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Figure 5
Structures of PSII in the S1 (gray) and S2 states (colored) superimposed with an isomorphous difference Fourier map showing (a) the overall PSII structure, and the regions of the (b) O4 channel, (c) OEC and (d) QB site. The difference Fourier map was contoured at ±4σ (a)–(c) and ±3σ (d) in the same color as those in Fig. 3[link]. The surface area where the minor structural changes are distributed is indicated by a blue dashed line. Hydrogen-bonded networks of water molecules are represented by black dotted lines, and the structural changes are indicated by black arrows. W665 is encircled with a red dashed line in (b).

IUCrJ
Volume 8| Part 3| May 2021| Pages 431-443
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521002177