Comprehensive Evaluation of Models for Ammonia Binding to the Oxygen Evolving Complex of Photosystem II.

ABSTRACT: The identity and insertion pathway of the substrate oxygen atoms that are coupled to dioxygen by the oxygen-evolving complex (OEC) remains a central question toward understanding Nature's water oxidation mechanism. In several studies, ammonia has been used as a small "water analogue" to elucidate the pathway of substrate access to the OEC and to aid in determining which of the oxygen ligands of the tetramanganese cluster are substrates for O-O bond formation. On the basis of structural and spectroscopic investigations, five first-sphere binding modes of ammonia have been suggested, involving either substitution of an existing H₂O/OH^-/O^2- group or addition as an extra ligand to a metal ion of the Mn₄CaO₅ cluster. Some of these modes, sp

SUBMITTER: Drosou M 

PROVIDER: S-EPMC10875651 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature