Substrate water exchange in the S<sub>2</sub> state of photosystem II is dependent on the conformation of the Mn<sub>4</sub>Ca cluster
Casper de Lichtenberg, Johannes Messinger
Abstract
state is unaffected by Ca/Sr substitution. These findings support that (i) O5 is the slowly exchanging substrate water, with W2 being the only other option, and (ii) either W2 or W3 is the fast exchanging substrate. The three remaining possibilities for O-O bond formation in PSII are discussed.
Topics & Concepts
Oxygen-evolving complexPhotosystem IIChemistryElectron paramagnetic resonanceSubstrate (aquarium)CubaneCluster (spacecraft)Oxygen evolutionWater splittingCatalysisCrystallographyPhotosynthesisPhotochemistryPhysical chemistryNuclear magnetic resonanceCrystal structureComputer scienceProgramming languageOceanographyBiochemistryPhotocatalysisElectrodeElectrochemistryPhysicsGeologyPhotosynthetic Processes and MechanismsMetal-Catalyzed Oxygenation MechanismsSpectroscopy and Quantum Chemical Studies