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Characterization of the Mn Site in the Photosynthetic Oxygen Evolving Complex: The Effect of Hydroxylamine and Hydroquinone on the X-ray Absorption Spectra

X-ray absorption spectroscopy has been used to characterize the Mn site in the photosynthetic oxygen evolving complex (OEC) reaction center core complex. Treatment in the dark with hydroxylamine or with dihydroquinone results in a shift of the XANES spectra to lower energy, consistent with reduction at the Mn site. Structural changes are seen in the EXAFS as well. In both cases, the structural changes are completely reversible on illumination.