMID: 3004575, DOI: 10.1021/bi00348a042.Peer-Reviewed Original ResearchConceptsS2-state multiline EPR signalMultiline EPR signalElectron donationEPR signalS1 stateCytochrome b559Electron paramagnetic resonance spectroscopyParamagnetic resonance spectroscopyStable charge separationPhotosystem IIChemical oxidationChlorophyll cationElectron transferReaction center concentrationCharge separationElectron donorResonance spectroscopyS2 stateReaction centersTemperature rangeP680Signal speciesCenter concentrationB559Donation pathway