Extended Data Fig. 1: Overview of the PSII structure and electron density maps of the 3F state.
From: Structures of the intermediates of Kok’s photosynthetic water oxidation clock
a, Structure of the native PSII homodimer. In the left monomer the location of cofactors for the initial charge separation (P680, PheoD1), and for the electron transfer leading to the reduction of the plastoquinone (QA, QB) at the acceptor side and to the oxidation of the OEC at the donor side by P680+ are indicated. In the right monomer, the locations of the protein subunits are displayed. b–d, 2mFobs − DFcalc map (blue, 1.5σ contour) obtained from the room temperature 3F data set. b, Density around the main chain and a chlorophyll. c, Well-resolved ordered water molecules. d, Chlorophyll and pheophytin molecules with well-resolved tails. e, Clear density in hydrophobic regions and along cofactor hydrocarbon tails.
