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Originally published in Science Express on 5 February 2004
Science 19 March 2004:
Vol. 303. no. 5665, pp. 1831 - 1838
DOI: 10.1126/science.1093087
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Research Articles

Architecture of the Photosynthetic Oxygen-Evolving Center

Kristina N. Ferreira,1* Tina M. Iverson,2* Karim Maghlaoui,1 James Barber,1{dagger} So Iwata1,2,3{dagger}

Photosynthesis uses light energy to drive the oxidation of water at an oxygen-evolving catalytic site within photosystem II (PSII). We report the structure of PSII of the cyanobacterium Thermosynechococcus elongatus at 3.5 angstrom resolution. We have assigned most of the amino acid residues of this 650-kilodalton dimeric multisubunit complex and refined the structure to reveal its molecular architecture. Consequently, we are able to describe details of the binding sites for cofactors and propose a structure of the oxygen-evolving center (OEC). The data strongly suggest that the OEC contains a cubane-like Mn3CaO4 cluster linked to a fourth Mn by a mono-µ-oxo bridge. The details of the surrounding coordination sphere of the metal cluster and the implications for a possible oxygen-evolving mechanism are discussed.

1 Department of Biological Sciences, Imperial College London, London, SW7 2AZ, UK.
2 Division of Biomedical Sciences, Imperial College London, London, SW7 2AZ, UK.
3 ATP System Project, ERATO, Japan Science and Technology Corporation, 5800-3 Nagatsuta, Midori-ku, Yokohama 226-0026, Japan.


* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: s.iwata{at}imperial.ac.uk (S.I.); j.barber{at}imperial.ac.uk (J.B.)

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