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Dr. Dimitrios A. Pantazis, Dr. William Ames, Dr. Nicholas Cox, Prof. Dr. Wolfgang Lubitz and Prof. Dr. Frank Neese Two Interconvertible Structures that Explain the Spectroscopic Properties of the Oxygen-Evolving Complex of Photosystem II in the S2 State Angewandte Chemie International Edition 51

Version of Record online: 21 AUG 2012 | DOI: 10.1002/anie.201204705

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Using models derived from the X-ray structure of photosystem II, it is shown that the oxygen evolving complex in the S2 state exists in two energetically similar and interconvertible forms. A longstanding question regarding the spectroscopy of the catalyst is thus answered: one form corresponds to the multiline g=2.0 EPR signal (see picture, right; O red, Mn purple, Ca yellow), and the other to the g≥4.1 signals (left).

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