Structure of the intact C2S2-type Photosystem II-LHCII supercomplex from Arabidopsis thaliana at 2.44 Å
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Photosystem II (PSII) is a large membrane-bound protein complex that is essential for oxygenic photosynthesis in plants and cyanobacteria. While there are several high-resolution structures of PS II from cyanobacteria, very few PS II structures have been reported from higher plants. Here, we present the first high-resolution structure of an intact and active PS II from Arabidopsis thaliana at a resolution of 2.44 Å, which to date represents the highest resolution structure of PS II from any land plant. The improved resolution allowed for the modeling of cofactors which have not been previously seen in higher plant PS II structures. Importantly, we were able to identify many water molecules within the PS II structure, including waters around the water-splitting manganese cluster, in the bottleneck regions of the water/proton channels, and near the non-heme iron on the acceptor side. Structural differences between cyanobacterial and plant PS II are discussed.
