Spectroscopy, Fourier Transform InfraredSynechocystisRhodobacter sphaeroidesPhotosystem II Protein ComplexPhotosynthetic Reaction Center Complex ProteinsOxidation-ReductionSpectrophotometrySpectrophotometry, UltravioletModels, MolecularProtein ConformationElectron TransportLightManganeseBinding SitesPhotosystem I Protein ComplexSpectrophotometry, InfraredAmino Acid SequenceKineticsCytochromesMolecular Sequence DataProtein BindingHydrogen BondingSpectrum AnalysisProtein Structure, SecondaryCircular DichroismPhotochemistryMutagenesis, Site-DirectedProteinsBacteriorhodopsinsModels, ChemicalCarbon MonoxideElectron Transport Complex IVStructure-Activity RelationshipThermodynamicsCrystallography, X-RaySpectrum Analysis, RamanSequence Analysis, ProteinMolecular StructureMagnetic Resonance SpectroscopyHydrogen-Ion ConcentrationDatabases, ProteinAmino Acid SubstitutionProtein Structure, TertiaryPhotolysisHemeAmino AcidsMutationSolvents