NH3 Binding to the S2 State of the O2-Evolving Complex of Photosystem II: Analogue to H2O Binding during the S2 → S3 Transition.

Supporting Information for: NH3 Binding to the S2 State of the O2-Evolving Complex of Photosystem II: Analog to H2O binding during the S2→S3 Transition

FTIR detection of water reactions in the oxygen-evolving centre of photosystem II.

Flash-induced Fourier transform infrared (FTIR) difference spectroscopy has been used to study the water-oxidizing reactions in the oxygen-evolving centre of photosystem II. Reactions of water molecules were directly monitored by detecting the OH stretching bands of weakly H-bonded OH of water in the 3700-3500 cm(-1) region in FTIR difference spectra during S-state cycling. In the S1-->S2 trans...

A Simulation of the Isotropic EXAFS Spectra for the S2 and S3 Structures of the Oxygen Evolving Complex in Photosystem II

Most of the main features of water oxidation in photosystem II are now quite well understood, including the mechanism for O-O bond formation. For the intermediate S2 and S3 structures there is also nearly complete agreement between theory and experiments. Given the present high degree of consensus between theory and spectroscopic experiments for these structures, it is of high interest to go ba...

Simulation of the isotropic EXAFS spectra for the S2 and S3 structures of the oxygen evolving complex in photosystem II.

Most of the main features of water oxidation in photosystem II are now well understood, including the mechanism for O-O bond formation. For the intermediate S2 and S3 structures there is also nearly complete agreement between quantum chemical modeling and experiments. Given the present high degree of consensus for these structures, it is of high interest to go back to previous suggestions conce...

Oxidation states of the manganese cluster during the flash-induced S-state cycle of the photosynthetic oxygen-evolving complex.

The Mn K-edge x-ray absorption spectra for the pure S states of the tetranuclear Mn cluster of the oxygen-evolving complex of photosystem II during flash-induced S-state cycling have been determined. The relative S-state populations in samples given 0, 1, 2, 3, 4, or 5 flashes were determined from fitting the flash-induced electron paramagnetic resonance (EPR) multiline signal oscillation patte...