2024
Electron Transfer Dynamics at Dye-Sensitized SnO2/TiO2 Core/Shell Electrodes in Aqueous/Nonaqueous Electrolyte Mixtures
Xiao L, Spies J, Sheehan C, Zeng Z, Gao Y, Gao T, Ehrlacher A, Zuerch M, Brudvig G, Mallouk T. Electron Transfer Dynamics at Dye-Sensitized SnO2/TiO2 Core/Shell Electrodes in Aqueous/Nonaqueous Electrolyte Mixtures. Journal Of The American Chemical Society 2024, 146: 18117-18127. PMID: 38900942, DOI: 10.1021/jacs.4c05187.Peer-Reviewed Original ResearchFlat band potentialOptical-pump terahertz-probe spectroscopyTransient absorption spectroscopyCore/shell electrodesSolvent electrolytesElectron transferElectron injectionBand potentialDynamics of photoinduced electron transferNanosecond transient absorption spectroscopyNegative flat band potentialSemiconductor flat-band potentialDye-sensitized photoanodeOxidized dye moleculesPhotoinduced electron injectionPhotoinduced electron transferElectron transfer dynamicsElectron injection efficiencySlow electron transferInjection efficiencyIncreasing acetonitrile concentrationConcentration of acetonitrileIncreasing concentrations of acetonitrileConduction band electronsCharge separation
2023
Two-Dimensional Electronic Spectroscopy of the Far-Red-Light Photosystem II Reaction Center
Silori Y, Willow R, Nguyen H, Shen G, Song Y, Gisriel C, Brudvig G, Bryant D, Ogilvie J. Two-Dimensional Electronic Spectroscopy of the Far-Red-Light Photosystem II Reaction Center. The Journal Of Physical Chemistry Letters 2023, 14: 10300-10308. PMID: 37943008, DOI: 10.1021/acs.jpclett.3c02604.Peer-Reviewed Original ResearchTwo-dimensional electronic spectroscopyCharge separation mechanismPhotosystem II reaction centerElectronic spectroscopyPrimary charge separationReaction centersSpectral congestionPrimary energy conversionCharge separationVisible lightFar-red lightRadical pairSpectral overlapPrimary electron acceptorConstituent pigmentsFAR-REDSpectroscopyLightEnergy conversionSeparation mechanismElectron acceptor
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
2002
Structure-Based Kinetic Modeling of Excited-State Transfer and Trapping in Histidine-Tagged Photosystem II Core Complexes from Synechocystis †
Vassiliev S, Lee C, Brudvig G, Bruce D. Structure-Based Kinetic Modeling of Excited-State Transfer and Trapping in Histidine-Tagged Photosystem II Core Complexes from Synechocystis †. Biochemistry 2002, 41: 12236-12243. PMID: 12356326, DOI: 10.1021/bi0262597.Peer-Reviewed Original ResearchConceptsPSII core complexesFluorescence decay kineticsCharge separationRadical pairPhotosystem IIKinetic modelPhotosystem II core complexReaction centersFluorescence decayDecay kineticsII core complexesExcited-state dynamicsExcitation energy transferPrimary radical pairEnergy levelsStatic disorder modelElectron transferCharge stabilizationEnergy level modelExcited-state transferPSII preparationsStructure-based kinetic modelCore complexExponential decay componentsSimple kinetic model
2000
Low-Temperature Turnover Control of Photosystem II Using Novel Metal-Containing Redox-Active Herbicides
Karki L, Lakshmi K, Szalai V, Brudvig G. Low-Temperature Turnover Control of Photosystem II Using Novel Metal-Containing Redox-Active Herbicides. Journal Of The American Chemical Society 2000, 122: 5180-5188. DOI: 10.1021/ja994138x.Peer-Reviewed Original ResearchO2-evolving complexQB siteLong-range electron transferElectron acceptor groupsS-state cyclingStable charge separationPentane spacerHydrocarbon spacerUrea groupsElectron transferCharge separationEPR resultsStoichiometric reductionTwo-electronHerbicide derivativesEPR studiesElectron acceptorMoietyPhenylurea herbicidesDonor sidePhotosystem IISpacerComplexesLow temperatureInhibition studies
1987
Reactions of hydroxylamine with the electron-donor side of photosystem II.
Beck W, Brudvig G. Reactions of hydroxylamine with the electron-donor side of photosystem II. Biochemistry 1987, 26: 8285-95. PMID: 2831941, DOI: 10.1021/bi00399a040.Peer-Reviewed Original ResearchConceptsReaction of hydroxylamineMn complexesElectron donor sideO2-evolving centerCharge separationPSII membranesLow-temperature electron paramagnetic resonance (EPR) spectroscopyPhotosystem IIElectron paramagnetic resonance spectroscopyS2-state multiline EPR signalS1 stateTwo-electron reductionOne-electron photooxidationParamagnetic resonance spectroscopyN-methyl-substituted analoguesRadical oxidation productsO2 evolution activityMultiline EPR signalOxidation stateThylakoid membrane preparationsOxidation productsEvolution activityProlonged dark incubationEPR signalResonance spectroscopyFormation of the S2 state and structure of the Mn complex in photosystem II lacking the extrinsic 33 kilodalton polypeptide
Miller A, de Paula J, Brudvig G. Formation of the S2 state and structure of the Mn complex in photosystem II lacking the extrinsic 33 kilodalton polypeptide. Photosynthesis Research 1987, 12: 205-218. PMID: 24435688, DOI: 10.1007/bf00055121.Peer-Reviewed Original ResearchS2-state multiline EPR signalState multiline EPR signalStable charge separationPSII membranesMultiline EPR signalEPR signalCharge separationManganese sitesElectron paramagnetic resonance spectroscopyUntreated PSII membranesElectron transfer eventsParamagnetic resonance spectroscopyPhotosystem II membranesMn complexesElectron donorResonance spectroscopyS2 stateReaction centersExtrinsic polypeptidesHigh yieldsMagnetic propertiesPhotosystem IISeparationTemperature rangeSpectroscopy
1986
Effect 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