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EPR spectroscopy of the manganese cluster of photosystem II

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Abstract

Electron paramagnetic resonance (EPR) spectroscopy is a valuable tool for understanding the oxidation state and chemical environment of the Mn4Ca cluster of photosystem II. Since the discovery of the multiline signal from the S2 state, EPR spectroscopy has continued to reveal details about the catalytic center of oxygen evolution. At present EPR signals from nearly all of the S-states of the Mn4Ca cluster, as well as from modified and intermediate states, have been observed. This review article describes the various EPR signals obtained from the Mn4Ca cluster, including the metalloradical signals due to interaction of the cluster with a nearby organic radical.

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Abbreviations

CW-EPR:

Continuous wave EPR

ENDOR:

Electron-nuclear double resonance

EPR:

Electron paramagnetic resonance

ESEEM:

Electron spin echo envelop modulation

ESE-ENDOR:

Electron spin echo ENDOR

IR:

Infra-red

OEC:

Oxygen evolving complex

PSII:

Photosystem II

ZFS:

Zero field splitting

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Acknowledgement

I would like to thank Lars-Erik Andréasson, R. David Britt, Johannes Messinger, Vasili Petrouleas, and Kenneth Sauer for permission to reproduce here the excellent examples of classic signals from their earlier work.

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  1. Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC, 27402, USA

    Alice Haddy

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Haddy, A. EPR spectroscopy of the manganese cluster of photosystem II. Photosynth Res 92, 357–368 (2007). https://doi.org/10.1007/s11120-007-9194-9

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  • DOI: https://doi.org/10.1007/s11120-007-9194-9

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