1999
Low-Temperature Optical and Resonance Raman Spectra of a Carotenoid Cation Radical in Photosystem II
Vrettos J, Stewart D, de Paula J, Brudvig G. Low-Temperature Optical and Resonance Raman Spectra of a Carotenoid Cation Radical in Photosystem II. The Journal Of Physical Chemistry B 1999, 103: 6403-6406. DOI: 10.1021/jp991464q.Peer-Reviewed Original ResearchCarotenoid cation radicalsCarotenoid cationResonance Raman spectraCation radicalsSecondary electron transfer pathwayRaman spectraFT-Raman spectraPhotosystem II core complexElectron transfer pathwayII core complexesPhotosystem IIReversible photooxidationChemical oxidationCationsLow-temperature illuminationFirst exampleCytochrome b559Absorbance maximumPhotooxidationRadicalsSpectraCore complexPossible natureOxidationSpectrum characteristics
1998
A New Model of Cytochrome B-559 Function Based on the Observation of A Reversible Redox-Linked Interconversion Between Two Redox forms of Cytochrome B-559
Stewart D, Brudvig G. A New Model of Cytochrome B-559 Function Based on the Observation of A Reversible Redox-Linked Interconversion Between Two Redox forms of Cytochrome B-559. 1998, 1113-1116. DOI: 10.1007/978-94-011-3953-3_265.Peer-Reviewed Original ResearchPhotosystem IIRedox formsCyt b559Electron transfer pathwayHigh-potential formLow-potential formPSII samplesMn4 clusterElectron transferCyclic electron transferAlternate electron donorsElectron donorMidpoint potentialSample preparationExtrinsic polypeptidesCytochrome b559Heme environmentB559PhotooxidationP680B-type cytochromeInterconversionPreparation
1997
Fluorescence Quenching by Chlorophyll Cations in Photosystem II †
Schweitzer R, Brudvig G. Fluorescence Quenching by Chlorophyll Cations in Photosystem II †. Biochemistry 1997, 36: 11351-11359. PMID: 9298954, DOI: 10.1021/bi9709203.Peer-Reviewed Original ResearchConceptsFluorescence quenchingPhotosystem IIElectron donorDonor sideElectron paramagnetic resonance spectroscopyRedox-active tyrosinesRedox-active centersCharge-separated stateSteady-state fluorescence quenchingParamagnetic resonance spectroscopyRedox-active componentsElectron donor sideElectron transfer pathwayCytochrome b559Redox stateFluorescence intensityO2-evolving complexPrimary electron donorReversible oxidationChlorophyll cationElectron donationFurther oxidationChlZRapid photooxidationDifferent sample preparation
1992
Photooxidation of cytochrome b559 in oxygen-evolving photosystem II.
Buser C, Diner B, Brudvig G. Photooxidation of cytochrome b559 in oxygen-evolving photosystem II. Biochemistry 1992, 31: 11449-59. PMID: 1445880, DOI: 10.1021/bi00161a025.Peer-Reviewed Original ResearchConceptsCyt b559Photosystem II protein complexDark reductionOptical spectroscopyElectron transfer kineticsOxygen-evolving photosystem IIPSII-enriched membranesCytochrome b559Redox stateS2QA- charge recombinationExtent of photooxidationRate of photooxidationPrimary electron acceptorPH range 5.0Plastoquinone poolPSII samplesAcidic pH valuesRoom temperatureElectron acceptorPhotosystem IIPhotooxidationRate of reductionRedox equilibriumRange 5.0P680
1990
Electron-transfer reactions in manganese-depleted photosystem II.
Buser C, Thompson L, Diner B, Brudvig G. Electron-transfer reactions in manganese-depleted photosystem II. Biochemistry 1990, 29: 8977-85. PMID: 2176840, DOI: 10.1021/bi00490a014.Peer-Reviewed Original ResearchConceptsMn-depleted photosystem II membranesElectron donation reactionsManganese-depleted photosystem IIElectron donationCytochrome b559Photosystem II membranesElectron paramagnetic resonance spectroscopyGlobal fitPSII samplesParamagnetic resonance spectroscopyEnergy differenceP680Room temperaturePhotosystem IIElectron transfer reactionsTime scalesLifetimeDecayFree energy differenceElectron transferRate constantsB559Resonance spectroscopySame orderRate of photooxidation
1989
Characterization of the multiple forms of cytochrome b559 in photosystem II.
Thompson L, Miller A, Buser C, de Paula J, Brudvig G. Characterization of the multiple forms of cytochrome b559 in photosystem II. Biochemistry 1989, 28: 8048-56. PMID: 2557895, DOI: 10.1021/bi00446a012.Peer-Reviewed Original ResearchConceptsCytochrome b559PSII membranesPhotosystem II protein complexUntreated PSII membranesExtrinsic polypeptidesLow-temperature photooxidationMn complexesPSII samplesEPR spectroscopyLigand fieldRedox titrationRedox formsEPR signalPhotosystem IIB559ComplexesThylakoid membranesPhotooxidationSpectroscopyProtein complexesUnique abilityMembraneTitrationConformationRemoval
1986
Differential scanning calorimetric studies of photosystem II: evidence for a structural role for cytochrome b559 in the oxygen-evolving complex.
Thompson L, Sturtevant J, Brudvig G. Differential scanning calorimetric studies of photosystem II: evidence for a structural role for cytochrome b559 in the oxygen-evolving complex. Biochemistry 1986, 25: 6161-9. PMID: 3790512, DOI: 10.1021/bi00368a050.Peer-Reviewed Original ResearchConceptsOxygen-evolving complexDifferential scanning calorimetryCytochrome b559Oxygen evolution activityPeak A2Photosystem IIDifferential scanning calorimetric studiesOxidation stateRelative peak areasScanning calorimetric studiesEvolution activityDSC studiesScanning calorimetryDSC tracesPeak areaC temperature rangeDegrees C temperature rangeEndothermic transitionLight-harvesting chlorophyllLow temperature shoulderDSC peakNew probeCalorimetric studiesB559PS IIEffect of the 17- and 23-kilodalton polypeptides, calcium, and chloride on electron transfer in photosystem II.
De Paula J, Li P, Miller A, Wu B, Brudvig G. Effect of the 17- and 23-kilodalton polypeptides, calcium, and chloride on electron transfer in photosystem II. Biochemistry 1986, 25: 6487-94. PMID: 3024710, DOI: 10.1021/bi00369a022.Peer-Reviewed Original ResearchConceptsS2-state multiline EPR signalMultiline EPR signalEPR signalPSII membranesPhotosystem II samplesS1 stateUntreated PSII membranesReaction centersElectron paramagnetic resonance measurementsChlorophyll moleculesPhotosystem II membranesStable charge separationParamagnetic resonance measurementsPhotosystem IIPSII samplesO2-evolving centerElectron transferCharge separationElectron donorNuclear hyperfine structureCytochrome b559Mn sitesResonance measurementsOxidationFraction of PSII
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