Model of the acceptor side of photosystem II core from Howie Robinson (1)
The structure is a model based on use of the bacterial reaction
center as a template.
In the initial view, the protein is oriented with the acceptor side
(stroma facing domain) up, and the donor-side (lumen facing domain) down.
The D1 subunit is colored green (helix D) and orange (helix E), and the D2 subunit blue (helix D) and blue-green (helix E). The chromophores are shown as ball and stick models, colored as follows: pheophytin of D2, green-blue; PQA, yellow; PQB, CPK-colors.