Fig. 2: mFobs − DFcalc electron density omit map of key components of the redox active donor site of PS II at five time points along the S3→S0 transition as well as the S3 and S0 states.
From: Structural evidence for intermediates during O2 formation in photosystem II
a, Residues D1-Y161 (Yz) and D1-H190. The omit map from the S3 state reference is shown in light brown for comparison with the time point data (blue). b, A simplified representation of the structural changes observed at the Yz region. c, Omit density of atoms O5 and Ox of the OEC. d, Omit density of atoms O5 and the terminal water ligands W1, W2, W3 and W4 of the OEC. e, Omit density of carboxylate oxygen atoms of D1-E189 and D1-D170. All omit maps shown in a and c–e were generated by omitting the atom or residue of interest individually, and only the primary component (that is, the state that is advancing to S0) was used. Notable features are highlighted with red arrows and black dashed circle. All omit maps shown are contoured at 2.5σ, 3σ and 4σ using the colour scheme annotated in d for easier visualization. See also Supplementary Information Video 1.
