The exchange of the fast substrate water in the S<sub>2</sub> state of photosystem II is limited by diffusion of bulk water through channels – implications for the water oxidation mechanism
Casper de Lichtenberg, Christopher J. Kim, Petko Chernev, Richard J. Debus, Johannes Messinger
Abstract
Access to the oxygen-evolving complex in photosynthesis is restricted by specific barriers in the channels connecting the Mn 4 CaO 5 catalyst with bulk water. Together with other recent data, this finding allows assigning the two substrate waters.
Topics & Concepts
Oxygen-evolving complexPhotosystem IISubstrate (aquarium)PhotosynthesisDiffusionOxygen evolutionMechanism (biology)Chemical physicsChemistryCatalysisOxygenArtificial photosynthesisPhotochemistryEnvironmental scienceEcologyPhysicsPhysical chemistryBiologyPhotocatalysisBiochemistryElectrodeQuantum mechanicsOrganic chemistryThermodynamicsElectrochemistryPhotosynthetic Processes and MechanismsSpectroscopy and Quantum Chemical StudiesPlant Stress Responses and Tolerance