Two Interconvertible Structures that Explain the Spectroscopic Properties of 
the Oxygen‐Evolving Complex of Photosystem II in the S2 State

Pantazis, Dimitrios A.; Ames, William; Cox, Nicholas; Lubitz, Wolfgang; Neese, Frank

doi:10.1002/anie.201204705

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Two Interconvertible Structures that Explain the Spectroscopic Properties of the Oxygen‐Evolving Complex of Photosystem II in the S₂ State

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Pantazis, Dimitrios A.
Research Department Neese, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Ames, William
Research Department Neese, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Cox, Nicholas
Research Department Lubitz, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Lubitz, Wolfgang
Research Department Lubitz, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Neese, Frank
Research Department Neese, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Pantazis, D. A., Ames, W., Cox, N., Lubitz, W., & Neese, F. (2012). 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(39), 9935-9940. doi:10.1002/anie.201204705.

Cite as: https://hdl.handle.net/21.11116/0000-0007-3FE8-E

Abstract

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).