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1s5l

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Image:1s5l.gif

Architecture of the photosynthetic oxygen evolving center

Overview

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-micro-oxo bridge. The details of the surrounding coordination, sphere of the metal cluster and the implications for a possible, oxygen-evolving mechanism are discussed.

About this Structure

1S5L is a Protein complex structure of sequences from Thermosynechococcus elongatus with FE, BCT, OEC, CL1, PHO, HEM, PL9, LMT and BCR as ligands. The following page contains interesting information on the relation of 1S5L with [Photosystem II]. Full crystallographic information is available from OCA.

Reference

Architecture of the photosynthetic oxygen-evolving center., Ferreira KN, Iverson TM, Maghlaoui K, Barber J, Iwata S, Science. 2004 Mar 19;303(5665):1831-8. Epub 2004 Feb 5. PMID:14764885

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