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. Author manuscript; available in PMC: 2021 Aug 30.
Published in final edited form as: Structure. 2021 Mar 22;29(7):743–754.e4. doi: 10.1016/j.str.2021.03.004

Figure 5. Chromophore displacements and D-ring rotations.

Figure 5.

DED is displayed in red and green with contour levels red, 2.7σ (3σ of DED66ms); green, 2.7σ (3σ of DED66ms). EED is shown in blue with Nc = 22

(B) and Nc = 19 (D), contour level 1.5σ.

(A) Overall chromophore configuration in subunit A at the 33-ms time delay. Gray, reference (dark); orange, intermediate at 33 ms. For subunit A the reference structure is gray, the result of the clockwise D-ring rotation light blue, and the fully isomerized structure orange. Chromophore slides in the direction of the red arrows. PW, pyrrole water.

(B) EED (blue), Nc = 22, on the D ring in subunit A, colors as in (A).

(C) Chromophore configuration in subunit B at 5 ns. Positive features β determine the ring positions. Feature βc2 (behind the chromophore plane) is the result of a C-ring tilt resulting in a clockwise rotation of ring D (light-blue structure and blue arrow). Feature βc2 denotes a C-ring tilt forward, which results in a counterclockwise rotation of ring D (pink structure and purple arrow).

(D) EED (blue) on the D ring in subunit B, colors as in (C).